Victor De Araujo - Academia.edu (original) (raw)

Papers by Victor De Araujo

Nexo Revista Científica, 2024

Numerous woods still require a detailed evaluation to understand structural potential. Spotted gu... more Numerous woods still require a detailed evaluation to understand structural potential. Spotted gum solid wood is among such species in which knowledge of its properties for construction is also required. The present study examined 16 physical-mechanical properties of the spotted gum wood (Corymbia maculata) to promote its use in the production of more sustainable bio-based buildings. Using the Brazilian NBR7190 standard code, two stable levels of moisture content were evaluated to figure out the wood behavior, the first at the 30 % saturation point and the second at the standardized dry point at 12 %. 13 spotted gum trees with different ages were collected from different plantations in Brazil to obtain samples from their trunks. Thus, 1959 determinations were analyzed to evaluate results from t-test at 5 % level of significance. From our significant, statistical, and comparative analyses, it was confirmed that spotted gum is suitable for structural uses, being a potential wood in tropical and subtropical regions of Latin America.

Polymers, 2024

Particleboards have gained attention in the global market. Understanding their physical–mechanica... more Particleboards have gained attention in the global market. Understanding their physical–mechanical behavior in the current technological context is essential due to adhesive polymerization, which depends on variables such as pressing time and temperature. Today, the use of nanoparticles has become a plausible option for improving the properties of polymers used in wood-based composites. This study evaluates the influences of the addition of non-commercial 0.5% aluminum oxide (Al₂O₃) and oxide copper (CuO) nanoparticles using a greener route with a lower environmental impact obtaining a urea-formaldehyde (UF)-based polymeric adhesive to manufacture particle composites of Eucalyptus urophylla var. grandis wood. Regarding characterizations, the resin properties analyzed were viscosity, gel time, and pH, as well as panel properties, including density, moisture content, thickness swelling, modulus of elasticity, modulus of rupture, and thermal conductivity. The results were compared with scientific publications and standards. The addition of nanoparticles interfered with viscosity, and all treatments indicated a basic pH. It was not possible to determine the gel time after 10 min. Nanoparticles added to the polymers in the internal layer did not cause an improvement in the swelling properties in terms of thickness, with no significant statistical difference for density and moisture content. The increase from 150 °C to 180 °C may have caused an improvement in all physical–mechanical properties, indicating that the higher temperature positively influenced the polymerization of the formaldehyde-based adhesive. Therefore, the additions of both nanoparticles (0.5% in each condition) led to a limitation in the material influence with respect to physical–mechanical performance.

Caderno Pedagógico, 2024

For the elaboration of projects on timber structures, the Brazilian standard (ABNT, in Portuguese... more For the elaboration of projects on timber structures, the Brazilian standard (ABNT, in Portuguese Associação Brasileira de Normas Técnicas) 7190 (ABNT 1997) ensures the correct application of physical-mechanical properties according to strength classes of lignocellulosic materials. This procedure eliminates the need for botanical identification of woods, since these strength classes support the efficient utilization of a wide range of woody varieties available in Brazil. Due to high mechanical resistances, the hardwoods are usually applied for structural projects of timber construction. This Brazilian standard document prescribes four strength classes (C20, C30, C40 and C60) for these woods, which are determined by characteristic value from the compressive strength parallel to the grain (fc0,k). But, these classes were obtained from experimental outcomes using a few wood varieties. The reorganization of strength classes should result in the best use of mechanical potentials of woods since the updating of these categories leads to the optimization of structural projects for timber construction in order to reposition this biomaterial at even more competitive levels. In this context, the present study aims to verify the current strength classes of hardwoods and if they lead to a good allocation of the fc0,k characteristic values. Otherwise, new strength classes can be determined for better allocations for efficient structural uses. As a result, 56 hardwoods were considered using 672 experimental determinations. Statistically, the current categories can lead to 12,5 % of incorrectly allocated values. The inclusion of C50 and C70 classes allow greater representation for these categories, in order to optimize the use of the hardwoods given the new strength classes. These findings ought to support future revisions of this Brazilian standard document.

Forests, 2024

Bamboo is already a convenient construction resource, as it offers an efficient structural perfor... more Bamboo is already a convenient construction resource, as it offers an efficient structural performance. As this plant has native varieties adapted to different climates and soils of Brazil, bamboo silviculture can be intensified to supply the national industry. Three bamboo species from
Brazil (Dendrocalamus asper, Bambusa tuldoides, and Phyllostachys aurea) were analyzed for the flexural load capacity applied on the internal and external surfaces. Specimens were prepared without knots and with knots centered at the middle of each sample. In total, 240 samples were tested in terms of static bending and dynamic bending (impact). The results showed a higher flexural elasticity and a higher proportional limit strength of knotted P. aurea. The presence of knots provided higher values of ultimate strength in P. aurea, even reducing the bamboo flexibility. Also, P. aurea exhibited the best characteristic of flexural dynamic energy absorption among the three bamboo species under evaluation.

Journal of Cleaner Production, 2024

Considering the significant demands for construction products and the increasing disposals of pla... more Considering the significant demands for construction products and the increasing disposals of plastic and agroforestry residues, this research evaluated the influence of recycled particles of polyethylene terephthalate (PET) inserted in the manufacture of five particleboard prototypes based on Pinus elliottii wood and castor-oil-based polyurethane resin (CPUR). The following panel traits were obtained: 100% pine wood, 0% PET and 10% CPUR (M100P-0PET-10C); 70% pine, 30% PET, and 10% CPUR (M70P-30PET-10C); 50% pine, 50% PET, and 10% CPUR (M50P-50PET-10C); 70% pine, 30% PET, and 5% CPUR (M70P-30PET-5C); and, 50% pine, 50% PET, and 5% CPUR (M50P-50PET-5C). Panels were evaluated according to physical (density, moisture content, thickness swelling, and water absorption), mechanical (modulus of rupture, modulus of elasticity, perpendicular tensile), and morphological tests (scanning electron microscope). M50P-50PET-10C particleboards revealed the best performance in the physical and mechanical tests, as well as M70P-30PET-10C and M50P-50PET-5C panels showed equivalent results. The findings suggested a notable environmental contribution and a great economic feasibility. Thus, it is possible to obtain wood-based particleboards manufactured from recycled PET, reusing this highly discarded non-biodegradable plastic and using a smaller volume of adhesive, with physical-mechanical properties that meet the expected performance for this bioresource-based product.

Revista Principia, 2024

This paper evaluated the participation of the Brazilian timber house producers in technical and s... more This paper evaluated the participation of the Brazilian timber house producers in technical and scientificevents related to their activities, whose fields include products, manufactures and technologies of timber andforest resources for construction. This present study utilized semi structured face-to-face interview method toevaluate the participation of these entrepreneurs in the domestic sphere. Qualitative data were randomlycollected, quantitatively measured and compared to each other. Half of sector formed by two hundreds ofcompanies was evaluated, which resulted in an ideal margin of error. Searches on websites of events relatedto this sector, bibliographic searches, and direct observations in loco of both authors in these events servedto triangulate the data. Entrepreneur declarations were confirmed from the authors’ perceptions as eventparticipants. Two thirds of the sampled companies attend events, especially technical presentations andexhibitions as hearer. A fourth of the sector already attends scientific events, which suggests a search fortrends and innovations. Ergo, the increase in business participation may establish discussions to value theirproducts, that is, their timber housing solutions.

Cadernos Pedagógicos, 2024

Diante da busca por materiais mais sustentáveis, os produtos de madeira engenheirada surgem como ... more Diante da busca por materiais mais sustentáveis, os produtos de madeira engenheirada surgem como uma alternativa para a construção de edifícios. O Cross Laminated Timber (CLT) se destaca por sua leveza, resistência e a capacidade de dissipação de energia advinda de cargas de vento e sísmicas. Essas propriedades caracterizam o CLT como um material de elevado potencial para aplicações em zonas sísmicas. Nesse sentido, tendo em vista a importância da condução de estudos experimentais a fim de avaliar o desempenho de estruturas CLT resistente à sismos, o presente trabalho teve por objetivo a realização de uma revisão sistemática da literatura acerca dos estudos experimentais em paredes de cisalhamento e oscilantes de CLT convencionais. Para isso, foi realizada uma revisão sistemática da literatura a partir de duas bases de dados: Scopus e Web of Science. Identificou-se, nos últimos anos, um aumento no número de estudos relacionados ao tema. Além disso, observou-se que são necessários mais estudos acerca de paredes de cisalhamento do tipo balão a fim de validar os poucos estudos existentes e contribuir para a compreensão acerca de seu comportamento. Adicionalmente, observou-se que os protocolos de carregamento utilizados foram as normativas ASTM E2126 (2011), EN 12512 (2005), ISO 22452 (2011), EN 594 (2011) e a ACI ITG-5.1-07 (2008). O protocolo de carregamento CUREE foi o mais utilizado, abrangendo 36% dos estudos. Dessa forma, a normativa ASTM E2126 (2011) foi a mais empregada na realização dos testes cíclicos em paredes de cisalhamento de CLT. Tendo em vista que essas normativas não foram desenvolvidas especificamente para paredes CLT, torna-se crucial a condução de mais estudos experimentais para respaldar a elaboração de protocolos de teste específicos destinados a paredes de cisalhamento CLT.

Caderno Pedagógico Revista Caderno Pedagógico This journal doesn’t have a profile on ResearchGate yet. Interested in this journal? Get notified when it activates its profile, and start getting updates. I'm interested , 2024

Wood is an anisotropic material and its exposure to carbonization leads to reduced humidity and i... more Wood is an anisotropic material and its exposure to carbonization leads to reduced humidity and increased deformation due to the loss of its aesthetic and functional profile. Moisture may be an explanatory factor for the damage caused to the surface region of the coal. For this work, they were defined according to a basic density gradient, that is, involving species of low, medium and high densities, native and exotic, hardwood and conifers, as well as commercial and non-commercial uses. Among the species selected were: (Qualea sp.) Mandioqueira, (Aspidosperma sp.) Peroba, (Erisma uncinatum) Cedrinho, (Pinus elliotii) Pinus, (Eucalyptus.sp) Eucalipto, (Araucaria angustifolia) Pinheiro do Paraná, (Couratari sp.) Tauari, (Dipteryx sp.) Cumaru, (Tabebuia sp.) Ipê, (Peltogyne sp.) Roxinho, (Apuleia leiocarpa) Garapeira, (Goupia glabra) Cupiúba, (Astronium lecointei) Muiracatiara, (Hevea brasiliensis) Seringueira and (Schizolobium parahyba) Guapuruvu. At temperatures of 400 ºC, damage occurred in all species, with the influence of the temperature applied on the degradation suffered in the samples studied. The images produced can contribute to the understanding of charcoal as a material in its various temperature passages and thermal processes, in addition to analyzing the anatomy of charred samples, using the terms: ruptures and fissures as damage to charred wood as parameters.

Advances in Forestry Science, 2023

Light-woodframe emerges as a modern construction solution to compete with the masonry houses, due... more Light-woodframe emerges as a modern construction solution to compete with the masonry houses, due to similarities in competitive costs and low-trained labor. This informality contributes to troubles and problems, being identified as perceptible challenges for the building planning and management. A good tool to solve these difficulties consists in the use of a standard checklist during construction process activities, avoiding the negligence of necessary steps to complete the building project. This checklist indicates the systemic view of the complete process, acting as a facilitating and standardizing tool for the progress of on-site building works. To meet these demands, the present paper developed and proposed an organizational tool, materialized by a checklist presented in Appendix section of this paper, in order to monitor the construction process of wood-based houses through light-woodframe system. Due to detailed knowledge of each building phase, this user-friendly checklist adds values and offers organization routines for developers and suppliers. Printed checklists exclude the need of electronic devices on site, allowing copies for all workers. On building site, it allows controlling the systematization and progress of activities, providing a comprehensive systemic view of the work.

BioResources, 2023

As a biodegradable material, wood is subject to deterioration if proper conservation techniques a... more As a biodegradable material, wood is subject to deterioration if proper conservation techniques are not observed. Thus, several buildings, especially those of historical heritage, present pathological manifestations that can cause accidents. The interventions in these constructions must be planned to maintain the original elements and the aesthetics of the environment, with the indication of fixing additional elements in the degraded structure. The modification of the section of structural elements is commonly observed in the literature; however, few studies have been intended to analyze the effects of reinforcement in these geometrically discontinuous elements. Furthermore, the use of screwed steel plates guarantees greater ease of execution, even though it is not yet a method that has been well explored in the scientific literature. The objective of this study was to propose an equation for estimating the flexural stiffness of wooden beams with loss of cross-section that are then reinforced with screwed steel plates using a regression model. The considered variables correlated the elastic modulus of the wood and the reinforcement, the configuration of the defect, and the reinforcement. It was possible to identify that the properties of the wood and the position of the defect were variables with a significant impact on the stiffness of the reinforced beam.

Buildings, 2023

Codes of practices and standards for products and activities are available regulations for global... more Codes of practices and standards for products and activities are available regulations for global sectors, although they are dedicated to national scopes such as civil construction in Brazil. These regulations align with industry compliance as they establish mandatory or voluntary issues. Brazilian developers must properly regard construction regulations, which mostly dedicated to concrete and steel buildings but rarely to timber buildings. Through construction regulations, the production of timber buildings can become more standardized and scalable to ensure the steady quality of finished products. From this perspective, this paper evaluated Brazil’s timber housing production sector’s utilization and access to procedures, standards, guidelines, certifications, and seals. A standardized questionnaire was designed and refined to analyze this local perspective. Face-to-face interviews with sampled companies were conducted using a randomized sampling procedure. The margin of error was obtained using significant sampling of this sector. The findings evinced that most Brazilian developers underuse timber building regulations in their production and management practices and still need to familiarize themselves with this important subject. The codes must establish requirements for each timber construction technique to represent different technologies and also specify particularities and added performances to suit varied projects.

Agrarian Academic Journal, 2023

Activated charcoal is a product based on bio-based materials and residues with specific porosity ... more Activated charcoal is a product based on bio-based materials and residues with specific porosity to act as a filtering compound, both to remove color and impurities of liquids. They are produced from physical and/or chemical process, after carbonization, through the activation of molecules. The present paper aims to identify the current perspectives and characteristics of activated charcoals and, sequentially, compare the potential of bamboo and açaí plants to treat contaminants in water. Thus, different positive characteristics were identified for both bio-based resources. Bamboo and açaí can be economically and technically viable materials to be converted into activated charcoal as a way to mitigate the environmental impacts on the water.

Hábitat Sustentable, 2023

Timber housing is a sustainable bioresource-based alternative to traditional construction with ma... more Timber housing is a sustainable bioresource-based alternative to traditional construction with masonry and steel, and recent studies have shown that this sector in Brazil has hundreds of timber housing SMEs. This exploratory study, while analyzing this population, evaluated the profiles available on Instagram®, observing their business strategies and what they have disclosed to clients on sustainability benefits and issues. All the available corporate profiles were surveyed, and a significant
sample of about 80% of a sector was compiled, from a market currently formed by over 400 companies. However, about 70% of these Brazilian companies still do not adequately explore sustainability issues in their timber housing products and service, evidencing an incipient scenario. Moreover, there is a clear opportunity to leverage the arguments posted on their Instagram® profiles as an affirmative awareness strategy. Although some justifications were suggested to convince domestic customers to consider timber housing, this virtual market has a lot of room for improvement.

Revista Árvore, 2023

To simplify the characterization of wood species, the Brazilian standard document ABNT NBR 7190-1... more To simplify the characterization of wood species, the Brazilian standard document ABNT NBR 7190-1 (2022) establishes the determination of mechanical properties employing the characteristic strength in the compression parallel to grain (f c0,k). This mechanical property is estimated using the linear relation given by the following expression f v0,k = 0.12•f c0,k. Brazilian and European standard documents support the estimation of f v0,k using relations among properties. However, the European guidelines in the EN 384 (2019) have used the conventional characteristic strength in the static bending test (f M,k). Thus, this study aimed to investigate the efficiency of the ratio f v0,k = 0.12•f c0,k for adopting 30 hardwoods. The variance analysis results demonstrate the divergence among the experimental outcomes and those values estimated using the relation cited. Therefore, regression models at two parameters were considered to obtain more accurate estimates of f v0,k by adopting f c0,k , and f M,k as independent variables. Regarding the results, the geometric (R 2 = 80.80%) and linear (R² = 74.19%) models were the most accurate for the estimates of f v0,k in terms of f c0,k , and f M,k , respectively. This fact evinces the good accuracy of the models under consideration, which may provide a more rigorous structural design compared to the correlation currently prescribed by the ABNT NBR 7190-1 (2022).

Journal of Materials Research and Technology, 2023

This study aimed to determine the longitudinal-radial (LR) and longitudinal-tangential (LT) shear... more This study aimed to determine the longitudinal-radial (LR) and longitudinal-tangential (LT) shear strength properties (fvLR, and fvLT) for three wood species (Hymenolobium petraeum, Erisma uncinatum and Couratari sp) as a way to correlate the strength between planes through the evaluation by analysis of variance and validation tests. Shear strength, compressive strength and anatomical characterization tests were carried out to support the evaluation of correlations. The results revealed that the shear strength was statistically different (p-value <0.05) when the load plane was changed for all three species. Hymenolobium petraeum (fvLT = 6.36 MPa; fvLR = 12.68 MPa) and Couratari sp. (fvLT = 11.73 MPa; fvLR = 12.97 MPa) species were stronger in the LR plane than in the LT plane, while Erisma uncinatum wood was weaker in the LR plane (fvLT = 13.81 MPa; fvLR = 9, 97 MPa). In addition, Hymenolobium petraeum showed the greatest difference between the characteristic results when two planes were compared each other. Therefore, these species should be always tested in their weakest plane, in order to prevent the undersized design of their cross sections. The correlation between anatomical characteristics and shear strength demonstrated that the width and frequency of rays, axial parenchyma, grouping of vessels and fibrous zones are strong factors that influenced the shear results. Moreover, the correlation between characteristic values of shear strength and compressive strength prescribed by the Brazilian standard code proved to be conservative for hardwoods.

Sustainability, 2023

Recently, both authors led a comprehensive review to discuss cross-laminated timber (CLT) as an e... more Recently, both authors led a comprehensive review to discuss cross-laminated timber
(CLT) as an engineered wood product, addressing the information and discussion on this building
input in terms of the main details, materials, production forms, performances, codes, sustainability,
applications, and perspectives for residential uses. The current scenario of CLT developers was raised
in that previous paper as one of the missing factors in the available literature, and was the reason
why this gap became the main goal of the present study. A global perspective was driven to provide
information and discussion to every possible stakeholder. A systematic review on this sector was
carried out, through the Web of Science and Scopus databases, to collect information and confirm
this gap, using a representative method. CLT manufacturers were identified by their own websites,
using a blended strategy formed by the systematic review results combined with the search for these
companies using the Google search engine. Nearly a hundred CLT developers were identified and
analyzed, in a representative sampling process. Results demonstrated that the CLT industry has
manufacturing plants on the five habitable continents, which evinced a global commercial interest in
this timber forest product. Despite the global presence of this mass timber product, most producers
are concentrated in the northern hemisphere, despite being willing to serve international markets.

International Journal of Construction Management, 2023

Versatile, wood has been used by mankind in furniture, instruments, utensils and construction. Ab... more Versatile, wood has been used by mankind in furniture, instruments, utensils and construction. About timber buildings, this critical review discusses their valuable and sustainable features that label their multiple options. Numerous contributions were compiled from the author's collection and prospection in relevant databases. Construction techniques were featured, vocations were identified and production systems were remarked to detail wood-based resources and residues. Discussions and suggestions were raised as promoting strategies. Secular buildings prove the convenience of wood materials in construction, since they have decent levels in sustainability, durability, stability, value added, aesthetics, strength and weight. Timber construction enables artisanal to industrial productions and traditional to contemporary techniques with different materials, sizes and architectural styles. Global barriers are marked by obscurities about logging and illegal deforestation, and deficiencies in the regulations of native species. The utilization of sustainably sourced wood, sylviculture as a viable social-economic driving force and several advantages of timber construction are positive reasons. Actions were proposed to drive policy and multiply timber buildings, since they form a promising segment for emerging bioeconomies of innovative nations. Changes in wood consumption to enhance sylviculture combined with the waste reutilization should intensify the sustainability of timber construction and establish industrial synergies.

BioResources, 2023

Tropical species are widely used in construction, and their physical and mechanical properties ha... more Tropical species are widely used in construction, and their physical and mechanical properties have been important characteristics with direct impact on the design of structures, especially the strength and stiffness of wood applied in them. Tests to obtain both parameters are conducted under ABNT NBR 7190 (1997) guidelines in Brazil, being rarely found in some research centers because of the higher costs of testing equipment. For instance, the toughness test depends on equipment with a pendulum, whose device requires accuracy and maintenance for reliable analyses. This paper aims to estimate toughness through another property more easily found, given by the compression strength parallel to the grain. For this, 20 tropical wood species of the South American region were used to obtain initial values of these properties. The characteristic values of the compression strength parallel to the grain as well as linear and quadratic regression models were obtained. Statistical analysis was performed and confirmed that a linear model gave better predictions than a quadratic model.

Forests, 2023

Cross-laminated timber (CLT) has been widely discussed as a relevant industrialized construction ... more Cross-laminated timber (CLT) has been widely discussed as a relevant industrialized construction solution. Numerous publications have considered CLT as a structural wood-based panel, but other documents have mentioned it as a building or even a construction system. Many authors address its application in multistory buildings, although single-family houses and lower building applications have become desirable topics as well. Given these gaps, this review study addresses a systematic method to evince the functions of cross-laminated timber in construction. The elucidation and discussion were led by technical and scientific contents through publications present in scientific websites and the Google web search engine. Intricate perceptions about the knowledge and reference of CLT functions were identified. From prospections, it was possible to state that CLT is a timber-forest product created in Europe, whose function acts as a structural composite panel of the engineered wood product category. However, CLT has been mentioned by many publications as a building or a construction system. Suggestions were raised to clarify to all readers with respect to misconceptions, and elucidate the construction systems capable of using it as the main resource. Discussions evinced the characteristics and potentials of this wood product. Even with its increasing application in tall buildings, the commercial application of CLT in low-rise buildings may be boosted by the possibility of large-scale production of industrialized houses.

Ambiente Construído, 2023

Shear strength parallel to the fibers (fv0) is extremely important for the design of timber struc... more Shear strength parallel to the fibers (fv0) is extremely important for the design of timber structures. Then, due to the lack of information related to a possible variation in the fv0 of hardwood species according to the load application plane in relation to its growth rings/rays, this work performed tests for the determination of fv0 according to NBR 7190-3 (ABNT, 2022b) varying load planes. Thereby, the load was applied on the longitudinal-tangential (LT) and longitudinal-radial (LR) planes of the species of caixeta (Simarouba amara) and roxinho (Peltogyne spp.). Through variance analysis (5% confidence), results did not point to statistical differences between fv0 values when the load plane was changed. Therefore, the fv0 of this species can be determined without significant risk of reduction according to ray/ring orientation. Furthermore, it was determined a ratio of fv0,k/fc0,k equal to 0.23 and 0.38 was determined for roxinho and caixeta, respectively. Thus, this result confirms the need for characterizing unfamiliar wood species when received on construction site, in order to save money and/or for safety reasons.

Nexo Revista Científica, 2024

Polymers, 2024

Caderno Pedagógico, 2024

Forests, 2024

Journal of Cleaner Production, 2024

Revista Principia, 2024

Cadernos Pedagógicos, 2024

Advances in Forestry Science, 2023

BioResources, 2023

Buildings, 2023

Agrarian Academic Journal, 2023

Hábitat Sustentable, 2023

Revista Árvore, 2023

Journal of Materials Research and Technology, 2023

Sustainability, 2023

International Journal of Construction Management, 2023

BioResources, 2023

Forests, 2023

Ambiente Construído, 2023

Book title: Bamboo and Sustainable Construction, 2023

Like wood, bamboo is utilized in different products for civil construction, either in natural or ... more Like wood, bamboo is utilized in different products for civil construction, either in natural or in engineered form. The easy proliferation in small-sized planted forests, rapid harvest cycles, and low environmental impacts in the planting and processing stages gave significant credentials to this renewable bio-based resource in the last years. In addition, different bamboo species are likely to be applied to structural applications. These facts value this biomaterial as a convenient input to supply the civil construction sector, above all, in more sustainable housing and infrastructure. Formerly, bamboo culms and esterillas were used in popular buildings using rudimentary solutions based on vernacular techniques. From the advancement of bioresource technology and industrialization, structural bamboo products and bamboo-based composites are being developed for modern buildings manufactured from prefabrication techniques. As a structural material in its multiple forms, bamboo can be used alone or together with other materials, which contributes to the diffusion of this commodity worldwide. Thereat, bamboo buildings may overcome their usual applications in Asia, Africa, and part of Latin America to be valued as a sustainable alternative for construction by engineering and architecture professionals from Europe, Oceania, and South and North Americas.

Gestão ambiental e desenvolvimento sustentável, 2018

The construction industry is one of the main sectors that contribute most to the Brazilian GDP. O... more The construction industry is one of the main sectors that contribute most to the Brazilian GDP. On the other hand the construction sites contribute to the waste of raw materials and, along with the need for reforms and new constructions, the immediate demand of labor presents a serious deficiency in the supply and quality in Brazil. This work aims to implement a questionnaire on the performance of construction companies in Itapeva São Paulo, with respect to solid waste and to map management and the manner of disposal of materials left over used by construction companies in building works . The methodological procedures and intended technicians in this work was based on a questionnaire with questions about the conhecimendo CONAMA legislation, employee training, environmental education construction, process quality control of knowledge and the relationship between these issues in understanding the mapping having waste generation. Of 6 interviews companies, half know the laws of CONAMA and there by the company an incentive and practices of environmental education, and training to optimize the production process knowing some quality control tool for construction.

III Congresso Brasileiro Interdisciplinar em Ciência e Tecnologia, 2022

The paper analyzed the Brazilian public university through dialectical logic and systematic revie... more The paper analyzed the Brazilian public university through dialectical logic and systematic review processes to discuss this topic. Rare opportunities for newly scientists and professors and incessant economic cuts in the education and science marked the current stage. There is a promising future justified by the establishment of new regional campuses and several modern university courses. The moment requires restructuration in scientific career, education synergy and promotion of these new options.

60º Congresso Brasileiro de Química, 2021

Muitos estudos com a madeira em altas temperaturas necessitam de material, instrumentos e equipam... more Muitos estudos com a madeira em altas temperaturas necessitam de material, instrumentos e equipamentos resistentes ao calor, para que após o experimento, possibilitem serem analisados posteriormente, sem perdas das amostras no processo experimental. Neste sentido, os cadinhos são recipientes utilizados para diversos ensaios laboratoriais, dentre eles, os testes de carbonização. Neste trabalho foi utilizado três tipos de cadinhos para a queima da madeira para obtenção de carvão, analisando por teste de hipótese estatístico, se há ou não interferência no tipo de cadinho, a permanência no interior da mufla e a perda de massa em amostras de várias espécies de madeira.

VII Congresso Brasileiro de Gestão Ambiental, 2016

A indústria da construção civil é um dos principais setores que mais contribuem com do PIB brasil... more A indústria da construção civil é um dos principais setores que mais contribuem com do PIB brasileiro. Por outro lado, os canteiros de obras contribuem para o desperdício de matéria-prima e, juntamente com a necessidade de reformas e novas construções, a demanda imediata de mão de obra apresenta uma séria deficiência na oferta e qualidade no Brasil. Este trabalho tem por objetivo implementar um questionário sobre a atuação das empresas de construção civil em Itapeva município de São Paulo, com relação aos resíduos sólidos e fazer o mapeamento de gerenciamento e o modo do descarte da sobra de materiais usados pelas construtoras nas edificações das obras. Os procedimentos metodológicos e técnicos pretendidos neste trabalho baseou-se em um questionário com perguntas sobre o conhecimento da legislação do CONAMA, treinamento dos funcionários, educação ambiental da construtora, conhecimento do controle de qualidade do processo e a relação com entre essas questões no entendimento no mapeamento de ter geração de resíduos. Das 6 empresas entrevistas, metade conhecem as leis do CONAMA e existe por parte da empresa um incentivo e práticas da educação ambiental, além de treinamentos para a otimização no processo produtivo conhecendo alguma ferramenta de controle da qualidade para a construção civil.

59th International Convention of Society of Wood Science and Technology, 2016

Brazil has experienced a crescent seek for housing alternatives in relation to masonry, and the w... more Brazil has experienced a crescent seek for housing alternatives in relation to masonry, and the wooden houses have demonstrated as a very rational and sustainable possibility. However, the production of building parts and components can present environmental liabilities, both if the timber companies which compose this chain do not have efficient plans for the management of their generated waste and if these companies do not present technologically advanced production lines. These wood-based wastes from the civil construction activities are found in the pure and natural modes or through the chemical modification of wood. Both residual examples can pollute and result in irreversible environmental problems if assertive actions are not applied for their control and discard. Nevertheless, this study aims to discuss the problem about the topic of wooden waste from civil construction, as well as share proposals to help in the mitigation of this Brazilian current question.

59th International Convention of Society of Wood Science and Technology, 2016

The inconvenience with the generation of wood waste has become an increasing problem among compan... more The inconvenience with the generation of wood waste has become an increasing problem among companies of the forestry sector. For that reason, the study aimed to obtain and disseminate the data on the generation and disposal of timber waste of the wooden-housing manufacturers, located in São Paulo State, aiming to assist them on the potential for reuse of their wood waste. For this evaluation, it was applied a questionnaire directed to the owners or their representatives, in order to obtain the volume, characteristics and final destination of the wood waste produced exclusively for a single-storey housing unit of 100 m 2. It was discovered that most of these house manufacturers have no control or quantification of their residues, and many even have an accurate separation process aiming their reuse. Then, a real opportunity of processing of these wooden wastes in manufactured goods is lost. Thereat, it was discussed the current situation of these timber companies, indicating some ideas for improving their wood waste management. A simple selective collection realized in these industries and on respective building sites could help to mitigate this evident environmental liability. This collection system could be based on the separation of waste into colored dumpsters or containers for three destinations: solid wood, treated wood and wood-based panels. Public incentives will help this sector to achieve its sustainable development with cleaner productions.

III Jornada de Gestão e Análise Ambiental, 2014

Itapeva é um município do interior do Estado de São Paulo, a qual dista a 281 km da capital. Junt... more Itapeva é um município do interior do Estado de São Paulo, a qual dista a 281 km da capital. Juntamente com mais outros 14 municípios, formam a região do Sudoeste Paulista, a qual integra o CONSAD (Conselho Nacional de Segurança Alimentar e Desenvolvimento Local), este que incentiva a agricultura familiar. O município foi fundado em 1769 pelo motivo de ser um ponto de parada dos tropeiros que vinham do Rio Grande do Sul em direção a Sorocaba e São Paulo. Desde esse tempo a região Sudoeste Paulista se mostrou como região propicia para a agricultura e pecuária. Segundo os dados do IBGE-Itapeva, a população estimada em 2013 é de 91.807 habitantes, enquanto que o Censo de 2010 identificou uma população de 87.753. A área territorial itapevense é de 1.826,258 km², enquanto que sua densidade demográfica situa em 48,05 hab/km². No ano 2000, dos seus 82.866 habitantes, 21.912 habitavam na zona rural de Itapeva (CENSO, 2000), enquanto que em 2010 o município apresentou uma população rural de 13.797 (CENSO, 2010). Com isso, percebe-se um êxodo rural da ordem de 62,97%, enquanto que no mesmo período, a população aumentou em uma escala de 5,57%. No mesmo cenário, a produção duplicou para a lavoura temporária ou rotativa (IBGE, 2014): em 2000 a área destinada a colheita foi de 54.680 hectares e em 2012 chegou a 107.050 ha, enquanto que o valor da produção saltou de R$ 81.344,00 para R$ 421.971,00 (valores em mil). A lavoura permanente teve uma queda pela metade em doze anos: em 2000 a área ocupada foi de 1.001 hectares e em 2012 foi de 525, já o valor da produção praticamente quintuplicou passando de R$ 1.269,00 para R$ 6.078,00 (valores em mil). Segundo a CATI (2008), a ocupação dos solos agricultáveis, em hectares, varia de: 57.029,4 para braquiária, 32.132,8 (milho), 19.032,8 (soja), 17.558,4 (eucalipto), 14.848,1 (pinus), 6.821,0 (feijão), 6.240,1 (trigo), 3.982,9 (cana-de-açúcar) e as demais 22 culturas não ultrapassando 1000 hectares cada. Para alcançar essas taxas elevadas, nota-se uma maior mecanização no campo ao longo da década, justificada pela forte aquisição, por parte dos proprietários rurais, de máquinas e implementos agrícolas de alta tecnologia. Essa situação acarreta na demanda de uma mão-de-obra mais qualificada, o que obriga os habitantes rurais a se qualificar para continuar trabalhando nas fazendas ou até abandonar a zona rural em busca de outras oportunidades na zona urbana. Como consequência, observa-se que a zona urbana tem crescido gradualmente, e assim, tem alterado o ambiente social, desde as questões financeiras e política. As considerações finais são de que Itapeva-SP é fortemente propensa à agricultura, contudo, a sensível desocupação de pessoas na zona rural tem sido resultado da forte mecanização na agricultura sofrida na ultima década. O melhor uso do solo e a mecanização contribuíram, para, além desse êxodo rural atual, alcançar maiores produtividades e maior retorno financeiro para o agricultor.

VI Congresso de Extensão Universitária da Unesp, 2011

Introdução: O aumento da disponibilização de resíduos gerados pelas indústrias madeireiras gera u... more Introdução: O aumento da disponibilização de resíduos gerados pelas indústrias madeireiras gera um problema para a cadeia produtiva, pois, muitas vezes, estes resíduos são depositados em locais inadequados ou reutilizados de modo errado. A concepção de pequenos objetos de madeira tem o enfoque de reaproveitar resíduos lignocelulósicos provenientes de processos industriais, poda urbana e de construções. A utilização de resíduos é devido a um baixo custo relativo à sua disposição final, sustentabilidade do produto e disponibilidade em muitas empresas. A confecção destes produtos é simples e possui mão-de-obra pouco qualificada, fator que promove a geração de trabalho e de renda para artesãos de pequenos empreendimentos econômicos solidários. Objetivos: O objetivo deste trabalho consiste em valorizar o potencial do resíduo madeireiro, com um enfoque no seu reaproveitamento, visando o desenvolvimento regional do trabalho e da renda de uma forma sustentável. Deste modo, tem por objetivo preparar e qualificar jovens em vulnerabilidade social para o mercado de trabalho, bem como dar continuidade à qualificação de um grupo de marceneiras do assentamento do Pirituba II. Métodos: Esse programa terá como público-alvo os adolescentes moradores dos bairros mais pobres de Itapeva-SP. É necessário trabalhar com essa população economicamente ativa oferecendo profissionalização e inserção no mercado de trabalho. Além de oferecer cursos de qualificação de mão-de-obra, também estão sendo oferecidas orientações sócio-educativas, dinâmicas de socialização e formação de consciência cultural coletiva através da arte em parceria com a Prefeitura Municipal de Itapeva. Em relação a colaboração da universidade com o grupo de marceneiras no período foram realizados cursos de capacitação de acabamento e técnicas de mercado. Resultados: A simplicidade obtida pelos produtos é resultado de uma manufatura que visa uma produção com poucas e rápidas operações, o que tangencia sua inclusão como processo produtivo de baixo custo, o que resulta de atividades simples em conjunto com a matéria-prima oriundo de resíduos lignocelulósicos. A facilidade da confecção destes produtos, aliado à necessidade de uma mão-de-obra pouco qualificada, promove o trabalho e a renda tanto para as pessoas que estão na informalidade, quanto para os indivíduos sem emprego. Os resultados esperados são para as marceneiras melhorias na qualidade dos produtos construídos e, consequentemente, aumento na renda familiar. Já para os jovens aprendizes, os resultados são a geração de trabalho e renda, bem como a criação de um novo empreendimento para o grupo, visando à ampliação do potencial produtivo madeireiro na região e o aumento da divulgação de novas possibilidades econômicas.

The wood is a natural material that presents great variability in its mechanical properties and i... more The wood is a natural material that presents great variability in its mechanical properties and its use is suitable when it is classified correctly. The main objective of this work was to contribute to the physical-mechanical classification of 10- year-old Eucalyptus grandis wood, with variation of wood positioning in the sapwood to heartwood, from the Itapeva / SP region. The removal of the specimens and the conduction of the tests followed the requirements of normative document ABNT- NBR 7190:1997. The mechanical tests were carried out in the Universal Testing Machine EMIC DL - 30 ton. The values found for physical and mechanical properties were higher or equivalent to those reported in the literature. There was a statistically significant difference only for the tensile strengths parallel to the fibers, shear and static flexion in the bark direction to the bone marrow, with the values obtained in the bark region being higher than in the marrow region. By means of the results obtained and comparison with other authors' researches with old wood, it can be concluded that for the age of 10 years there were no statistical differences in some variables due to the lack of adult wood in the trees.

Euro-Elecs 2015, 2015

The timber production chain in Brazil still suffers with several difficulties related to the wast... more The timber production chain in Brazil still suffers with several difficulties related to the waste management. Most sectors within this timber chain never account or classify their waste. It is a chronic problem present in all of Brazilian States, whereas the local Governments never stimulated industrial clusters with assertive policies to mitigate this problem. Through this latent demand, the present paper aims to develop a research focused on a survey about the wood waste generated by the manufacturers of wooden housing in the Brazilian State of Santa Catarina. This work contained a survey formed by three important questions to evaluate the waste management by these timber industries specific for construction. In the end of this data mining, it was verified that these industries do not reuse their wood waste, as well as these companies do not evaluate or classify these generated wastes, according to the size, class or volume. This survey showed that these timber industries do not have any plans to reduce this environmental liability, and also the local Government urgently needs to create newer public policies to stimulate these industries. Furthermore, despite of the proliferation of human managed forests, the industries still use native woods in most of these wooden houses.

La humedad relativa del aire dentro de una habitación es un factor relevante para determinar el c... more La humedad relativa del aire dentro de una habitación es un factor relevante para determinar el confort humano en una edificación. Este estudio evalúa la importancia de la verificación de la humedad relativa interior de construcciones de madera fabricadas con la técnica woodframe. La construcción evaluada se encuentra en el campus de Itapeva de la Universidad Estatal Paulista, en el Estado de Sao Paulo. En este estudio se presenta el comportamiento de la humedad en el interior de esta construcción woodframe en un período de evaluación ininterrumpida entre abril y diciembre, que comprende 259 días. Los resultados de la humedad relativa media se trataron estadísticamente después de la recolección de los datos realizado por un termo-higrómetro. Este instrumento se inserta dentro de la sala de la construcción woodframe durante el período analizado y presenta una humedad relativa interior promedio de 59,0%, con una desviación estándar de 7,8566. La humedad promedio fue comparada con la norma brasileña NBR-16401-2. El análisis de los resultados indica que la humedad relativa obtenida está dentro de la norma. En otros análisis, a través de los índices de la Organización Mundial de la Salud (OMS), la humedad relativa en esta construcción de madera está dentro de la norma ideal. Esta evaluación demostró que, en Brasil, la construcción woodframe conserva la humedad relativa interior en un nivel aceptable por la OMS.

A housing system that uses wood in its structure coincides with any construction process that int... more A housing system that uses wood in its structure coincides with any construction process that integrates, with coherence and balance, one or more set of elements and/or structural subsystems made with this raw material. Therefore, a wooden house is any system that uses this raw material in its structure and or walls, pure or mixed with other materials. Despite its popularity, wooden houses do not have a standardized classification to define and organize their main aspects. In the literature of wooden buildings, most authors emphasize structural systems for large spans (bridges, roofs, hangars, etc.). Thus, wooden housing classification reflects a tortuous theme of literature, considering many criteria and analysis of different aspects, along with few studies and limited subjects for this particular theme. This study was formed by two parts: the state of the art about the wooden housing techniques commercially produced worldwide, and the proposal of the standardized classification to cover and enclose the main aspects analyzed in this particular topic, i.e., manufacturing level and chronological origin. Sixteen construction typologies of wooden housing were analyzed and classified. This classification should assist in a better understanding of distinct wooden housing techniques commercially produced worldwide, diffusing their concepts and possibilities as forestry-timber products.

XXII CBECiMat - Congresso Brasileiro de Engenharia e Ciência dos Materiais

Over the years the environment has been transformed and affected negatively and, in most cases, t... more Over the years the environment has been transformed and affected negatively and, in most cases, this is due to waste incorrect disposal from industries such as, for example, timber or that it is derived, such as furniture. To reduce such problems, it is necessary to find alternative ways of reusing such waste. This study aims to characterize furniture waste, wood-based basis, after its use, the bonding quality of Pinus laminae as surface finish, considering three different bonding processes, and as well as the characterization of the modules rupture and elasticity in static bending. It follows from this work that the bonding laminaes as surface finish on furniture waste wood derived base, after its use, with 8 clamps "type C" is the most interesting among the other studied.