David Yemboini Kader Toguyeni | Ouagadougou University (original) (raw)

Papers by David Yemboini Kader Toguyeni

Engineering, 2023

The present study allowed to carry out a thermal characterization of concrete and cement mortar. ... more The present study allowed to carry out a thermal characterization of concrete and cement mortar. Thermal tests were carried out with the KD2 Pro device, on concrete and mortar samples taken from twenty-six (26) construction sites of office buildings and two (2) industrial production units in the city of Ouagadougou. The tests were carried out on rectangular specimens after four weeks (4) of conservation on the site of construction or production of materials. This study seeks to determine the thermal properties of the materials, in particular the thermal conductivity, the thermal diffusivity and the thermal capacity of the samples, in the real conditions of execution of the buildings and environment. The thermal conductivity varies from 1.413 to 1.965 W/m•K, 0.940-1.658 W/m•K and 0.703-1.149 W/m•K respectively for concrete, cinder block mortar and plaster mortar. Regarding the other properties, especially the capacity and thermal diffusivity, the values vary respectively, from 1070.59-1974.67 kJ/kg•K and (3.74-6.70) × 10 −7 m 2 /s for concrete, from 1123.69-1586.81 kJ/kg•K and (3.38-5.65) × 10 −7 m 2 /s for plaster mortar and 1202.51-1736.01 kJ/kg•K and (3.82-7.36) × 10 −7 m 2 /s for the mortar of building blocks. The conductivity, capacity and thermal diffusivity of industrial mortar vary from 1.019-1.229 W/m•K, 792.18-1862.58 J/kg•K and (2.75-6.80) × 10 −7 m 2 /s, respectively. Only the correlations made between the thermal properties and the density of the samples of the plaster mortar, give good relations namely R 2 = 0.9308 for the thermal conductivity, R 2 = 0.

The success or failure of river closure is directly related to the construction period and projec... more The success or failure of river closure is directly related to the construction period and project benefit. Therefore, it is very necessary to study the river closure by an appropriate method. In this paper, a 1D-2D coupled river closure model is established to optimize the closure flow rate, closure period, and layout of a real closure project. The 1D transition model between open channel flow and pressurized flow is established by a finite volume scheme. For the 2D model, 2D shallow water equations are solved using an unstructured finite volume scheme. The 1D model and 2D model are coupled by considering the mass and momentum conservation. To validate the model, a physical experiment of a real river closure project is set up according to the gravity similarity criterion with a scale of 1:80. Then, the experimental data obtained by the calibrated physical experiment is compared with the numerical results. Good agreements are achieved in terms of surface elevation, velocity, and flow rate. Finally, the real river closure project is further investigated by the model. The layout, closure flow rate and closure period of this project is analyzed and optimized. The original design of the berm is more suitable to discharge the flow. Moreover, the first stage cofferdam should be removed to floor elevation upstream and downstream of the dam. The river closure flow rate should not exceed 2380 m 3 /s.

Current Journal of Applied Science and Technology, Dec 27, 2021

Buildings should be assessed in their energy behaviour to identify the most suitable construction... more Buildings should be assessed in their energy behaviour to identify the most suitable construction material for the climatic context. This paper studies the influence of construction materials for the wall in housing hygrothermal behavior and energy efficiency. Three types of construction material for the wall, which are CSEB of fonio straw and Shea butter cakes, cement blocks, and cut laterite blocks were selected and the building design was modeled in the DesignBuilder interface. The thermal comfort and total amount of energy required for building cooling were calculated using dynamic modelling using EnergyPlus software. The simulation was run according to the meteorological parameters of Ouagadougou city and we noted that the housing thermal behaviour is impacted by the wall in earth-based. The results show that the number of warm thermal discomfort Original Research Article

Book Publisher International (a part of SCIENCEDOMAIN International), Jul 1, 2022

The impact of wall construction materials on dwelling hygrothermal behavior and energy efficiency... more The impact of wall construction materials on dwelling hygrothermal behavior and energy efficiency is investigated in this research. Most people want to live in a sophisticated ambiance in this modern age and spend massive investment on improving their buildings' inside condition. The building design was created in the Design Builder interface using three types of construction materials for the wall: CSEB of fonio straw and Shea butter cakes, cement blocks, and cut laterite blocks. Dynamic modeling with Energy Plus software was used to calculate the thermal comfort and overall amount of energy required for building cooling. The simulation was done using the meteorological characteristics of Ouagadougou city, and we discovered that the thermal behavior of the housing is influenced by the wall in earth-based simulations. The findings demonstrate that in housing with a CSEB of fonio straw and Shea butter cakes masonry wall, the number of warm thermal discomfort hours and cooling energy loads are reduced by an average of 10.60 percent and 93.86 percent, respectively, when compared to housing with a cement or cut laterite blocks masonry wall. In terms of the inside environment, the earth-based impact of this wall allows for an average internal temperature and indoor operating temperature of 28.64°C and 25.82°C, respectively. 6.54°C is attained as the average indoor temperature peaks dampening (i.e. 22.83 percent). As a result, these CSEB walls offer an effective contribution to the development of sustainable dwellings in a hot climate.

International journal of advanced research, Aug 31, 2022

The environmental problem posed by non-biodegradable waste, such as non-reusable glass bottles, i... more The environmental problem posed by non-biodegradable waste, such as non-reusable glass bottles, is becoming a major concern in view of the huge quantities in landfills in underdeveloped countries. Prospecting the valorization of waste glass in rural constructions constitutes a potential to reduce the use of natural materials in concrete industry. In this paper, the issues of environmental and ecological construction materials are addressed by the use of waste glass powder (Ã˜â‰¤80Î¼m) as replacement of cement in concrete. The aims of this project work is to usewaste glass powder in range of 10wt% to 20wt% as replacement of cement into concrete and concrete cylinder tested for its density, workability and compressive strength up to 45 days of age compared to those of conventional concrete. The obtain results indicate that the workability is increasing, the density and the compressive strength are decreasing up to 20wt% replacement ratio. Moreover, the compressive strength of WGP based concrete is lower than that of conventional concrete up to 28 days of age and becomes superior from 45 days age. The best obtain average values of workability and compressive strength are respectively 7.2cmand 30.25MPa up to 28 days of age for the case of BPV20. Thus, for its good pozzolanic characteristics and the influence on the properties of concrete, the glass powder obtained by basic grinding non-reusable glass debris can be used in the formulation of ecological concrete for common civil engineering applications.

IRA - international journal of applied sciences, Aug 9, 2021

The scholarly papers as reviewed and published by IRA Academico Research are the views and opinio... more The scholarly papers as reviewed and published by IRA Academico Research are the views and opinions of their respective authors and are not the views or opinions of IRA Academico Research. IRA Academico Research disclaims any harm or loss caused due to the published content to any party. IRA Academico Research is an institutional publisher member of Publishers International Linking Association Inc. (PILA-CrossRef), USA. IRA Academico Research is an institutional signatory to the Budapest Open Access Initiative, Hungary advocating the open access of scientific and scholarly knowledge. IRA Academico Research is a registered content provider under Open Access Initiative Protocol for Metadata Harvesting (OAI-PMH).

Materials Sciences and Applications

Flexible pavements, whose surface layers are made from hot mix asphalt, may show rutting in some ... more Flexible pavements, whose surface layers are made from hot mix asphalt, may show rutting in some of these infrastructures during the first months of life. In the city of Ouagadougou, this rutting phenomenon is sometimes observed. The objective of this article is to quantify the thermal response of the wearing course of national roads 1 and 2, when they are subjected to the braking of heavy trucks of 13 tons and 20 tons per axle. The meteorological conditions retained are those of the Burkinabe climate. The evaluation of the temperature was carried out by numerical simulation using the Comsol Multiphysics 5.2 software. This study showed that the thermal response of the pavement to the combined effects of surface temperature, overloading by a 20 tons heavy truck and braking during a heat wave increase in pavement surface temperature ranging from 1.09% for National Road 1 to 0.91% for National Road 2, particularly in the braking zone. This made it possible to establish the diagnosis according to which the nature of the bitumen used on the wearing course can reduce rigidity modulus. In predictive terms, they allowed us to deduce that an under-dimensioning of the wearing course, even if the bitumen was used is adequate.

Materials Sciences and Applications

This experimental study aims at the reuse of recycled aggregates (RA), resulting from the demolit... more This experimental study aims at the reuse of recycled aggregates (RA), resulting from the demolition of concrete, cement block and cement mortar, in the manufacture of common construction in Burkina Faso. The RA can readily replace natural aggregates in concrete. Then five formulations of natural and recycled aggregates based concrete for characteristic strength of 25 Mpa were prepared in addition to the natural aggregates base concrete named reference concrete (BN): two types of recycled aggregates concrete (BR), three types of recycles and natural combined aggregates base concrete (BC). The properties of natural and recycled aggregates were characterized and the physical, mechanical strength and durability properties were also evaluated for all concrete specimens. All the studied concrete formulation present a density between 2000 kg/m 3 ≤ ρ ≥ 2600 kg/m 3 and an average slump of 4.9 ± 0.1 cm. The obtained results indicate that the recycled aggregates are suitable for current concrete. Two out of the five combinations studied, such as the natural (BN) and combined aggregate (BC2) based concretes satisfy the mechanical characteristics (Rc 28 > 25 MPa) at 28 days of age and an average absorption coefficient of 2.93% and 3.98%. The recycled aggregate based concrete (BR1, BR2) and combined aggregate based concrete (BC1), gave respective average compressive strength of 21.55 MPa, 20.50 MPa and 20.30 MPa, i.e. a difference of 13.80% to 18.80% under the characteristic strength (25 MPa

Current Journal of Applied Science and Technology

The waters of the torrential rains in the city of Ouagadougou lead to the appearance or amplifica... more The waters of the torrential rains in the city of Ouagadougou lead to the appearance or amplification of damage to the surface of asphalt pavements during the rainy season. Road infrastructure maintenance campaigns follow one another almost every rainy season to fill potholes and cracks observed on the pavements. Several hypotheses can be put forward as to the origin of the action of water on the surface of pavements: the pressure of runoff water, infiltration, thermal expansion during the rainy episode, etc. These various reasons reveal the need to take rainwater into account when designing pavements. A previous study on the effect of heat waves on pavement design made some recommendations for better design. It has raised the interest to observe the impact of rain on pavement deformability. The objective of this article is to estimate, as a first approach, the effect of tropical rains on the Thermomechanical behaviour of bituminous pavements formulated with pure grade 35/50 bitumen...

Global Journal of Environmental Science and Management, 2021

BACKGROUND AND OBJECTIVESIn landfills, containment is provided by natural or artificial clayey ma... more BACKGROUND AND OBJECTIVESIn landfills, containment is provided by natural or artificial clayey materials known for their low permeability and for their pollutant retention capacity. However, the properties of these media are modified by leachates, whose migration they are supposed to limit. This study aims to reconsider the criteria for choosing suitable materials to make a bottom liner through both their long term hydraulic and mechanical performances.METHODSTwo fine materials sampled in Burkina Faso (West Africa) have been characterized in order to compare their hydro-mechanical behavior in the presence of household waste leachates. The first material is classified as an inorganic clay of low to medium plasticity according to Casagrande plasticity diagram, it is mainly kaolinitic with some traces amounts of smectites. The second one is classified clayey sand of low to medium plasticity, the predominant mineral clay being kaolinite. Hydro-mechanical tests were performed on both sam...

DOAJ (DOAJ: Directory of Open Access Journals), Dec 1, 2013

In this paper, we study the influence of local materials for insulating roof and fiber-reinforced... more In this paper, we study the influence of local materials for insulating roof and fiber-reinforced mortar coatings on cooling loads of a home in dry tropical climate. The wall of the housing is made of cinderblock or laterite and the insulating material of a roof panel is made with lime (24%), cement (6%), water (50%) of vegetable fibers hibiscus sabdariffa (16%), tree widespread in Burkina Faso and sugar cane bagasse (4%). This panel roof insulation and the fiber-reinforced mortar were characterized at the Laboratory of Physics and Chemistry of the environment by the hot plate method. The building is modeled in TRNSYS using climate data from the city of Ouagadougou. The results obtained show that in the warmer months of the year, that is to say in March and April, the relative differences between heat gains configurations the configurations "breeze block-coating mortar and roof not insulated" and 'lateritefiber-reinforced mortar coating and insulated roof' vary between 15.6 % and 16.8 %. Configuration 'lateritefiber-reinforced mortar coating and insulated roof allows a reduction of annual heat gains of 15.5% compared to the configuration 'breeze block-coating mortar and roof not insulated'. Résumé-Dans cet article, nous étudions l'influence des matériaux locaux pour le toit et les revêtements de mortier renforcé de fibres d'isolation sur les charges d'une maison en climat tropical sec de refroidissement. La paroi du boîtier est réalisé en parpaing ou en latérite et le matériau isolant d'un panneau de toit est fabriqué avec de la chaux (24%), du ciment (6%), eau (50%) de fibres végétales Hibiscus sabdariffa (16%), l'arbre répandu au Burkina Faso et la bagasse (4%). Cette isolation de la toiture du panneau et le mortier renforcé de fibres ont été caractérisées au Laboratoire de Physique et Chimie de l'environnement par la méthode de la plaque chaude. Le bâtiment est modélisé dans TRNSYS en utilisant les données climatiques de la ville de Ouagadougou. Les résultats obtenus montrent que, dans les mois les plus chauds de l'année, c'est-à-dire en Mars et Avril, les différences relatives entre les configurations des gains de chaleur la configuration 'brise mortier bloc de revêtement et le toit pas isolés' et 'mortier latérite renforcé de fibres revêtement et toiture isolée' varient entre 15,6% et 16,8%. Configuration' revêtement de mortier de latérite renforcé de fibres et isolation du toit permet une réduction des gains de chaleur annuels de 15,5% par rapport à la configuration 'de mortier brise bloc de revêtement et le toit pas isolés'.

Journal of Minerals and Materials Characterization and Engineering, 2022

Current pavement design methods do not allow for the reduction of early deformation of the surfac... more Current pavement design methods do not allow for the reduction of early deformation of the surface layers of bituminous pavements in the city of Ouagadougou. Weather conditions combined with traffic, particularly during heat waves, are factors. The temperature at the surface of the bituminous pavement can reach 62˚C but the complex modulus associated with this temperature is not taken into account in the design, hence the interest in proposing laws of dependence of the complex moduli is taken into account in the maximum temperatures of the pavement surface. The objective of this paper is to propose an experimental method to determine the temperature dependence of the complex moduli of asphalt mixes for temperatures between 40˚C and 70˚C. This experimental method consists of performing axial compression tests on cylindrical asphalt specimens. It was applied to three different formulas of bituminous mixes, intended for the wearing course, obtained from mixes of crushed granites, granular classes 6/10, 4/6 and 0/4, pure bitumens of grade 50/70, 35/50 and modified bitumen of grade 10/65. The comparative study of the experimental results obtained with the results of a semiempirical methodology revealed a root mean square deviation from the mean of between 6.58% and 14.8% of the norms of the complex moduli (modulus of rigidity) of the asphalt mixes for a fixed frequency of solicitations of 10 Hz. The consistency of these results with data from the literature led to the initial conclusion that asphalt mixes formulated with 35/50 and 10/65 bitumen would have better compressive strength than those formulated with 50/70 bitumen, for exposure temperatures between 40˚C and 70˚C.

European Journal of Environmental and Civil Engineering

Cette these est consacree a l'etude des changements de phase, avec coexistence de deux phases... more Cette these est consacree a l'etude des changements de phase, avec coexistence de deux phases initiales, dans les fluides a deux composants chimiques. Les transitions de phase etudiees sont la solidification avec equilibre thermodynamique initial, la dissolution et la fusion hors equilibre thermodynamique unidimensionnelles. Deux algorithmes sont developpes et utilises pour simuler la solidification des solutions aqueuses de chlorure de sodium. Une comparaison portant sur la rapidite de calcul et la precision des resultats des deux algorithmes est faite, puis les champs de temperature, de fraction massique (de solute) et la position du front solide-liquide sont analyses. En ce qui concerne les transitions de phase hors equilibre thermodynamique initial (fusion, dissolution), un processus d'initialisation du calcul est propose pour rendre compte de l'instauration de l'equilibre thermodynamique qui se produit au bout d'un temps inconnu a priori ; l'algorithme l...

Journal of Materials Science and Engineering B

The purpose of this article is to propose a two-dimensional (2D) model in finite element of distr... more The purpose of this article is to propose a two-dimensional (2D) model in finite element of distribution of the temperatures and deformations in extreme weather conditions of Burkina Faso (heat wave, heavy showers) using the software COMSOL Multiphysics. This model takes into account the hourly weather conditions (solar radiation, air temperature, air humidity, dew temperature, wind speed) as well as the temperature dependence of the mechanical parameters (elastic modulus, poisson ratio) of the asphalt pavement materials.The obtained results show that it’s possible to identify, for periods of the day, the existence of nonlinear and permanent deformations at the level of the superficial layers of the pavement. The meteorological factor proved to be more than decisive in the choice of bitumen used for the realization of asphalt pavement in tropical zones. ARTICLE HISTORY Received 19-11-2019 Revised 12-02-2020 Accepted 20-02-2020 Published 21-04-2020

L’etude porte sur le comportement thixotrope des boues de la station d’epuration des eaux de Ziga... more L’etude porte sur le comportement thixotrope des boues de la station d’epuration des eaux de Ziga. La rheologie de suspensions aqueuses plus ou moins concentrees est etudiee a l’aide du rheometre Physica MCR (Anton-Paar) dote des geometries « cone-plan » ou « cylindres de Couette ». La gamme des concentrations (ou siccite) exploree va de 6% a 47%, pour des temperatures de bain allant de 25°C a 45°C. L’etude met en evidence que les suspensions de boue se comportent comme un fluide newtonien pour une siccite W inferieure a 6,25%, et comme un fluide a seuil thixotrope pour les grandes valeurs de W. La contrainte seuil de declenchement des ecoulements a ete analysee et une correlation est proposee. Mots cles: Contrainte seuil, thixotropie, rheologie, fluide newtonien, siccite English Abstract The study focuses on the thixotropic behavior of the sludge treatment plant water Ziga. The rheology of aqueous suspensions of varying concentration is studied using the Physica MCR rheometer (Anto...

Current Journal of Applied Science and Technology, 2020

This study allowed appreciating hygrothermal behavior, thermal comfort and the visual comfort of ... more This study allowed appreciating hygrothermal behavior, thermal comfort and the visual comfort of an existing Nubian vaulted building in the city of Ouagadougou. To achieve that purpose, we measured parameters such as the temperature and relative humidity of the indoor and outdoor environments as well as illumination by daylight inside the studied building. The measurement campaign consisted of two (02) series of three (03) days in January 2018: one series with insulation of the louvered openings by polystyrene and the other series without the insulation. We carried out the measurements of relative humidity and illumination at 7, 10, 12, 15, 17, 20 and 22 o'clock and adopted a one-hour measurement time step for temperatures. The analysis of these parameters showed that the level of natural lighting in the building was insufficient. In addition, for the indoor ambiance, we have obtained indoor thermal amplitude less than 1.5°C, a decrement factor of less than 6%, a time lag of 6 t...

Physical Science International Journal, 2020

The method used to evaluate the quality of concrete in structures includes, among other things, c... more The method used to evaluate the quality of concrete in structures includes, among other things, compressive strength testing of specimens cast on site. This method has shortcomings due to the non-uniformity in their formulation processes of the concrete studied in laboratories and that of the structure on site and the tardiness in obtaining test results. This is why the development of reliable methods of non-destructive assessment of the compressive strength of concrete in situ is essential for a better performance assessment of structures.There are a multitude of non-destructive methods, but in this article, the ultrasonic pulse velocity (UPV) and the rebound hammer (RH) are the methods used as they are easy to get manipulate, accessible and permit fast access to results. Analyses using single and multiple linear regression methods have been carried out with the results from compression tests and measurements of pulse velocity and rebound indices carried out between February and Ap...

Engineering, 2023

Current Journal of Applied Science and Technology, Dec 27, 2021

Book Publisher International (a part of SCIENCEDOMAIN International), Jul 1, 2022

International journal of advanced research, Aug 31, 2022

IRA - international journal of applied sciences, Aug 9, 2021

Materials Sciences and Applications

Current Journal of Applied Science and Technology

Global Journal of Environmental Science and Management, 2021

DOAJ (DOAJ: Directory of Open Access Journals), Dec 1, 2013

Journal of Minerals and Materials Characterization and Engineering, 2022

European Journal of Environmental and Civil Engineering

Journal of Materials Science and Engineering B

Current Journal of Applied Science and Technology, 2020

Physical Science International Journal, 2020

Résistance statique de matériaux aux sollicitations thermomécaniques Ce livre intitulé « Résistan... more Résistance statique de matériaux aux sollicitations thermomécaniques Ce livre intitulé « Résistance statique de matériaux aux sollicitations thermomécaniques» est la compilation de deux articles parus dans un journal à comité de lecture francophone. Il vise à fournir à des étudiants de licence et master professionnels en génie civil ou en génie mécanique des cas concrets d'application des sciences de l'ingénieur que sont la résistance des matériaux et la mécanique des structures. Il présente en particulier comment un logiciel du calcul des structures, RDM6 conçu par Yves DEBARD, peut être utile à la modélisation et à la résolution de problèmes d'ingénierie.

"Le présent ouvrage est à l’usage des étudiants de licence 3 (dans le référentiel du LMD), des él... more "Le présent ouvrage est à l’usage des étudiants de licence 3 (dans le référentiel du LMD), des élèves ingénieurs de 1ère année et de Master 1 en énergie, matériaux ou génie civil. Il comporte outre un avant propos, une introduction, une conclusion et deux annexes, six chapitres.
Le chapitre 1 intitulé « ELEMENTS DE L’ALGEBRE TENSORIELLE »donne les bases de l’algèbre tensorielle.
Le chapitre 2 « CINEMATIQUE DES MILIEUX CONTINUS DEFORMABLES » permet d’introduire les descriptions eulériennes et lagrangienne du mouvement, établit l’équivalence de ces deux descriptions puis offre le moyen de calculer les dérivées particulaires de toute grandeur attachée au milieu continu, en particulier l’accélération
Le chapitre 3, ou « DEFORMATION DES MILIEUX CONTINUS » présente la déformation à laquelle se rattachent le tenseur de déformation de Green Lagrange et celui des taux de déformation. Il introduit ensuite les conditions de compatibilité et d’intégrabilité et enfin celle de l’hypothèse des petites perturbations.

Le chapitre 4, ou « EFFORTS OU CONTRAINTES DANS LES MILIEUX CONTINUS DEFORMABLES » donne les outils d’analyse des contraintes puis introduit la notion de tri-cercle de MOHR qui est une représentation de l’état des contraintes en un point d’un milieu continu.

Le chapitre 5, ou « EQUATIONS GENERALES DE LA MECANIQUE DES MILIEUX CONTINUS DEFORMABLES » en partant des quatre principes de conservation que sont celui de la masse, de la quantité de mouvement, du premier et du second principes de la thermodynamique développent des équations générales locales ou intégrales qui permettent un développement ultérieur de la mécanique des fluides, du calcul des structures et des transferts thermiques ou de la thermodynamique des processus irréversibles.

Le chapitre 6 ou « LOIS DE COMPORTEMENT DES MILIEUX CONTINUS DEFORMABLES » présente les comportements des solides élastiques linéaires et des fluides newtoniens visqueux ou non, compressibles ou incompressibles.

Les annexes 1 et 2 donnent respectivement un formulaire de l’analyse tensorielle et les éléments de l’algèbre linéaire si indispensables en Mécanique des milieux continus.
"

In this thesis two buildings, with the same standings, designed in cement block and cut lateritic... more In this thesis two buildings, with the same standings, designed in cement block and cut lateritic blocks (BLT) are studied. We devoted the first part to building materials bibliography and heat transfer phenomena in building. The second part focused on the instrumentation of two unoccupied buildings and the BLTs thermophysical and mechanical characterization. In the third part, a model was designed base on TRNSYS 16 to describe the hygrothermal behavior of the BLT habitat with building characteristics data and metrological data from the Sandia method. We were able to show that using the BLTs makes it possible to approach thermal comfort in the building by combining thermal natural ventilation draft with a small use of air conditioning load which contributes to reducing energy consumption. We then evaluated the hygrothermal and energetic behavior of the building built in BLT base on dynamic thermal simulation tool (STD) TRNSYS 16 with simplifying assumptions. The model calibrated on TRNSYS 16 and validated with the quality indicators, made it possible to optimize the envelope of the BLT walls, to characterize the influence of insulation on the thermal behavior of the uninhabited building and then to evaluate the thermal loads in an occupancy scenario according to the construction materials and the thickness of the walls. The results show that there is an optimal BLT thickness (37.5 cm) together with an average annual temperature of 31.8°C around which there is a downward trend in indoor temperatures in the building. In addition, the study of the optimization of the envelope thickness (37.5 cm) in BLT with internal thermal insulation (ITI) and external thermal insulation (ITE) shows an average phase shift of 1 to 2 hours and rated internal temperatures dumping between 0.14% and 16.05% depending on the type and thickness of ITI and ITE. Finally, in a BLT building with an occupancy scenario, there is a halving of the heat gain for walls from 15 cm to 37.5 cm thick. The average overall thermal gain is estimated at 0.308 kW/m²/month and 33.24 kW/year when the building is constructed with the optimal BLT thickness. This shows that the thermal behavior of the building can be optimized according to the intended use.

Despite the development of sectors aiming of valorizing recyclable materials, landfills remain es... more Despite the development of sectors aiming of valorizing recyclable materials, landfills remain essential in integrated waste management. The construction of such infrastructures is an engineering challenge that must be proven over the long term. The purpose of this study is to understand the modification of the hydromechanical properties of clayey soils constituting the bottom liners that may occur during their operation under the action of leachates. To do so, on the basis of their parameters of nature, four clayey soils were selected among seven soils from different localities in Burkina Faso. Permeability tests with water as interstitial fluid conducted on compacted soils and suspensions confirmed their sealing potential, hydraulic conductivities being less than 10-9 m/s. By contrast, sediments (wastewater treatment sludge) t the permeability requirements. However, the addition of 20% of soil from Nouna, containing smectite, reduces the permeability below the regulatory threshold. The synthetic leachate formulated in the scope of this work containing Volatile Fatty Acids (VFAs), major mineral compounds and heavy metals, significantly alters the permeability of soils, unlike real leachates of lower ionic strength from Waste Treatment and Valorization Center of Ouagadougou. The mechanical properties of soils are also modified. Rheological tests have also been conducted for a rheological characterization of clayey suspensions. The rheological tests confirm the results of the shear tests on compacted soils. They lead qualitatively to the same results as mechanical tests on specimens compacted from the point of view of shear strength. Leachate seem to work in the direction of the stability of the barrier because the shear strength increases. The results of the compressibility tests are more nuanced. VFAs contained in the synthetic leachate increase the settlements of Nouna clay for which the compressibility index varies from 0.164 to 0.225. Leachate results in a decrease in Nouna clay swelling from 12.05% to 5.75% of the initial soil volume. For the soil of Boudry, the opposite effect occurs and the swelling does not seem to be altered. It appears that the modifications of the hydromechanical behavior are related to the mineralogical nature of the clays, to the chemical nature of the leachates and are explained by the theory of the diffuse double layer. The "suspension test" (filter press tests and rheological tests) approach widely used in this work is fast and provides similar results to those conducted on compacted soils

Moreover, the results of the simulation with TRNSYS have shown that the BTC formulated material o... more Moreover, the results of the simulation with TRNSYS have shown that the BTC formulated material offers better thermal performance compared to BLT and cinder block.