Nihal Arıoğlu - Academia.edu (original) (raw)

Papers by Nihal Arıoğlu

World Academy of Science, Engineering and Technology, International Journal of Industrial and Manufacturing Engineering, May 11, 2015

İTÜ dergisi A, 2017

The production of composites materials has gained importance due to the increasing and more compl... more The production of composites materials has gained importance due to the increasing and more complex needs of today. Materials used for composites, where the aim is to produce products that have better properties compared to the components forming the main body, can be composed of products obtained from raw materials or recycled products. By adding PET fibers, which are among recycled products, into the composites, the use of limited raw material resources and the harm to the environment during the processes during the lifecycle of the product is minimized. Additionally, gypsum, which is used as matrix in the composite, is easily obtainable, has adequate raw material resources, is easily given form, produces a clean-flat surface, has sufficient tensile and compressive strength and is a good humidity equalizer and sound regulator. However, gypsum has a low impact strength and toughness value. As it is necessary to increase its impact resistance, some research is carried out to this end. In this study, composite material is produced by adding polyethylene terephthalate fibers that are recycled products manufactured from recycled PET bottles and which have not been tried before and PVA based adherence-enhancing additive into the gypsum matrix to improve the properties of gypsum. Test results show that with the addition of fiber the flexural strength of gypsum has somewhat decreased but the addition of the adherence-enhancing additive has considerably increased the compressive and flexural strength. As expected from fiber reinforced composites, the impact and toughness values of the material has considerably increased. The positive effect of the adherence additive between the gypsum matrix and the fiber is clearly visible in the micro analysis carried out.

Aci Materials Journal, Sep 1, 2006

The discussers note that the authors used empirical equations that do not address the effect of t... more The discussers note that the authors used empirical equations that do not address the effect of the mechanical properties of coarse aggregates on concrete elastic modulus. To address this, the discussers present further knowledge relating to the influence of the elastic modulus of coarse aggregate.

International Journal of Scientific and Technological Research, 2018

Houses meet the basic housing needs of people. While the people meets this basic need, they want ... more Houses meet the basic housing needs of people. While the people meets this basic need, they want the house to be aesthetic, functional, economical and high quality. Quality is handled in a very wide perspective from the design stage until the turnkey is delivered. To prevent possible defects of a production and to raise the existing quality barem in market competition requires a strong and systematic control. In this study; During the rough construction phase, the work flow chart was developed with a systematic approach to how the quality control should be made from the stacking process of the conventional mold manufacturing to the process of dismantling the concrete and the process of dismantling the molds.

Architectural Science Review, Jun 1, 2005

... However, his donation of money to his foundation for the pavements of Istanbul shows the impo... more ... However, his donation of money to his foundation for the pavements of Istanbul shows the importance ... When it came to the maintenance and repair of historical works and monuments, he dealt ... addition to his occupational skill in dome solution, he was a talented water engineer. ...

Bulletin of Engineering Geology and the Environment, Jun 9, 2010

Building and Environment, Sep 1, 2006

Turkey is quite rich with historical buildings. Depending on various factors like time, increasin... more Turkey is quite rich with historical buildings. Depending on various factors like time, increasing air pollution due to technological improvements of the present era together with insufficiency of inspection leads to the formation of damages on these buildings which are part of our historical heritage. Conservation of such buildings which are as important as historical documents should be the first and foremost target of any project. Where maintenance is insufficient, conservation and restoration attempts should replace it. What is necessary in restoration is the use of material which resembles the original material to the closest degree or, producing appropriate material which is compatible with the properties of the original material. The first dimension of the current problem is the insufficiency of resources while the second dimension stems from the lack of proper evaluation of the material to be used in conservation and restoration. This study defines the importance of mortars and plasters along with their history and the reasons of deterioration. In addition, it sets up the information flow of mortar and plaster within a systematic decision making process. The necessary experimental methods for the production of new repair mortar or plaster that can be used in determining the character analysis of original mortar and deterioration morphology are also analyzed. Thus, a method that can be used in the conservation and restoration studies is determined with this paper.

Architectural Science Review, Jun 1, 2006

... Page 5. 147 Preservation and Restoration of the Stones in Historical Buildings Acun & Ari... more ... Page 5. 147 Preservation and Restoration of the Stones in Historical Buildings Acun & Ariglu ... If necessary, samples in homogeneous powder format may be processed into tablets within a solid carbon solution and they can be analysed quantitatively with SEM-EDX. [9] ...

The aim of this study is to give an overview of the reinforced concrete structures increasing rap... more The aim of this study is to give an overview of the reinforced concrete structures increasing rapidly in Turkey and to expose the lack of the demolition practices by pointing out economic, management and organisational aspects relating to deconstruction. For the future economic and ecological conditions in Turkey, today's buildings should be preserved, refurbished, reused or broken down into salvageable and reusable components rather than demolished at the end of their useful life. It is possible that buildings design for deconstruction will have the greatest value. In this study, a deconstruction planning model is developed according to the existing deconstruction system in Turkey and the design processes which constitute this deconstruction planning model are identified and described. Furthermore, to encourage legislatives to design for deconstruction, its supporting goals are such as the rapid removal of the building from the site, reduction in environmental, health and safety stress for workers, easy access to components and materials, material recovery with high efficiency of reuse and recycling and eliminating toxicity in buildings materials are mentioned. As a result, deconstruction, the systematic taking apart of a building for the purpose of materials reuse as opposed to destructive demolition, is not a new concept, but it has not previously been the topic of research in Turkey. This study presents the current state of building deconstruction in Turkey and a deconstruction planning model is developed for the purpose of the future deconstruction activities.

Cement and Concrete Research, Aug 1, 2001

Bu çalışmada; masif ahşap parkelerin geometrik kararlılığı araştırılmıştır. Ahşap parkelerin büny... more Bu çalışmada; masif ahşap parkelerin geometrik kararlılığı araştırılmıştır. Ahşap parkelerin bünyesindeki geometrik değişimlerin incelenmesi amacıyla iki ağaç türünden iki farklı genişlikte elde edilen numunelere ön deney ve deneyler uygulanmıştır. Ön deneylerde numunelerin yoğunluk, radyal ve teğet doğrultuda genişleme ve daralma değerleri belirlenmiştir. Deneylerde numuneler farklı bağıl nem değerlerinde şartlandırılıp geometrik kararlılıkları belirlenmiştir. Bu aşamada numunelerin bir kısmına oluk açılmış, bir kısmı sistire edilip her işlemin ardından tekrar şartlandırılmıştır. Oluk açılmayıp sistire edilmeyen bir numune grubu da ardışık olarak şartlandırılmıştır. Deneylerin ardından numunelerin geometrik değişimleri elde edilen literatür bilgileri ve yapılan istatistiki test bulgularıyla birlikte değerlendirilmiştir. Sonuçta; parkelere oluk açılmasının geometrik kararlılığın iyileştirilmesinde fayda sağlamadığı; fakat sistire edilip ardışık döngülere tabi tutulmasının geometrik ...

In today?s world, choosing the right material without any harmful effect and with high energy eff... more In today?s world, choosing the right material without any harmful effect and with high energy efficiency is an important decision to take for maintaining balance of natural environment. Sustainability of used materials and architectural design are highly important factors for satisfying the natural balance. Considering this wood is appeared as the best material with its uniqueness and special sustainability properties. With developing technologies all around the world, small slices of glued-wood can be used for many purposes, as creating wide-broad areas with produced materials in various kinds of shapes, avoiding wastage of wood. This new usage form of wood is called as glued-layered (laminated) wood in today?s design world. In this study, the main objective is to research and analyze the possibility of beam production by laminated wood technology that had already been used in Europe and in America for many years, but is recently known in Turkey. For achieving this, findings obtain...

World Academy of Science, Engineering and Technology, International Journal of Industrial and Manufacturing Engineering, 2015

For Turkey to reach the goal targeted for 2023 ‘500 Billion Dollar Export’ and to be within the T... more For Turkey to reach the goal targeted for 2023 ‘500 Billion Dollar Export’ and to be within the Top 10 Countries, percentage of the growth rate should exceed 6%. Technological products should be developed and exported for this purpose. Realization of such action can happen by improving the university-industry relationship, by accelerating the Research and Development, and by training and employing technical personnel for R&D. Regarding roof sector the demand for new products are getting as high as the traditional ones. A new roofing product that can fulfill the performance criteria can easily find a place for itself in the foreign market. By modifying existing products or developing new roofing options, producers can increase their share in the foreign market which will also help the national economy. This study explains the process of developing new geomembrane roofing material that can produce energy and can be used on inclined roofs by modifying an existing geomembrane. Data coll...

A/Z : ITU journal of Faculty of Architecture, 2018

In this study, the effect of cyclic relative humidity changes, sanding and grooving on the dimens... more In this study, the effect of cyclic relative humidity changes, sanding and grooving on the dimensional stability of solid wood parquet were evaluated. The experiments were carried out on oak (Quercus petraea) and sapele (Entandrophragma cylindiricum) wood species. Firstly some physical tests (density, shrinkage, and swelling) were carried out on 20×20×30 mm specimens obtained from these two species. After the physical tests the parquet size specimen groups were obtained both in radial and tangential section directions and in two sizes; narrow (250×50×15 mm) and wide (250×90×15 mm). One group of parquet size specimens was sanded and the other group was grooved. There was also a group of specimen for control. After being conditioned to equilibrium moisture content at 65% relative humidity, specimens were placed in a climate chamber and exposed to cyclic relative humidity changes. The dimensions of the specimens were measured between different environmental conditions and the dimensional change was evaluated by taking into consideration the mentioned physical properties. The results show that cyclic relative humidity changes mainly resulted with an increase in the dimensional stability of sanded and cyclic conditioned specimens. There was not a significant change in the dimensional stability of grooved specimens.

ACI Structural Journal, 2007

In this study, the empirical relationships proposed in the current literature were verified to as... more In this study, the empirical relationships proposed in the current literature were verified to assess their validity for compressive strengths between 60 and 132 MPa (8700 to 19,145 psi). A relationship was suggested to predict the ultimate strength of very high-strength concrete under triaxial compression. Furthermore, strength criteria essentially developed to estimate the ultimate strength of intact rock were applied to the concrete. The results of triaxial tests were employed to verify the applicability of these strength criteria for high-strength concrete. It is interesting to note that the strength criteria developed for intact rocks can also be applied to the assessment of ultimate strength and failure curve in high-strength concretes. Knowing only the cylinder compressive strength and the ratio of tensile-to-compressive strength, the failure envelope can be successfully evaluated by means of these criteria without performing triaxial tests in high-strength concretes.

A/Z : ITU journal of Faculty of Architecture, 2017