Browsing by Author "Çağlar H."

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An investigation of the effect of PVA and boric acid on concrete mixtures
(2018-01-01) Çağlar H.; Yazıcıoğlu S.; Uslu İ.; Çağlar A.; Uslu M.L.
In this study, we investigate the effect of the addition of poly vinyl alcohol (PVA), a polymer filler, which is known to promote the strength of unit mass, corrosion strength and the flexibility of the final product together with boric acid as a cross linking agent to concrete polymer composites by viscosity, setting time, compressive and bending strength tests in accordance with Turkish standards. The addition of PVA and boric acid caused 4% increase in 28 days’ compressive strength results. The bending strength on the other hand, the bending strength decreased by 45%. The samples were also investigated by scanning electron microscope (SEM) and X-ray diffraction (XRD) methods. The experiments repeated with higher filler concentrations showed that porosity of the final concrete was significantly decreased resulting a much higher quality end product.
Investigation of the mantle system applied to outer shell of apartment buildings in terms of energy efficiency (erzincan case)
(2018-01-01) Çağlar A.; Çağlar H.; Koçu N.; Yazıcıoğlu S.
Energy is a phenomenon that leads to conflicts, internal conflicts, and antagonism in all areas of life. Considering that we are dependent on foreign countries in the field of energy, the conservation of energy is getting more and more important day by day. A large portion of the energy consumed in Turkey is used to heat houses. It is very important to maintain the heat and keep it on the field as well as to heat the house. It is seen that the best and economical way of keeping the heat is thermal insulation in the apartments. In this study, five apartments in Erzincan which is in the 4th grade climate zone, have been heat insulated by using the mantle system according to TS 825. The annual energy requirement is calculated in the case of heat losses which occur in case of heat insulation and without heat insulation. As a result, it has been determined that the energy efficiency will increase if the apartments are heat insulated. It is also stated that the workmanship is important in heat insulation.
Particle swarm optimization based approach for estimation of costs and duration of construction projects
(2020-02-01) Khalaf T.Z.; Çağlar H.; Çağlar A.; Hanoon A.N.
Cost and duration estimation is essential for the success of construction projects. The importance of decision making in cost and duration estimation for building design processes points to a need for an estimation tool for both designers and project managers. Particle swarm optimization (PSO), as the tools of soft computing techniques, offer significant potential in this field. This study presents the proposal of an approach to the estimation of construction costs and duration of construction projects, which is based on PSO approach. The general applicability of PSO in the formulated problem with cost and duration estimation is examined. A series of 60 projects collected from constructed government projects were utilized to build the proposed models. Eight input parameters, such as volume of bricks, the volume of concrete, footing type, elevators number, total floors area, area of the ground floor, floors number, and security status are used in building the proposed model. The results displayed that the PSO models can be an alternative approach to evaluate the cost and-or duration of construction projects. The developed model provides high prediction accuracy, with a low mean (0.97 and 0.99) and CoV (10.87% and 4.94%) values. A comparison of the models’ results indicated that predicting with PSO was importantly more precise.
The investigation of use as aggregate in lightweight concrete production of boron wastes
(2020-07-01) Aldakshe A.; Çağlar H.; Çağlar A.; Avan Ç.
Lightweight concrete manufacture has been aimed as a result of the use of boron waste which is aggregate of pumice, one of our natural resources, and a valuable industrial waste as a substitution material in different proportions (1%, 3%, 5%, 7%, and 9%). As a result of the study, it was aimed to obtain a water-resistant and lighter material which has higher properties than lightweight concrete in terms of physical and mechanical. The study was carried out as three stages. At the first stage, 90% of the pumice aggregate and 10% of the sand (Reference sample) were used and lightweight concrete was produced. At the second stage, boron waste at the rate of 1%, 3%, 5%, 7%, and 9% was used for pumice aggregate and the doped lightweight concrete sample was produced. At the last stage, tests were carried out for the determination of the physical and mechanical properties of lightweight concrete samples which were produced. For determination of mechanical properties, tensile splitting strength and compressive strength tests were performed. Additionally, specific gravity, water saturated unit volume weight, porosity, and capillary water absorption tests were made for the determination of physical diversities. It was found that the physical and mechanical properties of the material improved with the increase of boron waste in the consequence of this study. The best result was obtained with the boron waste substitution at the rate of 9%. Environmentally harmful boron wastes being used in the construction sector will contribute to sustainability by recycling the boron wastes.