İnşaat Mühendisliği
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Browsing İnşaat Mühendisliği by Subject "Aggregates (Building materials)"
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Item An investigation of perlite as structural lightweight conrete(Thesis (M.S.) - Robert College. Faculty of Graduate School of Engineering, 1965., 1965.) Günerman, Halûk.; Kocataşkın, Ferruh.Item An investigation of the elastic properties of cement-lightweight aggregate (perlite)-and sand mortars(Thesis (M.S.) - Robert College. Faculty of Graduate School of Engineering, 1965., 1965.) Erdem, Ömüral.; Kocataşkın, Ferruh.Item Determination and assesment of shear strength parameters of sand with tire waste inclusions(Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2007., 2007.) Ayhan, Volkan.; Edinçliler, Ayşe.; Baykal, Gökhan.Using tire wastes as lightweight material in constructions is a good alternative to benefit them rather than disposing as waste. Thus, many economical, environmental and technical advantages are gained. To use tire wastes as construction materials, they are processed and different sizes of tire wastes are produced. Until now many studies have been done but it is still not very clear about the shear strength parameters and characteristics of tire wastes. The objective of this study is to investigate the possibility of using tire wastes to reinforce sand. Large-scale direct shear tests were conducted on the mixtures of dry sand, tire crumb and tire buffings. The following factors were studied to evaluate their influence on shear strength; normal stress, tire waste shape and tire waste content. On the basis of experimental results, it is seen that the inclusion of tire waste to the sand increased the shear strength parameters.Item Effects of alkali-carbonate rock reactions on performance of concrete(Thesis (M.S.) - Robert College. Faculty of Graduate School of Engineering, 1969., 1969.) Erman, Burak.; Tümay, Mehmet.Item Mechanical properties of lightweight concrete made with fiber reinforced fly ash pellets(Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2012., 2012.) Yıldırım, Hasan.; Özturan, Turan.In this study, an extended experimental programme was conducted to investigate some physical and mechanical properties of lightweight concretes (LWCs) made with cold bonded fiber reinforced fly ash pellets and also tire chips as coarse aggregates. Crumb rubber and polypropylene fiber were used to reinforce the fly ash pellets. Lightweight concretes were investigated in two groups, namely lightweight aggregate concrete (LWAC) and lightweight rubberized concrete (LWRC) that contained both LWA and tire chips. Totally, 17 lightweight concrete (LWC) mixtures were produced with lightweight aggregates (LC, L1P, L5P and L1F) and tire chips at 0.40 w/c ratio and tested for mechanical properties such as compressive and splitting tensile strength, modulus of elasticity and so on. The findings of the study revealed that the compressive strength values of all LWAC series conformed to the limitation for structural use. The use of LWA and tire chips in concrete mixtures had negative effect on the basic engineering properties compared to the full use of crushed stone as coarse aggregate. The strength loss of LWAC and LWRC can be accounted firstly for the weakness of lightweight fly ash aggregate compared to the mortar phase and normalweight coarse aggregate and secondly for the adherence problem existing between tire chips and matrix zone of lightweight concrete with cold bonded pellets and for the extra void entrapped by tire chips, respectively. However, bond strength increased with no trend when LWA and crushed stone were used together in an equal part as coarse aggregate by volume. This positive contribution of LWAs may be accounted for a better coherence and interlocking of the LWA with the surrounding concrete those minimize the cracking and so utilize the adhesion between the concrete and rebar. When the concrete series with full use of different LWAs as coarse aggregates are compared to each other, it is seen that average flexural strength, failure impact energy and fracture toughness of L1F(4-16) type concrete series were the highest that may be attributed to the extra adherence between polypropylene fiber reinforced pellets and matrix phase by the help of polypropylene fibers existing on the surface of aggregates. Besides, the use of tire chips with LWA in an equal part of coarse aggregate by volume had a positive effect to increase toughness due to energy absorbing capacity.Item Numerical modelling of inelastic behavior of reinforced concrete elements considering cracks and bond(Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 1993., 1993.) Türk, Ahmet Murat.; Karakoç, Cengiz.During the last 25 years, the use of the finite element method in structural engineering area has provided a powerful tool for engineers that has very wide applicability. This method also can be applicable to reinforced concrete members and structures. To be able to use finite element method for the concrete, the behavior of concrete must be modelled numerically, considering concrete cracking, tension stiffening, multiaxial material characteristics, interface behavior, bond properties and other effects. In this study, interface behavior of concrete is studied, and a finite element program is developed. Aggregate interlock mechanism that is the concrete to concrete interface shear transfer mechanism, is studied using Gambarova Karakoç formulations. A new concept, shear retention factor which is supposed to take account of the reduction of the shear stiffness of concrete elements by cracking, is analyzed and by making use of the Karakoç formulations, an original formulation is proposed. The results of the analysis performed in this study are compared with the experimental results obtained by various researchers.Item Structural lightweight aggregate concrete(Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 1993., 1993.) Çevik, Mehmet.; Yerlici, Vedat A.The scope of this thesis is to discuss the use of structural lightweight aggregate. concrete and examine its potentials of utilization in Türkiye. The methods of production, the types, and the characteristics of lightweight. aggregates used for structural purposes are presented. Production and main properties of concrete made of these aggregates are surveyed. The unit price of this concrete is higher than that of normal weight concrete; however, the structures employing structural lightweight aggregate concrete may be economical if its advantages are fully utilized. Therefore, the economy of using this material is studied in detail. Types of structures which are likely to benefit most from using lightweight concrete are also reviewed. A general evaluation of investment is made. The availability of raw materials and the appropriate types of structural lightweight aggregates for Türkiye are discussed.