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Öğe Investigation of the thermal and acoustic performance of perlite- based building materials(European Journal of Technique (EJT), 2016-12) Oktay, Hasan; Argunhan, Zeki; Doğmuş, RecepPerlite is a siliceous volcanic glass that provides heat and sound insulation, whose volume can expand substantially under the effect of heat. Perlite ore is one of the most important mineral resources for Turkey where holds a large portion reserves in the world. Evaluation of perlite in building industry, which has advantages in terms of heat and sound insulation, will make an important contribution to the national economy. In this context, experimental investigations are performed for obtaining new concrete types with relatively high strength, low density and good thermal and acoustic properties for energy efficient buildings. For this purpose, 6 sets and different types of concrete samples were prepared with a constant watercement ratio, and normal aggregates replaced by expanded perlite aggregates at different volume fractions such as 10%, 20%, 30%, 40%, 50% and 60% of the total aggregate volume. Mechanical and thermal tests were all conducted and the hot disk method was used to establish thermal property values of concrete samples. The results of the experimental studies show that the compressive strength and density decreases, while highly increases the heat and sound insulation features with increasing in perlite content. As a result, it was found out that the reductions in thermal conductivity [Wm–1K–1] and ultrasonic pulse velocity [km/s] of the produced samples reached to 75% and 35%, respectively.Öğe Investigation of mechanical properties of lightweight concretes with different lightweight aggregates(Dicle University, 2019) Oktay, Hasan; Aydın, Hüseyin; Işık, Mehmet Zerrakki; Argunhan, ZekiEngineers have to know mechanical characteristics of lightweight concretes which are better than normal concretes. In this study, experimental investigations are performed for obtaining new concrete types to investigate the effect of lightweight aggregates on mechanical properties and to evaluate the relationships between the measured values of these properties. For this purpose, different types of concrete samples were prepared with a constant w/c, and normal aggregates replaced by lightweight aggregates such as pumice, expanded perlite and rubber aggregates at different volume fractions such as 10 %, 20 %, 30 %, 40 % and 50 % of the total aggregate volume. 102 samples were produced, and their mechanical characteristics were tested in accordance with ASTM and EN standards. Moreover, in order to evaluate possible correlations among the tested properties, a multivariate regression analysis was performed. Based on the experimental results, the expressions are presented to determine the relation between the mechanical properties of concrete samples. The results showed that both the compressive strengths and bulk densities of lightweight concrete samples decreased with increasing the (%) percentage of lightweight aggregate content. In addition, the regression analysis results show that if one of the mechanical properties of a structure is known, the other important properties can be calculated easily utilizing those expressions.
