Measuring Thermal Mass of Sustainable Concrete Mixes

Abstract

Nowadays. the popularity of sustainable concrete construction is increasing every passing year. The purpose of the construction industry is to increase the life of the residence by lowering C02 emissions and to increase the use of natural resources. Examination of thermal mass can be used to prevent or minimize temperature swings in the building and can be used to eliminate the need for energy consumption. Thermal mass rrduces the risk of overheating in the summer and provides passive heating in the winter. Thermal mass is currently evaluated with '•admittance" that is the ability of the element to exchange heat with the environment and is based on specific heat capacity, thermal conductivity and density. The aim of this study is to evaluate the effect of thermal properties namely. density. specific heat capacity and thermal conductivity on thermal mass of concrete. In order to evaluate the effect of such thermal properties, different types of cement materials (PF A, GGBS. and SF) and various types of aggregates (NA and RCA) are used. Additionally. water-cement ratio is investigated. Once thermal properties are found, them1al dynamic properties are calculated theoretically for each sample. These calculations lead an understanding on the effects of different types of cement materials. recyrled coarse aggregate and water-cement ratio of the concrete mixes on the thermal admittance and hence thermal mass.The laboratory tests results were analysed that PF A content concrete mixes were decreased the thermal conductivity more than other type of cements content mixes (such as SF and GGBS).30% PF A content in concrete mix has greater reduction thermal conductivity of the concrete mix. On the other hand, 15 % SF was decreased the them1al conductivity equal percentage (6.5%) with 55% GGBS content concrete mix. The laboratory results are shown that 10 and 20% SF conten1 concrete has greater specific heat capacity than 10 and 20% PF A content concrete. 65% GGBS content concrete mix has greatest specific heat capacity of the concrete mix than all of the mixes. When 30% natural aggregate is replaced by recycled

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