In order to investigate the effect of aggregate volume ratio (S/A, volume of sand/ volume of total aggregate) on the elastic modulus of lightweight concrete, cylindrical specimens ( 010x200mm) with different S/A ratios and various water-cement ratios were cast and tested. Both single inclusion model and double inclusion model were applied to predict the elastic moduli of two-phase and three-phase cement-based composite materials, respectively. The elastic modulus of lightweight aggregate was obtained based on composite theory models. In this study, the aggregate volume ratio significantly affects the elastic properties of lightweight concrete. The elastic modulus and compressive strength of lightweight concrete increase as S/A ratio increases.

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