EFFECT OF WATER-BINDER RATIO ON THE MECHANICAL PROPERTIES OF FOAMED CONCRETE

Cement, fly ash and mineral powder were used as the main raw materials, according to the mass ratio 16:3:1,foamed concrete with different content of bubbles was prepared under different water-binder ratio(0.43, 0.5, 0.6) respectively. The uniaxial compression tests for samples were conducted and obtained the stress-strain curve, peak stress of foamed concrete. The change rules of foamed concrete stress-strain curve with different water-binder ratio, the influence of water-binder ratio on compressive strength and elasticity modulus were experimentally researched. The experimental results indicate that the change rules of stress-strain curve of foamed concrete with different water-binder ratio are basically coincide and all foamed concrete do experience four stages under uniaxial compression: close-grained, elasticity, yield, destroy. Water-binder ratio has a big influence on the compressive strength and elasticity of foamed concrete with low porosity, while has a small effect on foamed concrete with high porosity. Though with different water-binder ratio, the relationships between compressive strength, elasticity and porosity are exponential with porosity.