稻草纤维增强泡沫混凝土物理力学性能试验研究OA北大核心CSTPCD

In order to study the properties of straw fiber reinforced foam concrete,fiber-reinforced foam concrete was prepared by the physical foaming method with ordinary Portland cement as the main cementitious material,silica fume,metakaolin and fly ash as the supplementary cementitious materials,and rice straw fiber as reinforcement material.The effects of straw fiber content on the density,water absorption,compressive strength,flexural strength,splitting tensile strength and frost resistance of foam concrete were investigated by full factorial tests at different water-to-binder ratios and foaming agent dosages.The results showed that the density,compressive strength and splitting tensile strength of straw fiber reinforced foam concrete increased first and then decreased with the increase of fiber content for different water-to-binder ratios and foaming agent dosages.The compressive strength increased with density as a power function.The splitting tensile strength increased exponentially with the increase of compressive strength.When the water-to-binder ratio was 0.45,the flexural strength increased first and then decreased with the increase of fiber content.When the water-to-binder ratio was 0.50,the flexural strength increased with the increase of fiber content.The incorporation of fiber increased the pore size and water absorption rate of foam concrete,and reduced its frost resistance.