RESEARCH ON MECHANICAL PROPERTIES OF FLY ASH CEMENT SOIL IN YINCHAN

On cement soil pile treatment of high mineralization lake deposits soft clay foundation in Yinchuan, cubetest specimens with 70. 7mm length of each side were prepared by mixing method under natural water content of softsoil and fixed cement content, strength and deformation of test specimens were determined by hydraulic universalmaterial testing machine, microstructure of cement soil with fly ash content, water content, water cement ratio, cement ratio and age was analyzed by SEM. The - relationship and change in strength of high fly ash cement soilwere studied, the rule and mechanism of strength were revealed. Under high fly ash condition, the strength of cementsoil was increased remarkably. Later age strength growth rate was very high. The optimum ratio of fly ash and cementwas about 3. Filling effect and hydration of fly ash were the main mechanism. The relationship between strength andfly ash content, cement water ratio, water content was approximately linear. The linear correlation between strengthand cement water ratio was the best.