Experimental study on engineering properties of cement-microsilica fume improved expansive soil
In order to study the engineering properties of cement and microsilica fume composite modified ex-pansive soil as subgrade filling material,the expansive soil subgrade filler of a road section in Neixiang County,Nanyang City,was taken as the research object,and its expansive and mechanical properties under different cu-ring ages were analyzed through expansion force test,unloaded expansion rate test,unconfined compressive strength test and direct shear test.The mechanism of the improved expansive soil was analyzed by SEM scan-ning test,and the relationship between the change of mechanical properties and the micro-morphology of the improved expansive soil was discussed.The test results show that with the addition of cement and microsilica fume and the increase in curing age,the compressive and shear strength of the soil is increased,and the expan-sion of the improved expansive soil gradually decreases.The effect of composite improvement using two materi-als is particularly significant.Taking into account the effect and economy,the compound is mixed with cement and The optimal dosages of microsilica powder are 7％and 10％ respectively.
国家科技期刊平台
NSTL
万方数据
维普
