河南城建学院学报2024，Vol.33Issue(2)：1-6,42,7.DOI:10.14140/j.cnki.hncjxb.2024.02.001
水泥-微硅粉改良膨胀土工程特性试验研究
Experimental study on engineering properties of cement-microsilica fume improved expansive soil
摘要
Abstract
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.关键词
膨胀土改良/水泥-微硅粉/工程特性/微观结构Key words
expansive soil improvement/cement-microsilica fume/engineering properties/microstructure分类
建筑与水利引用本文复制引用
张玉国,秦培森,郭泰,王瑞雪,杜晓玉,杨畅..水泥-微硅粉改良膨胀土工程特性试验研究[J].河南城建学院学报,2024,33(2):1-6,42,7.基金项目
国家自然科学基金(U1204511,51509274) （U1204511,51509274）
河南省自然科学基金项目(222300420596) （222300420596）
河南省高等学校重点科研项目(19A560027) （19A560027）
