Strength Characteristics and Microstructure of Cement Stabilized Soft Soil Admixed with Silica Fume

被引:38
作者
Jiang, Nan [1 ]
Wang, Changming [1 ]
Wang, Zeping [2 ]
Li, Bailong [1 ]
Liu, Yi-ao [1 ]
机构
[1] Jilin Univ, Coll Construct Engn, Changchun 130026, Peoples R China
[2] Changchun Municipal Engn Design & Res Inst, Changchun 130033, Peoples R China
基金
中国国家自然科学基金;
关键词
silica fume; cement stabilized soft soil; unconfined compressive strength; microstructure; pore distribution; COMPRESSIVE STRENGTH; MECHANICAL-PROPERTIES; FLY-ASH; CLAY; DIFFUSIVITY; WORKABILITY; IMPROVEMENT; CONCRETE;
D O I
10.3390/ma14081929
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Soft soil improvement is an important subject in civil engineering, and searching for an effective admixture is an important research. Silica fume (SF) is a kind of recycled material, it can be used in engineering as a pozzolanic material. The main objective of this study is to assess the effectiveness of industrial waste silica fume (SF) as an admixture to improve the cement stabilized soft soil. The unconfined compressive test (UCT) and scanning electron microscopy (SEM) test of cement stabilized soil with different SF contents and different curing times have been carried out. UCT after 28 days revealed that the addition of SF can effectively increase the strength of cement stabilized soil and reduce the amount of cement, and 1.5% SF content is considered optimum, excessive SF will not further increase the strength. SF helped to accelerate the cement hydration reaction and significantly improve the early-age strength of stabilized soil even at 3 days, which can improve construction efficiency in actual projects. SEM analyses shows that the proper SF content could make the hydration product calcium silicate hydrate gel (CSH) fill the pores and increase the strength of the material, but excessive SF will increase the large pores content of the material and reduce the strength. This provided a basis for application of SF in improving soft soil.
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页数:11
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