Yin Chenglong, Zhang Wei, Jiang Xunli, Huang Zhiyi
College of Civil Engineering and Architecture, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, China.
Materials (Basel). 2018 Oct 10;11(10):1933. doi: 10.3390/ma11101933.
Initial water content significantly affects the efficiency of soil stabilization. In this study, the effects of initial water content on the compressibility, strength, microstructure, and composition of a lean clay soil stabilized by compound calcium-based stabilizer were investigated by static compaction test, unconfined compression test, optical microscope observations, environment scanning electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction. The results indicate that as the initial water content increases in the range studied, both the compaction energy and the maximum compaction force decrease linearly and there are less soil aggregates or agglomerations, and a smaller proportion of large pores in the compacted mixture structure. In addition, for specimens cured with or without external water supply and under different compaction degrees, the variation law of the unconfined compressive strength with initial water content is different and the highest strength value is obtained at various initial water contents. With the increase of initial water content, the percentage of the oxygen element tends to increase in the reaction products of the calcium-based stabilizer, whereas the primary mineral composition of the soil-stabilizer mixture did not change notably.
初始含水量对土壤稳定化效率有显著影响。在本研究中，通过静力压实试验、无侧限抗压试验、光学显微镜观察、环境扫描电子显微镜、能量色散X射线光谱和X射线衍射，研究了初始含水量对复合钙基稳定剂稳定的粉质黏土的压缩性、强度、微观结构和成分的影响。结果表明，在所研究的范围内，随着初始含水量的增加，压实能量和最大压实力均呈线性下降，压实混合料结构中的土壤团聚体或结块减少，大孔隙比例减小。此外，对于有或无外部供水养护且压实程度不同的试件，无侧限抗压强度随初始含水量的变化规律不同，在不同的初始含水量下均可获得最高强度值。随着初始含水量的增加，钙基稳定剂反应产物中氧元素的百分比趋于增加，而土-稳定剂混合物的主要矿物成分没有明显变化。
