中文摘要：

采用无侧限抗压强度、电镜扫描（SEM）和压汞（MIP）等试验方法,分析研究了地聚合物—偏高岭土（metakaolin）对水泥土的力学强度的影响规律,探讨了其改善水泥土强度的机理,并根据现场测试验证了实用性和经济性。试验结果表明：地聚合物掺入水泥土后,水泥土的无侧限抗压强度得到了大幅度的提高,然而强度与地聚合物掺量之间并非单一线性增加关系,而是由活性区域和惰性区域组成,转折点对应的MK掺量为3%;微观试验结果表明地聚合物掺入能产生更多的胶结物,使水泥土结构更加致密;基于试验数据给出了地聚合物掺量与水泥土强度增长的评价公式。现场测试结果和工程造价分析均表明了地聚合物具有较大的工程实用性。

英文摘要：

The unconfined compression shearing tests, scanning electron microscopy（SEM） and mercury intrusion porosimetry（MIP） methods are used to clarify the strength behavior and microstructural evolution of cement-stabilized soils with geopolymer（metakaolin）, and then the in-situ tests are conducted to verify their practicability and economy. The results show that when the geopolymer MK is incorporated into the cement, the strength of cement-stabilized soils is obviously multiplied, and significantly better than that modified just by the pure cement, which means that the strength behavior of cemented soils can be further improved. It should be noted that the strength of cement-stabilized soils does not linearly increase with the mixing ratio of geopolymer; its growth efficiency can be divided into the active and inert zones; and the threshold mixing ratio of MK is 3% in this case. The microstructural analysis shows that the MK incorporation can produce more cementation and make the sample denser. Furthermore, the proposed strength enhancement prediction model also verifies these findings. Finally, the analysis of the in-situ strength and economy also shows its effectiveness and the potential engineering application.