为了探讨不同聚土比(地聚合物质量与软土湿土质量之比)和不同龄期下地聚合物加固软土强度的变化规律,设计了10%,12%,14% 3种聚土比,按照7,28,60 d 3个龄期进行直接剪切试验和无侧限抗压强度试验,发现:其强度随着聚土比的增加而提高,同一聚土比下随着龄期延长而提高;当聚土比为14%时,地聚合物处理软土的效果比较好。同时通过SEM扫描和CT扫描试验分析了软土加固后的微观结构特征,并在此基础上对微观结构与宏观性能之间的关系进行了分析。宏观与微观关系是强度越高,结构空隙越少。研究成果为地聚合物加固软土在实际工程中的应用提供了科学依据。

Direct shear test and unconfined compression test are conducted on geopolymer-reinforced soft soil specimens of different curing ages (7 d, 28 d, and 60 d). Ratio of geopolymer mass to soft and wet soil mass (hereinafter referred to as “the ratio”)is designed at three levels: 10%, 12%, and 14%. Results demonstrate that the strength of reinforced soil climbs with the increase of geopolymer dosage; while at a given geopolymer dosage, the strength of reinforced soil also increases with the elongation of curing age. The reinforcement effect is good when the ratio is 14%. Furthermore, the relation between microstructure and macro-properties of reinforced soil is analyzed based on SEM scanning and CT scanning. Results indicate that smaller structural porosity would result in higher strength. The results offer scientific basis for the application of geopolymer-reinforced soft soil inpractical engineering.