气泡混合轻质土干湿循环和硫酸钠耐久性试验研究

采用水泥和地聚合物作为固化剂制备气泡混合轻质土，测试水泥轻质土（LCSC）和地聚合物轻质土（LGSC）在干湿循环和硫酸钠长期浸泡环境下的无侧限抗压强度和质量变化率，并相互进行对比，分析干湿循环级数和硫酸钠浸泡环境对其强度特性的影响规律。结果表明，标准养护地聚合物轻质土强度约为水泥轻质土的2倍；干湿循环后地聚合物轻质土强度随干湿循环级数衰减较快且破坏程度逐渐增大，水泥轻质土强度未出现明显衰减，与水泥轻质土相比，地聚合物轻质土抗干湿能力较差；硫酸钠溶液浸泡120 d后，地聚合物轻质土强度出现小幅下降，约为标准养护28 d试样的80%；水泥轻质土出现开裂破坏，与水泥轻质土相比，地聚合物轻质土抗硫酸钠侵蚀能力较强。

A durability experimental study of lightweight soil subjected to wetting-drying cycles and sodium sulfate soaking

In this study, cement and geopolymer are added to lightweight soil as binders. For the purpose of comparison, unconfined compressive strength test is conducted to evaluate the effects of wetting-drying cycles and sodium sulfate soaking on the strength properties of lightweight cement stabilized clay(LCSC) and lightweight geopolymer stabilized clays(LGSC). The change of unconfined compressive strength and mass loss with wetting-drying cycles and sodium sulfate soaking are discussed. The results show that the values of unconfined compressive strength of LGSC are 2 times that of LCSC under the standard curing condition. Upon wetting-drying cycles, the unconfined compressive strength of LGSC decreases more rapidly than that of LCSC. Compared with LCSC, the wetting-drying durability of LGSC is weaker. After sulfate solution soaking for 120 days, unconfined compressive strength of LGSC declines slightly. However the surface of LCSC cracks. Compared with LCSC, the wetting-drying durability of LGSC is stronger.