聚丙烯酰胺对水泥固化砂土性能的影响

Effect of Polyacrylamide on the Properties of Cement Stabilized Sand

针对传统水泥固化土耐久性较差的特点,通过对加入三种不同吸水性能聚丙烯酰胺(PAM)的水泥固化砂土进行无侧限抗压强度试验、干湿循环试验、干缩试验以及SEM电镜扫描试验,对不同吸水性能的PAM改善水泥固化土的强度、耐久性以及微观机理进行研究分析。试验结果表明:PAM的掺入可有效提高水泥固化土的强度,而PAM吸水性能的不同会导致水泥固化土的强度呈现出一定的规律性变化;PAM的掺入可有效改善水泥固化土的耐久性能,相对而言,强吸水性能PAM对于水泥固化土的耐久性表现出更好的改善作用;PAM掺入水泥固化土后形成PAM-水泥石-土颗粒的整体胶结结构,增强了水泥固化土的强度和抗干缩开裂的能力。

In view of the poor durability of traditional cement solidified soil,the unconfined compressive strength test,dry-wet cycle test,dry shrinkage test and SEM electron microscope scanning test were carried out on the cement solidified sand with three different water absorption properties of polyacrylamide(PAM).The strength,durability and microscopic mechanism of PAM with different water absorption properties to improve cement solidified soil were studied and analyzed.The test results show that the incorporation of PAM can effectively improve the strength of cement solidified soil,and the different water absorption properties of PAM will lead to a certain regular change in the strength of cement solidified soil.The incorporation of PAM can effectively improve the durability of cement stabilized soil.Relatively speaking,the strong water absorption PAM shows a better impact on the durability of cement stabilized soil.After PAM is mixed with cement solidified soil,the overall cementation structure of PAM-cement stone-soil particles is formed,which enhances the strength and dry shrinkage cracking resistance of cement solidified soil.