青海地区改性夯土材料抗压性能试验研究

为改善传统夯土墙的力学性能,使用青稞秸秆、石子、聚乙烯醇、固化剂、防水剂对夯土进行改性,通过对改性夯土试件进行无侧限抗压试验,分析改性试件的抗压强度、荷载-位移曲线。结果表明,添加青稞秸秆可以改善夯土试件脆性破坏的特性;夯土中掺入0.25%青稞秸秆、20%石子和0.8%固含量的聚乙烯醇时,改性试件的抗压强度比素土试件提高了6.89倍,峰值荷载时对应的峰值位移较素土试件增加了1.58倍,试件成型较好,可作为最优配合方案使用。

Experimental study on compressive properties of modified rammed earth materials in Qinghai

In order to improve the mechanical properties of the traditional rammed earth wall, the rammed earth is modified with highland barley straw, gravel, polyvinyl alcohol, curing agent and waterproofing agent. The unconfined compressive test of the modified rammed earth specimen is carried out, and the compressive strength and loaddisplacement curve of the modified specimen are analyzed and discussed. The test shows that adding highland barley straw can improve the brittle failure characteristics of rammed soil samples. When 0.25% highland barley straw, 20% gravel and 0.8% polyvinyl alcohol are added into rammed soil, the compressive strength of the modified specimen is 6.89 times higher than that of the plain soil specimen, and the corresponding peak displacement at peak load is 1.58 times higher than that of the plain soil specimen. The specimen is well formed and can be used as the optimal matching scheme.