高分子材料SH改性夯土水敏性试验  

Experimental study on the water sensitivity of rammed earth modified with polymer material SH

作　　者：孔祥超 和法国[1] 周瑾 陆腾飞 张理智 吕雪梦 KONG Xiang-chao;HE Fa-guo;ZHOU Jin;LU Teng-fei;ZHANG Li-zhi;LV Xue-meng(Key Laboratory of Mechanics on Disaster and Environment in Western China with the Ministry of Education,School of Civil Engineering and Mechanics,Lanzhou University,Lanzhou 730000,China;China Water Resources Beifang Investigation,Design and Research Co.,Ltd.,Tianjin 300000,China)

机构地区：[1]兰州大学土木工程与力学学院,西部灾害与环境力学教育部重点实验室,兰州730000 [2]中水北方勘测设计研究有限责任公司,天津300000

出　　处：《兰州大学学报(自然科学版)》2025年第1期118-124,128,共8页Journal of Lanzhou University(Natural Sciences)

基　　金：国家重点研发计划项目(2023YFF0905901)。

摘　　要：为研究SH材料对夯土水敏性的影响,对压实度为88%、93%、99%的夯土,选取w(SH)为0、0.2%、0.4%、0.6%、0.8%五个梯度进行龄期、声波、渗透、吸水及崩解试验;利用扫描电子显微镜观察不同压实度及w(SH)试样的微观结构,对试验结果进行辅助分析.结果表明,试样28 d内已基本结束水分蒸发并完成内部结构增强;SH材料对低压实度试样的抗渗能力提高效果更显著;不同压实度及w(SH)试样的渗透系数与纵波波速之间相关性良好;相比压实度,在抑制夯土水敏性方面SH材料表现出更优的效果;当w(SH)≥0.4%,压实度≥93%时,试样水敏性明显减弱;SH材料通过填塞内部孔隙、增强颗粒联结及疏水基团斥水作用有效改善了夯土水敏性.In order to investigate the impact of SH material on the water sensitivity of rammed earth,five w(SH)levels(0,0.2%,0.4%,0.6%,and 0.8%)were tested on rammed earth samples with compaction rates of 88%,93%,and 99%,conducting aging,ultrasonic,permeability,water absorption,and disintegration tests.The microstructure of samples with various compaction rates and SH solid contents was observed using scanning electron microscopy,aiding in the interpretation of the experimental results.The results indicate that the moisture evaporation in the samples was nearly complete within 28 days,and the internal structural reinforcement was achieved.The improvement in impermeability of low-compaction samples was more pronounced with the addition of SH materials.A good correlation was observed between the permeability coefficient and P-wave velocity in samples with varying compaction levels and SH solid contents.SH materials demonstrate better efficacy in mitigating water sensitivity in rammed earth than compaction.When w(SH)≥0.4%and compaction degree reaches≥93%,the water sensitivity of the samples is noticeably reduced.SH materials improve the water resistance of rammed earth by filling internal voids,enhancing particle connections,and utilizing hydrophobic groups to repel moisture.

关 键 词：夯土 SH材料 压实度 纵波波速 水敏性 扫描电子显微镜 

分 类 号：TU43[建筑科学—岩土工程]