摘要
利用数字图像(DIC)技术来评估纤维表面改性(碱处理、酸处理及硅烷偶联剂处理)和纤维掺量(0%,0.25%,0.5%,1%)缓解水泥固化高含水量软土路基干缩开裂的特性,并量化和比较干缩过程中试样表面的应变、裂缝长度及裂缝面积,从而评估纤维表面改性和掺量对裂缝的限制程度。此外,还测量了干缩过程中试样的水分变化,以加深对干缩行为的了解,并运用SEM和压汞法揭示纤维改性加固水泥土的机理。结果表明,纤维改性能有效降低试样表面的最大拉伸和压缩应变、裂缝长度及裂缝面积,其中,经硅烷偶联剂改性的纤维能够显著降低试样干缩开裂的程度,从而为工程实践提供了理论依据。
In this paper,digital image correlation(DIC)technology was used to evaluate the properties of fiber surface modification(alkali treatment,acid treatment,and silane coupling agent treatment)and fiber content(0%,0.25%,0.5%,and 1%)to alleviate desiccation cracks of cement stabilized soft soil subgrade with high water content.The strain of specimen surface,the crack length,and the crack area during drying shrinkage process were measured and compared with those of unmodified specimens,so as to access the degree of restriction of fiber surface modification and fiber content on cracks.In addition,the moisture change of the specimens during drying shrinkage process was tested to increase the understanding of the drying shrinkage behavior,and SEM and mercury intrusion porosimetry were used to reveal the mechanism of fiber modifying and reinforcing soil-cement.The results show that the fiber modification effectively reduced the maximum tensile strain and compression strain on the surface of specimens,the crack lengthy and the crack area,and the fiber modified by silane coupling agent effectively reduced the degree of desiccation cracks of specimens,which provides a theoretical basis for engineering practice.
作者
徐亚星
姚鑫
庄妍
胡顺磊
董晓强
XU Yaxing;YAO Xin;ZHUANG Yan;HU Shunlei;DONG Xiaoqiang(College of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China;College of Civil Engineering, Southeast University, Nanjing 211189, China)
出处
《太原理工大学学报》
CAS
北大核心
2022年第1期140-148,共9页
Journal of Taiyuan University of Technology
基金
国家自然科学基金资助项目(51978438)。
关键词
PP纤维
表面改性
水泥土
干燥收缩
DIC
PP fiber
surface modification
soil-cement
desiccation cracking
DIC
