首页期刊信息编委及顾问期刊发行联系方式使用帮助常见问题ENGLISH
位置:首页 >> 正文
含裂纹网络水泥基材料的渗透性
作者:李乐 庞晓贇 李克非 
单位:教育部土木工程安全与耐久重点实验室 清华大学土木工程系 北京100084 
关键词:水泥基材料 裂纹网络 本征渗透系数 裂纹宽度 裂纹密度 
分类号:
出版年,卷(期):页码:2015,43(8):0-0
DOI:10.14062/j.issn.0454-5648.2015.08.00
摘要:

 为了研究裂纹网络对水泥基材料渗透性的影响,采用人工制造裂纹再拼接的方法得到不同开裂程度的薄片试件,对开裂试件表面的二维裂纹形貌特征进行了定量分析,包括裂纹的密度、取向、裂纹宽度等。测试了普通混凝土和砂浆材料的等温吸附与脱附曲线,得到两种材料的水分特征曲线。并用水分迁移的多相流模型模拟试件的干燥过程,同时对比干燥实验中不同开裂程度试件的质量变化过程以回归其对应的本征渗透系数。结果表明:裂纹密度大于临界阈值0.3 时,相对渗透系数增加迅速;渗透系数与裂纹的宽度成指数关系,指数为1.945,接近立方定律中渗透系数与宽度的二次方关系。

doxycycline doxycycline doxycycline

In order to investigate theinfluenceofcrack network geometry on the permeability of cracked cement-based materials,cracks were artificiallymadein mortar and concrete slice specimens to obtain a two dimension(2D) crack network. The water vaporsorption isotherms (WVSI) of ordinary concretes and mortars were measured. The intrinsic permeability of specimens with differentlevels of cracking extent was determined via the mean relative mass based on the mass measurement during drying test, the WVSI andwater transport model. The geometry parameters on 2D cracked surface, i.e., crack density, orientation and crack openingaperture,were evaluated . The relationship between the geometry characteristics of crack networks and the relative permeability wereinvestigated. The results show that the crack density has animpact on the increase of the relative permeabilitywhenρis >0.3, whichisrelated to the percolation characteristics of crack networks. The mortar and concrete specimens bothhavea correlation between therelative permeability and crack opening.

abortion pill abortion pill abortion pill
基金项目:
作者简介:
第一作者:李 乐(1987—),女,博士研究生。 通信作者:李克非(1972—),男,博士,教授。
参考文献:
服务与反馈:
文章下载】【加入收藏
中国硅酸盐学会《硅酸盐学报》编辑室
京ICP备10016537号-2
京公网安备 11010802024188号
地址:北京市海淀区三里河路11号    邮政编码:100831
电话:010-57811253  57811254    
E-mail:jccs@ceramsoc.com