纺织纤维改性黏土的力学性能  

Mechanical Properties of Textile Fiber Modified Clay

作　　者：曹林涛[1] 任红丽 左俊朝 杜群乐[3] 

机构地区：[1]湖北文理学院建筑工程学院,湖北襄阳441053 [2]邢台市邢衡高速公路管理处,河北邢台054000 [3]河北省交通运输厅公路管理局,河北石家庄050051

出　　处：《建筑材料学报》2014年第1期110-114,共5页Journal of Building Materials

基　　金：河北科技厅计划外项目

摘　　要：利用废旧衣物制备了2种纺织纤维改性黏土.通过直接剪切试验、加州承载比(CBR)试验以及特设的环刀贯入试验研究了纺织纤维改性黏土的力学性能.结果表明:由于棉质纤维吸收水分,棉质纤维改性黏土水平向抗剪强度明显低于素土;当化学纤维含量(质量分数)为1.0%时,化学纤维改性黏土水平向抗剪强度较素土显著提高;棉质纤维改性黏土环刀贯入阻力在棉质纤维含量(质量分数)为0.6%时达到峰值,化学纤维改性黏土环刀贯入阻力随化学纤维含量增加呈单边增长趋势;棉质纤维改性黏土比化学纤维改性黏土发生更大的吸水膨胀;伴随纺织纤维的适量植入,改性黏土的CBR值较素土有所提高;为减少吸水膨胀量,需要对改性黏土增强压实,相比于棉质纤维,化学纤维更能改善黏土的力学性能.Two types of textile fiber modified clay were prepared with used clothing. Through direct shear tests, California bearing ratio（CBR） tests and specifically designed ring cutting tests, mechanical proper- ties of textile fiber modified clay were studied. The test results show that the horizontal shear strength of cotton fiber modified clay is significantly lower than that of plain clay due to the water absorption of cotton fiber. When the fiber content is 1.0%（by mass）, the horizontal shear strength of chemical fiber modified clay witnesses a notable increase. When the fiber content is 0.6%（by mass）, the cutting resistance of cot- ton fiber modified clay reaches the peak point. In contrast, the force of chemical fiber modified clay shows the monotonically increase with the increase of the fiber content. Larger water absorptive swelling will oc- cur in cotton fiber modified clay, compared with that of chemical fiber modified clay. The CBR value of textile fiber modified clay slightly increases with a small amount of fiber added. In order to reduce water absorptive swelling, the additional compaction should be done on textile fiber modified clay. In short, the chemical fiber behaves more suitable for modification of clay than the cotton fiber in terms of mechanical properties.

关 键 词：纺织纤维 黏土 剪切试验 加州承载比(CBR)试验 

分 类 号：TU521.3[建筑科学—建筑技术科学]