摘要
选择截面为圆形、三角形、三叶形3种聚丙烯(PP)纤维增强水泥砂浆,采用平板约束法、荧光分析技术和单根纤维拔出实验,分别研究PP纤维增强砂浆的抗塑性开裂性能、纤维分散性能和纤维/基体界面粘结性能。结果表明:当纤维长度、当量半径和体积掺量相同时,异形截面PP纤维提升砂浆抗塑性开裂性能的效果优于圆形截面PP纤维;与圆形截面PP纤维相比,三角形和三叶形截面PP纤维的纤维有效利用率分别提高了17.65%和29.41%,比表面积分别提高了28.6%和37.1%,纤维/基体的界面剪切强度分别提高了3.4%和8.9%;纤维的分散性、比表面积和纤维/基体界面剪切强度的提高是异形截面PP纤维有效提高砂浆的抗塑性开裂能力的主要原因。
The anti-plastic cracking property of cement mortar reinforced with circular,triangular or trilobal polypropylene（ PP） fiber,the fiber dispersion and the fiber/matrix interfacial bond property were studied by flat restraint test,fluorescence spectrometry and single-fiber pull-out test. The results showed that as compared with circular PP fiber,the profiled PP fibers contributed the better anti-plastic cracking property to the cement mortar at the same fiber length,equivalent radius and volume fraction,and the triangular and trilobal PP fibers had the growth of 17. 65% and 29. 41% in the effective utilization,28. 6% and37. 1% in the specific surface area,3. 4% and 8. 9% in the fiber / matrix interfacial bond property,respectively; and the better anti-plastic cracking property of profiled PP fiber-reinforced cement mortar relied on the growth of the fiber dispersion,specific surface area and fiber / matrix interfacial bond property.
出处
《合成纤维工业》
CAS
2016年第2期22-25,共4页
China Synthetic Fiber Industry
基金
国家自然科学基金重点项目(51438003)
江苏省科技计划青年基金项目(BK20141012)
六大人才高峰项目(2013-JZ-003)
关键词
聚丙烯纤维
异形纤维
水泥砂浆
抗塑性开裂性能
polypropylene fiber
profiled fiber
cement mortar
anti-plastic cracking property
