东南大学学报（自然科学版）Issue(1)：160-164,5.DOI:10.3969/j.issn.1001-0505.2016.01.026
不同截面形状 PP 纤维对砂浆抗塑性开裂的影响及机理
Influences and mechanism of polypropylene fibers with different cross-sections on anti-plastic-cracking of cement mortar
摘要
Abstract
In order to investigate the influences of polypropylene ( PP) fibers with different cross-sec-tions on anti-plastic-cracking of cement mortar, the restrained plat test, fluorescence spectrometer and scanning electron microscope were used to study the plastic cracking of cement mortar, fiber dispersion and fiber/matrix interface morphology, respectively.The results show that the cement mortar with profiled PP fiber possesses the better anti-plastic-cracking capacity than that with circular PP fiber when the length, equivalent radius and dosage are the same.Compared triangular and trefoil PP fibers with the circular PP fiber, the strengthened ratio of intrinsic flexural rigidity of the former two fibers is increased by more than 20.88%, the specific surface areas are increased by 28.6%and 37.1%, and the effective utilization percentages of fiber dispersion are improved by 17.62%and 30.70%, respec-tively.Furthermore, the fiber/matrix interface becomes more compact and more hydration products are adhesive to the fiber surface.The intrinsic flexural rigidity, fiber dispersion, specific surface area and fiber/matrix interface bond are the key factors for profiled PP fibers to improve the anti-plastic-cracking performance of the cement mortar.关键词
聚丙烯纤维/截面形状/塑性开裂/砂浆Key words
polypropylene fiber/cross-section/plastic cracking/mortar分类
建筑与水利引用本文复制引用
张丽辉,刘建忠,阳知乾,徐德根,李林..不同截面形状 PP 纤维对砂浆抗塑性开裂的影响及机理[J].东南大学学报（自然科学版）,2016,(1):160-164,5.基金项目
国家自然科学基金重点资助项目（51438003）、江苏省科技计划青年基金资助项目（BK20141012）、江苏省“六大人才高峰”资助项目（2013-JZ-003）． （）
