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聚丙烯纤维对混凝土抗拉强度的影响
引用本文:姚武,李杰,周钟鸣.聚丙烯纤维对混凝土抗拉强度的影响[J].混凝土,2001(10):40-42,36.
作者姓名:姚武  李杰  周钟鸣
作者单位:1. 同济大学混凝土材料研究国家重点实验室,上海,200092
2. 同济大学土木工程学院,上海,200092
基金项目:教育部高等学校骨干教师基金资助项目
摘    要:本文研究了低掺量聚丙烯纤维(体积掺量为0.2%)对普通混凝土和高性能混凝土抗拉强度长期性能的影响。研究结果表明,尽管在标准龄期范围内,低弹模的聚烯纤维对混凝土强度有负面影响,但随着龄期的增长,聚丙烯纤维对混凝土有显著的补强效应,抑制了混凝土内部微裂纹的生成和发展,提高了混凝土的连续性和完整性,有利于混凝土材料后期抗拉强度的增长和混凝土结构的安全性和耐久性。

关 键 词:聚丙烯纤维  混凝土  抗拉强度  补强效应
文章编号:1002-3550(2001)10-0040-04

Influence of polypropylene fiber on the tensile strength of concrete
YAO Wu ,LI Jie ,ZHOU Zhong ming.Influence of polypropylene fiber on the tensile strength of concrete[J].Concrete,2001(10):40-42,36.
Authors:YAO Wu  LI Jie  ZHOU Zhong ming
Affiliation:YAO Wu 1,LI Jie 2,ZHOU Zhong ming 1
Abstract:Influence of low volume fraction (0 2%) of polypropylene (PP) fibers on the long term tensile properties of normal and high performance concretes was studied in this paper.Test results indicated that adding PP fibers with low elastic modulus in concrete led to reduction in strength during the standard age.However,beyond 28 days,there exist a notable supplement effect due to PP fibers restraining the formation and growth of microcracks in concrete,which improved the continuity and integrality of concrete.Thus,low volume fraction of PP fibers are beneficial in enhancing long term tensile strength of concrete materials and improving safety and durability of concrete structures.
Keywords:polypropylene fiber  concrete  tensile strength  supplement effect
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