纤维长度对聚乙烯纤维增强水泥基复合材料强度和韧性的影响  

Influence of fiber length on the strength and toughness of polytene fiber reinforced cementitious composite

作　　者：嵇绍华[1] 李永鹏[2] 何锐[2] 陈拴发[2] 

机构地区：[1]长安大学公路学院,陕西西安710064 [2]长安大学交通铺面材料教育部工程研究中心,陕西西安710064

出　　处：《混凝土》2014年第1期46-48,共3页Concrete

基　　金："十二五"国家科技支撑计划项目(2011BAE27B04)

摘　　要：为分析纤维长度对纤维增强水泥基复合材料性能的影响,采用3种不同长度的聚乙烯纤维制备纤维增强水泥基复合材料,根据抗压和抗折性能测试结果,并结合微观力学理论分析纤维长度的影响机理。结果表明,纤维长度对抗压强度影响较小,对抗折强度和韧性影响较大;随着纤维长度的增大,纤维桥联作用余能增大,复合材料更容易发生多缝开裂现象,所以导致变形能力和韧性的增大;但是由于受到纤维分散性能的影响,当纤维长度增大到18mm时,纤维桥联作用得不到有效发挥,抗折强度和韧性反而有所下降。Polyethylene fibers with three different lengths were adopted to prepare fiber reinforced cementitious composites and analyze the infuence of fiber length on the strength and toughness of polytene fiber reinforced cementitious composite.The impact mechanism of fiber length was proposed according to the results of compressive and flexural tests and the micro-mechanics theory.The results showed that the influ- ence of fiber length on the compressive strength was smaller than the fexural strength and toughness.With the increase of fiber length,the com- plementary energy of fiber bridging grew,leading to the multiple cracking of the composites and the growth of deformation capacity and tough- ness.However,when the length came to 18 ram,the fibers could not be dispersed uniformly, causing the decrease of flexural and toughness.

关 键 词：水泥基复合材料 纤维 抗折强度 微观力学 

分 类 号：TU528.041[建筑科学—建筑技术科学]