Enhanced flexural performance of epoxy polymer concrete with short natural fibers  

作　　者：HU Bin ZHANG NanLi LIAO YuTian PAN ZhiWei LIU YiPing ZHOU LiCheng LIU ZeJia JIANG ZhenYu 

机构地区：[1]School of Civil Engineering and Transportation, State Key Laboratory of Subtropical Building Science, South China University of Technology [2]The State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences

出　　处：《Science China(Technological Sciences)》2018年第8期1107-1113,共7页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 11772131 & 11772132);the Natural Science Foundation of Guangdong Province, China (Grant Nos. 2015A030311046 & 2015B010131009);the Opening Fund of State Key Laboratory of Nonlinear Mechanics (LNM), CAS;South China University of Technology (Grant No. 2017ZD096)

摘　　要：Epoxy polymer concrete(EPC) has found various applications in civil engineering. To enhance the flexural performance of EPC,two kinds of short natural fibers with high specific strength(sisal fibers and ramie fibers) have been incorporated into EPC. The results of mechanical tests show that a small loading of natural fibers(0.36 vol%) can significantly increase the flexural strength of EPC by 25.3%(ramie fibers) or 10.4%(sisal fibers). This enhancement is achieved without any sacrifice of compressive strength of EPC. The reinforcing effects of short natural fibers on the flexural properties and compressive properties of EPC decrease with further increase in fiber content, due to the insufficient wetting of fibers by epoxy resin which results in poor interfacial bonding. The reinforcing mechanisms of short natural fibers are explored according to the observation of fracture surfaces and micromechanical modelling. It is found that the parallel model based on the rule of mixture can be a good approximation to describe the improvement in flexural strength of the short natural fiber reinforced EPC at low fiber volume fractions.

关 键 词：epoxy polymer concrete （EPC） natural fibers fiexural strength micromechanics models 

分 类 号：TU528[建筑科学—建筑技术科学]