基于RILEM TC 162TDF标准的聚丙烯纤维混凝土韧性研究  

Research on the toughness of polypropylene fiber concrete based on RILEM TC 162TDF standard

作　　者：董亚超 杨鼎宜[1,2] 葛晨 罗洪林 韩雪 单晨晨[1] DONG Yachao;YANG Dingyi;GE Chen;LUO Honglin;HAN Xue;SHANG Chenchen(College of Civil Science and Engineering,Yangzhou University,Yangzhou 225127,China;Institute of Green Building Materials,Yangzhou University,Yangzhou 225127,China)

机构地区：[1]扬州大学建筑科学与工程学院,江苏扬州225127 [2]扬州大学绿色建筑材料研究所,江苏扬州225127

出　　处：《混凝土》2019年第9期62-66,70,共6页Concrete

基　　金：国家自然科学基金(51578479);国家自然科学基金(51708483);国家重点研发计划(2016YFB0303104)

摘　　要：基于欧洲材料与结构联合会RILEM TC 162TDF抗弯试验法,通过聚丙烯粗细纤维单掺和混掺的切口梁试验得出P-δ曲线,以此来分析聚丙烯粗、细纤维在增强混凝土中不同阶段所起的作用。研究发现随着聚丙烯细纤维以0.3 kg/m^3递增梯度掺入混凝土中,混凝土的等效抗弯强度feq,2平均提升率为37.65%,等效抗弯强度feq,3平均提升率为19.97%;聚丙烯粗纤维以2 kg/m^3递增梯度掺入混凝土中时,混凝土的feq,2平均提升率为16.61%,feq,3平均提升率为48.48%,研究结果表明,聚丙烯粗、细纤维掺入混凝土中,细纤维起到前期阻裂的作用,而粗纤维起到后期增韧的作用,并且两种纤维混杂之后,对混凝土的增韧效果更为优异。Based on the RILEM TC 162TDF bending test method of the European Federation of Materials and Structures,the P-δcurve obtained from the notched beam test analyzes the role of polypropylene thick and thin fibers in reinforcing concrete at different stages.The study found that with polypropylene fine.The fiber was incorporated into the concrete in a gradient of 0.3 kg/m3.The average equivalent bending strength feq,2 of concrete was 37.65%,and the average equivalent bending strength feq,3 was 19.97%.Polypropylene coarse fiber was mixed into concrete with a gradient of 2 kg/m3.The average increase rate of feq,2 of concrete was 16.61%,and the average increase rate of feq,3 was 48.48%.The toughening effect on concrete is even better.The results of the study indicate that polypropylene fine and coarse fibers can be incorporated into concrete,which can play a role of early crack resistance and late toughening.

关 键 词：纤维混凝土 聚丙烯粗细纤维 弯曲韧性 切口梁 

分 类 号：TU528.572[建筑科学—建筑技术科学]