纤维掺量对超高韧性混凝土受弯性能的影响  

An Experimental Study on the Influence of Modified PP Fiber Content on Flexural Properties of Ultra High Toughness Concrete

作　　者：文韬 姜久红 王云飞 WEN Tao;JIANG Jiuhong;WANG Yunfei(School of Civil Engineering,Architecture and Environment,Hubei Univ.of Tech.,Wuhan 430068,China)

机构地区：[1]湖北工业大学土木建筑与环境学院,湖北武汉430068

出　　处：《湖北工业大学学报》2021年第2期95-98,共4页Journal of Hubei University of Technology

摘　　要：通过3组不同掺量的改性PP(聚丙烯)纤维超高韧性混凝土的四点抗折实验,研究了不同掺量的改性PP纤维对超高韧性混凝土受弯性能的影响,研究表明:当纤维含量较低时没有足够的纤维支撑整体材料的拉应力,且改性PP纤维掺入量与混凝土抗折性能成正比;纤维掺量由1%、2%到3%,抗折强度明显增加,纤维掺量超过3%时抗折强度开始降低;较普通混凝土抗折强度提升了184%~254%。通过改性工艺提高PP纤维与胶凝材料的连结力,减少了裂纹的产生,大幅提高了混凝土的抗折强度。由于其较为廉价的制作成本和较高的力学响应,可大范围生产使用。Through the four-point bending test of three groups of ultra-high toughness concrete with different content of modified PP fiber,the influence of different content of modified PP fiber on the flexural performance of ultra-high toughness concrete is studied.The results show that when the fiber content is low,there is not enough fiber to support the tensile stress of the whole material,and the content of modified PP fiber is directly proportional to the flexural performance of concrete.The flexural strength of concrete increases from 1%,2%to 3%,and decreases when the fiber content exceeds 3%,which is 184%~254%higher than that of ordinary concrete.Through the modification process,the connection force between PP fiber and cementitious material is improved,the generation of cracks is reduced,and the flexural strength of concrete is greatly improved.Because of its low cost and high mechanical response,it can be widely used in production.

关 键 词：超高韧性混凝土 改性聚丙烯纤维 抗折强度 连结力 

分 类 号：TU528.572[建筑科学—建筑技术科学]