摘要
将废弃混凝土、烧结砖进行资源化利用是解决城市建筑垃圾堆放及污染的重要途径。通过试验研究分析了不同纤维及纤维掺量对纳米再生混凝土力学性能的影响。研究表明:纳米再生混凝土的抗压强度随着聚乙烯醇(PVA)纤维或聚丙烯(PP)纤维的掺入而下降,且PP纤维对其抗压强度具有更大的削弱作用;抗折强度与劈裂抗拉强度随PVA纤维掺量的增加先增大后减小,掺量为0.9 kg/m^(3)时的增强效果最为显著;纤维掺量(1.2 kg/m^(3))相同的情况下,PVA纤维较之PP纤维具有更为优异的增强效果;对PVA纤维纳米再生混凝土的强度指标进行拟合分析,其劈裂抗拉强度、抗折强度均与抗压强度具有良好的幂函数相关性。
The resource utilization of waste concrete and sintered bricks is an important way to solve the piling and pollution of urban construction waste. The effects of different fibers and fiber content on the mechanical performance of nano recycled concrete were analyzed through experimental research.The results show that the compressive strength of nano recycled concrete decreases with the incorporation of polyvinyl alcohol(PVA)fiber or polypropylene(PP)fiber,and PP fiber has a stronger weakening effect on the compressive strength;with the increase of PVA fiber content,the flexural strength and split tensile strength first increase and then decrease. When the content of PVA fibers is 0.9 kg/m^(3),the flexural strength and splitting tensile strength of nano recycled concrete are significantly improved. When the fiber content(1.2 kg/m^(3))is the same,PVA fiber has a better reinforcing effect than PP fiber. Fitting analysis of the strength index of PVA fiber nano recycled concrete shows that the splitting tensile strength and flexural strength have a good power function correlation with the compressive strength.
作者
王娣
陈自豪
戚国峰
元成方
WANG Di;CHEN Zihao;QI Guofeng;YUAN Chengfang(School of Civil Engineering,Zhengzhou University,Zhengzhou 450001,China;Zhengzhou Gongtu Construction Engineering Testing Co.,Ltd.,Zhengzhou 450001,China)
出处
《结构工程师》
2022年第5期93-98,共6页
Structural Engineers
基金
河南省重点研发与推广专项(202102310255)。
关键词
纤维
纳米再生混凝土
抗压强度
抗折强度
劈裂抗拉强度
fiber
nano recycled concrete
compressive strength
flexural strength
splitting tensile strength
作者简介
王娣(1994-),女,硕士研究生,研究方向为高性能水泥基复合材料,再生混凝土研究。E-mail:wd18838991664@163.com;联系作者:元成方(1983-),男,高级工程师,硕士生导师,研究方向为高性能水泥基复合材料,再生混凝土研究。E-mail:chengfang1102@zzu.edu.cn。
