- 目录
- 混凝土与制品
- 首页
聚丙烯纤维再生混凝土动态抗压性能及微观结构研究
作者：赵有正，韦芳芳，朱俞，杨晶晶
（河海大学 土木与交通学院，江苏 南京 210098）
摘要：聚丙烯纤维再生混凝土为废弃混凝土的再利用提供了一种解决方法。针对不同掺量聚丙烯纤维再生混凝土，用电液压力试验机测试其静态抗压性能，并用74 mm直径的分离式霍普金森压杆（SHPB）测试其动态冲击性能。此外，通过扫描电子显微镜（SEM）从微观结构上分析了聚丙烯纤维对再生混凝土的增强机理。结果表明，聚丙烯纤维可优化混凝土内部微观孔隙结构，从而提高再生混凝土的力学性能；且其动态抗压强度和冲击韧性在较高应变率下有显著提高；再生混凝土中聚丙烯纤维的最佳掺量为0.1%~0.2%。
关键词：再生混凝土；聚丙烯纤维；动态性能；SHPB试验；微观结构
中图分类号：TU528.572 文献标识码：A 文章编号：1001-702X（2023）01-0012-07
Experimental study on dynamic compressive performance and micro-structure of polypropylene fiber recycled concrete
ZHAO Youzheng，WEI Fangfang，ZHU Yu，YANG Jingjing
（College of Civil and Transportation Engineering，Hohai University，Nanjing 210098，China）
Abstract：Recycled concrete reinforced by polypropylene fiber provides a solution for the reuse of waste concrete. In this paper，the static compressive properties of variable content polypropylene fiber recycled concrete are tested by electro-hydraulic pressure tester，and the dynamic impact properties are tested by 74 mm diameter split Hopkinson compression bar（SHPB）. In addition，the strengthening mechanism of polypropylene fiber on recycled concrete was analyzed by scanning electron microscope（SEM）. The results show that polypropylene fiber can optimize the internal micro pore structure of concrete，so as to effectively improve the mechanical properties of recycled concrete. And its dynamic compressive strength and impact toughness are significantly improved at higher strain rates，and it can be further concluded that the optimal content of polypropylene fiber in recycled concrete is 0.1%~0.2%.
Key words：recycled concrete，polypropylene fiber，dynamic performance，SHPB test，micro-structure