长沙理工大学学报（自然科学版）2024，Vol.21Issue(4)：103-114,12.DOI:10.19951/j.cnki.1672-9331.20220330002
膨润土-PVA纤维混凝土抗压强度及抗氯离子渗透性研究
Research on compressive strength and chloride ion penetration resistance of bentonite-PVA fiber concrete
摘要
Abstract
[Purposes]In view of the increasingly prominent problems of steel corrosion and cracking in concrete under harsh environments and complex loads,the effect of mixing bentonite and polyvinyl alcohol(PVA)fiber on the compressive strength and chloride ion penetration resistance of concrete was investigated,so as to improve the durability of concrete under harsh conditions.[Methods]Compressive strength test and chloride ion penetration resistance test were carried out on 16 groups of bentonite-PVA fiber concrete with different mix proportions.The effects of curing age,bentonite substitution rate,and PVA fiber content on the compressive strength and chloride ion penetration resistance of concrete were analyzed.At the same time,the microstructure characteristics of concrete with different amounts of bentonite and PVA fiber were observed by the scanning electron microscope(SEM)technology.[Findings]Moderate amounts of bentonite and PVA fiber can improve the compressive strength and chloride ion penetration resistance of concrete.The optimal bentonite substitution rate is 5.0％,and the optimal volume fraction of PVA fiber is 1.2 kg/m3.[Conclusions]The adhesion of bentonite particles on the surface of PVA fiber increases the roughness of the fiber and enhances the bonding between the fiber and the concrete,which makes the internal structure of concrete more compact,thus significantly improving the mechanical properties of concrete.This study can provide a reference for concrete modification in actual engineering.关键词
膨润土/聚乙烯醇纤维/抗压强度/抗氯离子渗透/扫描电子显微镜(SEM)Key words
bentonite/polyvinyl alcohol fiber/compressive strength/chloride ion penetration resistance/scanning electron microscope(SEM)分类
交通工程引用本文复制引用
马亚飞,杨莹,彭安银,李晶..膨润土-PVA纤维混凝土抗压强度及抗氯离子渗透性研究[J].长沙理工大学学报（自然科学版）,2024,21(4):103-114,12.基金项目
国家重点研发计划项目(2021YFB2600900) （2021YFB2600900）
湖南省杰出青年科学基金项目(2024JJ2003) Project(2021YFB2600900)supported by the National Key Research and Development Program of China （2024JJ2003）
Project(2024JJ2003)supported by National Science Foundation for Distinguished Young Scholars of Hunan Province （2024JJ2003）
