水道港口2024，Vol.45Issue(1)：92-99,8.
PVA-ECC材料抗压强度及收缩性的时变规律研究
Study on time-varying law of compressive strength and contractibility rate of polyvinyl alcohol engineered cementitious composites(PVA-ECC)
摘要
Abstract
The long-term macro-mechanical performance of polyvinyl alcohol engineered cementitious composites(PVA-ECC)for port hydraulic structure reinforcement and repair was considered crucial.A study was conducted to investigate the time-varying behavior of PVA-ECC macro-mechanical properties by compressive strength and shrinkage tests on specimens of different ages.It is found that the flow ability of PVA-ECC with a 2%PVA content is poor,and its suitability for port hydraulic structural reinforcement required further research.Compressive strength tests reveal that the compressive strength of specimens with 1.5%and 1.8%PVA content exhibits a parabolic increase trend with their age increased.After 180 days of curing,the compressive strength of the specimens reaches 69.4 MPa and 76.1 MPa,respectively,which are 1.5 times and 1.6 times as much as the strength of C40 concrete specimens.Both of the strength values meet the requirements for the structural reinforcement.Shrinkage test shows that the shrinkage of all three types of specimens tends to stabilize after 28 days.The specimens with different PVA content have higher shrinkage compared to C40 concrete specimens,while the shrinkage of specimens with a 1.5%PVA contentis closer to that of C40 concrete specimens.Considering the better workability of PVA-ECC with a 1.5%PVA content,its compressive strength meeting the engineering requirements,and its shrinkage being closer to that of concrete,it is recommended to use a 1.5%PVA content in port engineering structural reinforcement projects.Meanwhile,equations were formulated,based on experimental data,to predict the cube strength of PVA-ECC material with different mix proportions and ages,which could be used for strength prediction of PVA-ECC material.关键词
PVA-ECC/宏观力学特性/时变规律/立方体抗压强度/收缩率Key words
PVA-ECC/macro-mechanical properties/time-varying law/cube compressive strength/contractibility rate分类
交通工程引用本文复制引用
刘红彪,戴江山,刘海成,齐方利,张路刚,薛德清..PVA-ECC材料抗压强度及收缩性的时变规律研究[J].水道港口,2024,45(1):92-99,8.基金项目
国家重点研发计划项目(2022YFB3207400) （2022YFB3207400）
中央级公益性科研院所基本科研业务费项目(TKS20230104) （TKS20230104）
