盐冻耦合作用下PVA纤维混凝土耐久性试验研究  

Durability of PVA fiber concrete under salt freezing coupling

作　　者：吕晨洁 武海荣 马先伟 张锋剑 LYU Chen-jie;WU Hai-rong;MA Xian-wei;ZHANG Feng-jian(College of Civil Engineering and Architecture,Henan University of Technology,Zhengzhou 450001,China;School of Civil and Transportation Engineering,Henan University of Urban Construction,Pingdingshan 467036,China)

机构地区：[1]河南工业大学土木建筑学院,河南郑州450001 [2]河南城建学院土木与交通工程学院,河南平顶山467036

出　　处：《河南城建学院学报》2025年第2期20-26,共7页Journal of Henan University of Urban Construction

基　　金：河南省自然科学基金(232300420107);河南省住房城乡建设科技计划项目(K-2320)。

摘　　要：为探究我国北部高寒高盐地区PVA纤维混凝土的耐久性,对不同PVA纤维体积掺量(0、0.1%、0.3%、0.5%)的混凝土试件在质量分数为5%的硫酸钠溶液中进行冻融循环试验,研究试件的表观形态、质量、超声波声速、抗压强度和劈裂抗拉强度随盐冻循环次数的变化情况,并分析不同体积掺量的PVA纤维对混凝土力学性能的提升效果。结果表明:掺入PVA纤维可以提高混凝土的抗盐冻性能,最优体积掺量为0.3%,该掺量下经盐冻循环150次后混凝土的质量损失率为0.23%,相对动弹性模量为0.962;随着盐冻循环次数的增加,混凝土抗压强度先升高后降低,劈裂抗拉强度降低,且降低速率逐渐增大;盐冻循环次数相同时,体积掺量为0.3%的PVA纤维对混凝土力学性能的提升效果最佳。To explore the durability of PVA fiber concrete in high cold and high salt area in northern China,freeze-thaw cycle test was carried out for concrete with different PVA fiber volume content(0,0.1%,0.3%and 0.5%)in sodium sulfate solution with a mass fraction of 5%.The apparent morphology,mass,ultrasonic velocity,compressive strength and splitting tensile strength of the specimen were studied with the times of salt freezing circulation,and the effect of PVA fiber with different volume content on the mechanical properties of concrete was analyzed.The results show that adding PVA fiber to concrete can improve the salt-freezing resistance of concrete,and the optimal volume content of PVA fiber is 0.3%,at which the mass loss rate of concrete is 0.23%and the relative dynamic elastic modulus is 0.962 at 150 times of salt-freezing.With the increase of the number of salt-freezing cycles,the compressive strength of concrete first increases and then decreases,while the splitting tensile strength decreases and the decreasing rate increases gradually.When the number of salt-freezing cycles is the same,the PVA fiber with 0.3%volume content has the best effect on improving the mechanical properties of concrete.

关 键 词：PVA纤维混凝土 硫酸盐侵蚀 冻融循环 耐久性 力学性能 

分 类 号：TU528[建筑科学—建筑技术科学]