玄武岩-PVA混杂纤维对混凝土耐久性能影响研究  

Study on the influence of basalt-PVA hybrid fiber on the durability of concrete

作　　者：王剑 WANG Jian(Gansu Construction Design Consulting Group Co.,Ltd.,Lanzhou 730000,China)

机构地区：[1]甘肃省建设设计咨询集团有限公司,甘肃兰州730000

出　　处：《混凝土》2024年第6期151-154,共4页Concrete

摘　　要：为了研究玄武岩纤维(BF)与聚乙烯醇纤维(PVA)复掺混杂纤维在混凝土体系中对混凝土耐久性能影响,通过耐久性试验研究做系统探究。结果表明:(1)玄武岩-PVA混杂纤维掺量0.2%时,干湿交替次数90次混凝土抗压强度耐腐蚀系数、质量损失率分别为75.5%、4.3%,抗硫酸盐等级为KS90。其他掺量抗硫酸盐等级均为KS60。表明玄武岩-PVA混杂纤维会提高混凝土抗硫酸盐侵蚀性能。(2)冻融循环200次,质量损失率最低降低值0.05%,最高降低值0.12%;相对动弹性模量最低提高值0.5%,最高提高值1.0%。表明玄武岩-PVA混杂纤维有助于提高混凝土抗冻性。(3)玄武岩-PVA混杂纤维掺量增加,混凝土试件电通量先减小后增大,在掺量0.2%时达到最低值1 700 C。表明适宜掺量提高混凝土抗氯离子渗透性能。In order to study the effect of basalt fiber(BF)and polyvinyl alcohol fiber(PVA)mixed fiber in the concrete system,it systematically explores the durability test research.The results show that(1) Basalt-PVA mixed fiber content is 0.2%,the corrosion resistance coefficient and mass loss rate of concrete with 90 times dry and wet alternating are 75.5% and 4.3% respectively,and the sulfate resistance grade is KS90.All other antisulfate grades were KS60.It shows that basalt-PVA mixed fiber will improve the sulfate erosion resistance of concrete.(2) During freeze and thaw cycle 200 times,the lowest mass loss rate is 0.05% and the highest decrease is 0.12%;the relative elastic modulus is 0.5% and the highest increase is 1.0%.It shows that basalt-PVA mixed fiber helps to improve the freezing resistance of concrete.(3) The dosage of basalt-PVA mixed fiber increases,the electrical flux of concrete specimen decreases and then increases,and the lowest value reaches 1 700 C when the admixture is 0.2%.It shows that the suitable content of concrete.

关 键 词：混杂纤维 体积掺量 混凝土 抗硫酸盐侵蚀 抗冻性 抗氯离子渗透 

分 类 号：TU528.041[建筑科学—建筑技术科学]