聚乙烯醇纤维对混凝土抗冻性能的影响  

The Effecting of Polyvinyl Alcohol(PVA) Fiber on Frost Resistance of Concrete

作　　者：安嘉伟 赵建军 刘曙光[1,2] 闫长旺 白茹[1] 徐勇彪 AN Jia-wei;ZHAO Jian-jun;LIU Shu-guang;YAN Chang-wang;BAI Ru;XU Yong-biao

机构地区：[1]内蒙古工业大学土木工程学院,呼和浩特010051 [2]内蒙古工业大学矿业学院,呼和浩特010051 [3]内蒙古双欣环保材料股份有限公司,鄂尔多斯016062

出　　处：《混凝土与水泥制品》2019年第7期51-54,共4页China Concrete and Cement Products

基　　金：国家自然科学基金项目(51368041、51768051)

摘　　要：为了研究聚乙烯醇(PVA)纤维混凝土的抗冻性能,共设计制作了21个标准混凝土抗冻试件。其中在18个普通混凝土试件里掺入了不同长度及不同体积掺量的PVA纤维,进行冻融循环试验。试验结果表明,随着冻融次数的增加,普通混凝土及PVA纤维混凝土的相对动弹性模量总体上呈现下降趋势,但普通混凝土下降趋势更明显。当冻融次数为75次时,普通混凝土相对动弹性模量已经下降至55.2%,而纤维混凝土在冻融次数为150次时,相对动弹性模量才下降20%之内。In order to study the frost resistance of polyvinyl alcohol (PVA) fiber concrete,21 standard concrete antifreeze specimens were designed and manufactured.Among them,PVA fibers of different lengths and different volumes were blended into 18 ordinary concrete specimens and freeze-thaw cycle tests were conducted.The experimental results show that with the increase of freeze-thaw cycles,the relative dynamic elastic modulus of ordinary concrete and PVA fiber concrete generally shows a downward trend,but the decline trend of ordinary concrete is more obvious.When the number of freezing and thawing is 75,the relative dynamic elastic modulus of ordinary concrete has dropped to 55.2%,and when the number of freeze-thaw cycles is 150,the relative dynamic elastic modulus of fiber concrete decreases within 20%.Therefore,fibers can effectively improve the frost resistance of concrete.

关 键 词：PVA纤维混凝土 抗冻性能 纤维长度 纤维体积掺量 寿命预测 

分 类 号：TU528.58[建筑科学—建筑技术科学]