南疆盐渍土环境下聚乙烯醇纤维混凝土抗冻性能试验  

Freezing Resistance Experimental Study on Polyvinyl Alcohol Fiber Reinforced Concrete under Saline Soil Environment in Southern Xinjiang

作　　者：戎泽斌 王成[1,2] 李曦彤 李桢怡 薛山 RONG Ze-bin;WANG Cheng;LI Xi-tong;LI Zhen-yi;XUE Shan(College of Water Resources and Architectural Engineering,Tarim University,Alar 843300,China;South Xinjiang Geotechnical Engineering Research Center,Alar 843300,China)

机构地区：[1]塔里木大学水利与建筑工程学院,新疆阿拉尔843300 [2]南疆岩土工程研究中心,新疆阿拉尔843300

出　　处：《塑料科技》2022年第6期48-53,共6页Plastics Science and Technology

基　　金：国家自然科学基金(52168035);新疆生产建设兵团区域创新引导计划项目(2018BB045);新疆生产建设兵团重点领域科技攻关计划项目(2019AB016)。

摘　　要：为探究南疆地区盐渍土环境下,聚乙烯醇(PVA)纤维混凝土的抗盐冻性能,将不同体积掺量的PVA纤维掺入混凝土(C30)中,在不同浓度复合盐溶液(NaCl+Na_(2)SO_(4))侵蚀与冻融循环耦合作用下,对PVA纤维混凝土进行腐蚀劣化实验。结果表明:PVA纤维的掺入抑制试件内部微裂缝的扩展速度,延缓自由水的结冰速率,提高混凝土的抗盐冻性能。随着复合盐溶液浓度的增大,PVA纤维体积掺量与混凝土的抗盐冻性能呈正相关。PVA纤维掺量为0.3%时,试件的耐久性能最好。PVA纤维的掺入延缓混凝土内部腐蚀产物的生成速率,提高混凝土的抗开裂能力。研究成果可为PVA纤维混凝土在南疆地区实际工程中的应用提供参考。In order to explore the salt-freeze resistance of polyvinyl alcohol(PVA) fiber reinforced concrete in saline soil environment of southern Xinjiang, PVA fibers with different volume contents were mixed into concrete(C30). Under the coupling effect of corrosion and freeze-thaw cycles of composite salt solution with different concentrations(NaCl+Na_(2)SO_(4)), the corrosion degradation experiment of PVA fiber reinforced concrete was carried out. The results show that the incorporation of PVA fiber inhibits the expansion rate of microcrack in the specimen, delays the freezing rate of free water,and improves the salt-freezing resistance of concrete. With the increasing of composite salt solution concentration, the volume content of PVA fiber is positively correlated with the salt-freezing resistance of concrete. When the PVA fiber content is 0.3%, the durability of the specimen is the best. The incorporation of PVA fiber delays the formation rate of corrosion products in concrete and improves the cracking resistance of concrete. The research results can provide reference for the application of PVA fiber concrete in practical engineering in southern Xinjiang.

关 键 词：盐渍土 PVA纤维混凝土 冻融循环 腐蚀劣化 

分 类 号：TU528.572[建筑科学—建筑技术科学]