复合纤维对严寒地区混凝土抗冻性能的影响研究  

Effect of Composite Fiber on Frost Resistance of Concrete in Cold Regions

作　　者：贾超[1] 齐鑫[1] JIA Chao;QI Xin(Heilongjiang University of Chinese Medicine,Haerbin 150040,China)

机构地区：[1]黑龙江中医药大学,哈尔滨150040

出　　处：《当代化工》2021年第5期1035-1038,共4页Contemporary Chemical Industry

基　　金：国家自然科学基金面上项目,深部冻融土-混凝土结构相互作用接触界面力学特性研究(项目编号:51874286)。

摘　　要：为了研究严寒地区混凝土的抗冻性能,制备了5种不同聚丙烯纤维和钢纤维掺加的混凝土试件,测试了混凝土试件的抗压强度、抗折强度、质量损失率和动弹性模量,分析了不同冻融循环次数影响混凝土力学强度的变化规律。结果表明:复掺聚丙烯纤维和钢纤维能够在单掺一种纤维的基础上再进一步提高混凝土的抗压强度以及抗折强度;复合纤维混凝土的抗压强度、抗折强度、质量以及动弹性模量损失随着冻融循环次数的增大而增大;相同冻融次数下,复掺聚丙烯纤维1.0 kg·m^(-3)和钢纤维40 kg·m^(-3)条件下混凝土的抗冻性能最佳。In order to study the concrete antifreeze performance in the cold region, five different concrete samples with different mixed polypropylene fiber and steel fiber were prepared. The compressive strength,flexural strength, mass loss and dynamic elastic modulus of the specimens were tested, and the change rule of the strength of concrete mechanics under the different freezing and thawing cycles was analyzed. The results showed that, mixing polypropylene fiber and steel fiber further improved the compressive strength and flexural strength of concrete on the basis of mixing single fiber;The losses of compressive strength, flexural strength, mass and dynamic elastic modulus of composite fiber concrete increased with the increase of the number of freeze-thaw cycles;The frost resistance of concrete was the best under the conditions of mixing 1.0 kg·m^(-3) polypropylene fiber and 40 kg·m^(-3) steel fiber under the same number of freeze-thaw times.

关 键 词：复合纤维 混凝土 冻融循环 抗冻性能 

分 类 号：TU528[建筑科学—建筑技术科学]