氯盐-硫酸盐内外源耦合作用下现浇玄武岩纤维混凝土耐腐蚀试验  

Corrosion resistance test of cast-in-place basalt fiber reinforced concrete under the coupling effect of internal and external chloride and sulfate

作　　者：宋明鸿 王成[1,2] 葛广华[1] 王流鑫 周俊尧 SONG Minghong;WANG Cheng;GE Guanghua;WANG Liuxin;ZHOU Junyao(School of Hydraulic and Architectural Engineering,Tarim University,Alar 843300,China;Southern Xinjiang Geotechnical Engineering Research Center,Tarim University,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]塔里木大学南疆岩土工程研究中心,新疆阿拉尔843300

出　　处：《混凝土》2024年第11期43-50,共8页Concrete

基　　金：新疆生产建设兵团重点领域科技攻关计划项目(2019AB016);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)。

摘　　要：将不同体积掺量(0、0.1%、0.3%、0.5%)的短切玄武岩纤维和拌和水质量3%的NaCl试剂掺入混凝土中,开展不同浓度(0、3%、5%、10%)Na2SO4溶液全浸泡下现浇玄武岩纤维混凝土的耐腐蚀试验,探究强盐渍土环境中现浇玄武岩纤维混凝土的抗盐蚀性能。研究结果表明:(1)内掺氯盐后,现浇混凝土中水泥早期的水化速率明显加快,但过快的水化使得混凝土后期强度增长速率放缓,导致试件的宏观耐久性能比基准组试件的差;(2)玄武岩纤维的桥接作用延缓了现浇混凝土内部微裂缝的生成和扩展进程,提升了试件抵抗氯盐-硫酸盐内外源耦合侵蚀的能力;(3)玄武岩纤维掺量为0.3%试件组的立方体抗压强度和抗折强度均比其他掺量试件组的高,其相对动弹性模量变化最为平缓,质量损失率最小,腐蚀产物最少,抵抗氯盐-硫酸盐内外源耦合侵蚀的能力最强。研究成果可为强盐渍土地区现浇玄武岩纤维混凝土的工程应用提供参考依据。To explore the salt erosion resistance of cast-in-place basalt fiber reinforced concrete in a strong saline soil environment,a series of corrosion resistance tests were conducted on cast-in-place basalt fiber reinforced concrete immersed in Na2SO4 solutions with various concentrations(0,3%,5%,10%).The experimental concrete was mixed with different volume percentages(0,0.1%,0.3%,0.5%)of short-cut basalt fiber and 3%NaCl solution.The research results indicate that:(1)adding chloride salts accelerates the early hydration rate of cement in cast-in-place concrete significantly,but the rapid hydration resulted in a slowdown in the growth rate of concrete strength in later period,so the macroscopic durability performance of the specimens are poorer compared to the benchmark group specimens;(2)The bridging effect of basalt fibers delays the generation and propagation of internal microcracks in cast-in-place concrete.The erosion resistance of specimen under the coupling effect of internal and external chloride and sulfate are enhanced;(3)The specimen with 0.3%basalt fiber content has the highest cubic compressive strength and flexural strength.This specimen exhibited the most smoothly change in relative dynamic modulus,the smallest mass loss rate,the least corrosion products,and the strongest resistance to the coupling effect of internal and external chloride and sulfate.The research results can provide reference basis for the engineering application of cast-in-place basalt fiber concrete in strongly saline soil areas.

关 键 词：玄武岩纤维 现浇混凝土 复合盐 长期浸泡 耐久性 

分 类 号：TU528.572[建筑科学—建筑技术科学]