玄武岩纤维复掺改性混凝土耐硫酸盐侵蚀能力研究  

Study on sulphate erosion resistance of basalt fibre compound-modified concrete

作　　者：田鹏刚 王振山[3] 王锴 牛建辉 解智勋 刘康宁 施奕帆 TIAN Penggang;WANG Zhenshan;WANG Kai;NIU Jianhui;XIE Zhixun;LIU Kangning;SHI Yifan(Shaanxi Construction Engineering Holding Group Science and Technology lnnovation of Future City Co.,Ltd.,Xi′an 712000,China;SCEGC-XITU Joint Research Center for Future City Construction and Management Innovation,Xi′an 712000,China;School of Civil and Architectural Engineering,Xi′an University of Technology,Xi′an 710048,China;Shaanxi Academy of Building Science Co.,Ltd.,Xi′an 710082,China)

机构地区：[1]陕西建工控股集团未来城市创新科技有限公司,西安712000 [2]未来城市建设与管理创新联合研究中心,西安712000 [3]西安理工大学土木建筑工程学院,西安710048 [4]陕西省建筑科学研究院有限公司,西安710082

出　　处：《建筑结构》2025年第3期64-69,56,共7页Building Structure

基　　金：国家自然科学基金(51608441);未来城市建设与管理创新联合研究中心揭榜挂帅基金资助项目(2024WHZ0220)。

摘　　要：针对玄武岩纤维复掺改性混凝土耐硫酸盐侵蚀能力开展试验研究,共设计5种配合比试块,每90d进行吸水率、质量损失率、相对动弹性模量和抗压强度等测试,主要获得以下结论:经过270d侵蚀后,普通混凝土表层破损明显,改性混凝土表观形貌基本完整,普通混凝土强度降低25%,改性混凝土强度降低6%,其剩余强度为普通混凝土的1.77倍。同时,改性后混凝土吸水率降低20%,质量损失率减小90%,相对动弹性模量损失率减小52%。甲基硅酸钠与无机铝盐在混凝土内部形成复合防水层,玄武岩纤维阻断离子传输路径,通过复合改性方式可显著提升混凝土抗硫酸盐侵蚀能力。Experimental studies were carried out for the sulfate erosion resistance of basalt fiber compound-modified concrete.Specimens with 5 kinds of mixing ratios were designed,and the tests of water absorption rate,mass loss rate,relative dynamic elastic modulus and compressive strength were carried out every 90d.The following results were mainly obtained:after 270d erosion,the surface layer of ordinary concrete is obviously broken,and the apparent appearance of modified concrete is basically intact.The strength of ordinary concrete is reduced by 25%,while the strength of modified concrete is reduced by 6%,and its residual strength is 1.77 times of that of ordinary concrete.At the same time,the modified concrete water absorption is reduced by 20%,the mass loss rate is reduced by 90%,and the loss rate of dynamic elastic modulus is reduced by 52%.Sodium methyl silicate and inorganic aluminum salt form a composite waterproof layer inside the concrete,and basalt fibers block the ionic transmission path,which can significantly improve the sulfate erosion resistance of concrete through the composite modification method.

关 键 词：玄武岩纤维 硫酸盐 复合改性 耐久性 侵蚀机理 

分 类 号：TU528[建筑科学—建筑技术科学]