高性能修复剂对混凝土抗渗性和抗盐冻性能影响的研究

发布时间：2018-06-24 07:15

本文选题：混凝土 + 融循环　；参考：《结构工程师》2017年01期

【摘要】：以氯化胆碱为促进剂,超细二氧化硅为活化剂,沸石粉为反应助剂,52.5~#普通硅酸盐水泥为粘结剂,石英砂为结构增强剂,搅拌混匀后,将其与水按照0.4∶1比例,配置成混凝土用修复剂涂覆于混凝土试件表面,标准养护后便得到自修复混凝土试件。考察了自修复混凝土在标准养护条件下抗渗性能,采用混凝土快速冻融试验机和动弹仪对试件分别在Na_2SO_4、MgSO_4、NaCl溶液侵蚀下抗盐冻性能进行了考察。结果表明:自修复混凝土抗渗性、抗盐冻性能得到了明显的改善,一次抗渗压力(28 d)、二次抗渗压力(28 d)均明显高于基准混凝土抗渗压力,在NaCl溶液中,经冻融循环200次后,自修复混凝土质量损失率较基准混凝土减少了45%,其相对动弹模量较基准混凝土下降趋势更缓。
[Abstract]:Using choline chloride as accelerator, ultrafine silica as activator, boiling stone powder as reaction assistant, ordinary Portland cement as binder, quartz sand as structural reinforcement, and mixing it with water in the ratio of 0.4: 1, The surface of concrete specimen is coated with concrete repair agent, and the self-repairing concrete specimen is obtained after standard curing. The impermeability of self-repairing concrete under standard curing conditions was investigated. The salt freezing resistance of the specimens under Na2SO4MgSO4 NaCl solution erosion was investigated by using a rapid freeze-thaw test machine and a dynamometer. The results show that the impermeability and salt freezing resistance of self-repairing concrete are obviously improved, and the primary impermeability pressure (28 d), secondary impermeability pressure (28 d) is obviously higher than that of the reference concrete. The mass loss rate of self-repairing concrete is reduced by 45% than that of standard concrete, and its relative dynamic modulus is slower than that of benchmark concrete.
【作者单位】：内蒙古建筑职业技术学院装饰与艺术设计学院;内蒙古农业大学水利与土木建筑工程学院;
【分类号】：TU528

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