碱式硫酸镁水泥混凝土在硫酸盐溶液中的损伤过程研究

发布时间：2018-04-10 05:10

本文选题：碱式硫酸镁水泥混凝土　切入点：干湿循环　出处：《硅酸盐通报》2017年07期

【摘要】：采用干湿循环的试验方法研究碱式硫酸镁水泥(BMSC)混凝土抗硫酸盐腐蚀性能。以质量变化和相对动弹模量作为评价指标,研究了不掺加矿物掺合料(BMSC)、掺加30%粉煤灰(BMSC-F)碱式硫酸镁水泥和普通硅酸盐水泥(POC)混凝土抗硫酸盐腐蚀性能。结果表明:干湿循环前期,混凝土的质量缓慢增加;后期,混凝土的质量损失比较明显。在干湿循环的环境下,BMSC混凝土的E_(rd)变化包括以下4阶段:上升段,缓慢下降段,线性上升段,加速下降段;POC混凝土的E_(rd)随着干湿循环次数的增加,呈现先升高后下降的趋势。同等条件下,BMSC混凝土的抗硫酸盐腐蚀性能优于POC混凝土;掺加粉煤灰有利于提高BMSC混凝土的抗硫酸盐腐蚀能力。
[Abstract]:The sulphate corrosion resistance of basic magnesium sulfate cement (BMSC) concrete was studied by dry and wet cycle test.Taking the quality change and relative dynamic modulus as evaluation indexes, the sulphate corrosion resistance of basic magnesium sulfate cement and ordinary Portland cement (POC) concrete without mineral admixture (BMSC-F30% fly ash) was studied.The results show that the quality of concrete increases slowly in the early stage of dry and wet cycle, and the mass loss of concrete is obvious in the latter stage.In the dry and wet cycle environment, the changes of ESD of BMSC concrete include the following four stages: rising stage, slow descending stage, linear rising stage, accelerating descending stage and accelerating descending stage. With the increase of dry-wet cycle times, the ESP rdof concrete increases first and then decreases.Under the same conditions, the sulfate corrosion resistance of BMSC concrete is better than that of POC concrete, and the addition of fly ash can improve the sulphate corrosion resistance of BMSC concrete.
【作者单位】：青海大学土木工程学院;中国科学院青海盐湖研究所;
【基金】：国家自然科学基金(U1407104,21401209,51662035) 教育部春晖计划项目(Z2015041) 青海省自然科学基金项目(2015-ZJ-937Q,2015-ZJ-722,2015-ZJ-947Q) 青海省高等学校地基与基础教研创新团队项目
【分类号】：TU528

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