盐渍土地区水泥基浆液最优配比及早期耐腐蚀性研究

发布时间：2018-05-25 21:27

本文选题：建筑地基 + 注浆材料　；参考：《建筑科学》2017年05期

【摘要】：针对西北盐渍土地区建筑地基注浆加固工程,选用水泥基注浆材料,对所选材料之间固化反应机理的可行性进行了分析。采用正交试验研究了不同配比下浆液的各项物理力学性能,对选出的最优配比浆液的浆液稳定性、粘度时变性和凝胶时间进行了试验,并且对最优配比浆液结石体和纯水泥浆液结石体进行了腐蚀溶液浸泡和SEM微观对比试验。结果表明:水灰比1.0,其他掺量占水泥的质量百分比分别为粉煤灰40%、Ca(OH)28%、无水硫酸钠7%和膨润土3%,浆液性能最优;最优配比浆液的密度1.658g/cm~3、3h析水率3%、结石率97%、初配漏斗粘度37s、7d(28d)抗压强度为7.20MPa(12.23MPa),均满足水泥基稳定浆液的要求;最优浆液的最佳注浆时间为90min;最优浆液结石体比纯水泥浆液结石体更密实,早期耐腐蚀性能更优。
[Abstract]:In view of the grouting and strengthening project of building foundation in the saline soil area of northwest China, the feasibility of curing reaction mechanism between the selected materials was analyzed by selecting cement based grouting materials. The physical and mechanical properties of the slurry with different proportions were studied by orthogonal test. The stability, time-varying viscosity and gel time of the optimal mixture were tested. The corrosion solution immersion and SEM microcosmic contrast test were carried out on the optimal mixture of slurry stone and pure cement slurry stone. The results show that the ratio of water to cement is 1.0, the percentage of other content in cement is 40% fly ash and CaOH28%, anhydrous sodium sulfate 7% and bentonite 3%, and the slurry performance is the best. The optimum mixture density is 1.658g / cm ~ (-1) / cm ~ (-1) ~ (3) h water evolution rate is 3, stone rate is 97, and initial funnel viscosity is 7.20 MPA / cm ~ (3 ~ 3) d ~ (28 d). The compressive strength is 7.20 MPA / cm ~ (3) ~ (3) mg / h, which can meet the requirements of cement based stable slurry. The optimum grouting time is 90 min, the optimum slurry stone is more dense than the pure cement slurry stone, and the early corrosion resistance is better.
【作者单位】：兰州理工大学西部土木工程防灾减灾教育部工程研究中心;陕西建工机械施工集团有限公司;山西大学土木工程系;
【基金】：国家自然科学基金资助项目(51168031) 中国科学院盐湖资源与化学重点实验室开放基金资助(KLSLRC-KF-13-HX-8) 甘肃省建设科技攻关基金项目(JK2014-34)
【分类号】：TU528

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