| 摘要: |
| 采用矿渣复合胶凝材料为固化剂固化（滨海）盐渍土.通过抗压强度试验、水稳性试验、可溶性离子含量测定试验、SEM分析试验、EDS能谱分析试验和XRD分析试验，测试了矿渣复合胶凝材料固化盐渍土（固化土）的无侧限抗压强度、水稳性和可溶性离子含量，观察了固化土的微观形貌，分析了固化土水化产物的组成，探讨了矿渣复合胶凝材料固化剂对盐渍土的固化机理.结果表明：固化土28，90d无侧限抗压强度较大，水稳性较强，能满足一般工程地基固化处理的要求.由于盐渍土中可溶性Cl-和SO2-4参与了矿渣复合胶凝材料的水化反应，并生成了新的水化产物片状晶体和针棒状晶体（3CaO·Al2O3·(05CaCl2·05CaSO4）·12H2O），因此固化土可溶性Cl-和SO2-4含量较低，无侧限抗压强度较大，水稳性较强. |
| 关键词: 滨海盐渍土 固化土 无侧限抗压强度 水稳性 Kuzel盐 |
| DOI：103969/jissn1007 9629201501015 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（51174015）；国家重大基础研究发展计划（973计划）项目（2010CB226803，2010CB731501） |
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| Experimental Study on Slag Composite Cementitious Material for Solidifying Coastal Saline Soil |
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LIU Chengbin, JI Hongguang, LIU Juanhong, HE Wei, GAO Chao
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School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
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| Abstract: |
| The slag composite cementitious material was used to solidify the coastal saline soil. Through the unconfined compressive strength test, water stability test, soluble ions content test, SEM analysis, EDS energy analysis and XRD analysis, the unconfined compressive strength, water stability and soluble ions content of solidified soil were tested, the microstructure of solidified soil was observed, the hydration products of solidified soil was analyzed, the solidification mechanism of saline soil solidified by the slag composite cementitious material was clarified. The results show that the 28d and 90d unconfined compressive strength of solidified soil are relatively high, the water stability of solidified soil is relatively good, and can meet the requirements for the general engineering foundation solidification processing. The soluble Cl- and SO2-4 in saline soil take part in the hydration reaction of slag composite cementitious material, and the crystals of 3CaO·Al2O3·(05CaCl2·05CaSO4）·12H2O in the shape of lamella and needle are generated, thereby the soluble Cl- and SO2-4 content in the solidified soil are reduced, the unconfined compressive strength and water stability of solidified soil are improved. |
| Key words: coastal saline soil solidified soil unconfined compressive strength water stability Kuzel salt |
