碱激发矿渣固化重氯盐渍土强度与固化机理研究  

Study on Strength and Curing Mechanism of Heavy Chlorinated Saline Soil by Alkali Activated Slag

作　　者：屈磊[1] 沈君 宋心彤 赵志阳 邹东博 程寅[2] Qu Lei;Shen Jun;Song Xintong;Zhao Zhiyang;Zou Dongbo;Cheng Yin(Xinjiang Production and Construction Corps Highway Science and Technology Co.,Ltd.,Urumqi 830000,China;Engineering Technology and Materials Research Center,China Academy of Transportation Sciences,Beijing 100029,China;Zhejiang Geological and Mineral Construction Co.,Ltd.,Hangzhou 310052,China)

机构地区：[1]新疆生产建设兵团公路科学技术有限公司,新疆维吾尔自治区乌鲁木齐830000 [2]交通运输部科学研究院工程技术与材料研究中心,北京100029 [3]浙江省地矿建设有限公司,浙江杭州310052

出　　处：《市政技术》2025年第3期215-223,共9页Journal of Municipal Technology

基　　金：中央级公益性科研院所基本业务费项目(20247505)。

摘　　要：采用碱激发矿渣胶凝材料(矿渣)固化重氯盐渍土,以水泥(PC)固化重氯盐渍土为对照组,通过室内试验与现场测试,研究了不同养护方式对固化重氯盐渍土强度发展的影响。同时,通过分析固化重氯盐渍土的水化产物和微观形貌,揭示了矿渣固化重氯盐渍土的固化机理。研究结果表明:不同类型的固化重氯盐渍土在标准养护条件下的抗压强度均最高。与水泥固化重氯盐渍土相比,矿渣固化重氯盐渍土受养护方式影响较大,其在CM3养护方式下养护比在CM2养护方式下的180 d抗压强度损失降低了21.2%,其在低温养护下7、28 d抗压强度仅为同龄期标准养护试样的27.0%和44.7%。现场测试结果显示,矿渣固化重氯盐渍土在气温回升后抗压强度大幅度增长,其长期性能优于水泥固化重氯盐渍土。随着养护龄期的增加,矿渣固化重氯盐渍土中出现了更多的水滑石类化合物,且形成了比较致密的板块状结构,因此其抵御氯盐侵蚀能力更强,土中C-S-H也越稳定,长期性能更好。That alkali activated slag cementitious material(slag)is used to solidified heavy chloride saline soil are compared with that cement ones.The influence of different curing methods on the strength development of solidified heavy chloride saline soil is studied by indoor and field tests.Meanwhile,by analyzing the hydration products and microstructure,the curing mechanism of slag solidified heavy chloride saline soil was revealed.The research results indicate that different types of solidified heavy chloride saline soils have the highest compressive strength under standard curing conditions.Compared with cement solidified heavy chloride saline soil,slag solidified heavy chloride saline soil is more affected by the curing method.Its compressive strength loss at 180 days of curing method CM3 is reduced by 21.2%than curing method CM2.Its compressive strength at 7 and 28 days under low-temperature curing is only 27.0%and 44.7%of the standard curing samples of the same age.The on-site test results show that the compressive strength of slag solidified heavy chloride saline soil increases significantly after the temperature rises,and its long-term performance is better than that of cement solidified heavy chloride saline soil.With the increase of maintenance age,more water sliding stone compounds appeared in the slag solidified heavy chloride saline soil to form a relatively dense plate-like structure.Therefore,slag solidified heavy chloride saline soil has stronger ability to resist chloride salt erosion,and the C-S-H in the soil is more stable with better long-term performance.

关 键 词：重氯盐渍土 碱激发矿渣 养护方式 抗压强度 固化机理 

分 类 号：TU472.5[建筑科学—结构工程]