氯盐侵蚀钢渣水泥固化淤泥土力学特性及氯离子运移规律研究  

Study on Mechanical Properties of Steel Slag Cement Solidified Silt Soil and Law of Chloride Ion Transport under Different Erosion Times

作　　者：陈刚 马艳慧 郭肖阳 吴燕开 CHEN Gang;MA Yan-hui;GUO Xiao-yang;WU Yan-kai(The Fourth Engineering Co.,Ltd.of CCCC First Harbor Engineering Co.,Ltd.,Nanchang Jiangxi 330103,China;School of Civil Engineering and Architecture,Shandong University of Science and Technology,Qingdao Shandong 266590,China)

机构地区：[1]中交一航局第四工程有限公司,江西南昌330103 [2]山东科技大学土木工程与建筑学院,山东青岛266590

出　　处：《公路交通科技》2023年第1期48-58,共11页Journal of Highway and Transportation Research and Development

基　　金：山东省自然科学基金项目(ZR2022MD061)。

摘　　要：为研究氯盐侵蚀对钢渣水泥固化淤泥土力学特性的影响及氯离子运移规律,对氯盐侵蚀下钢渣水泥固化淤泥土的物理力学性质和微观结构展开室内试验。通过无侧限抗压强度试验、氯离子浓度测定试验、扫描电镜SEM试验深入研究了氯盐侵蚀钢渣水泥固化淤泥土在不同条件下的宏观物理力学特性、微观结构的变化及内部氯离子的迁移规律。结果表明:随着侵蚀时间的增加,钢渣水泥土试样的质量变化率明显高于水泥土,其最大质量变化率是水泥土最大质量变化率的1.78倍,含水量数值相差最大的可达9.17%和8.54%;随着侵蚀时间的增加,养护7 d试样的无侧限抗压强度整体呈增长趋势,养护28 d试样的无侧限抗压强度折线呈现出先增加后降低的形态,水泥土试样的无侧限抗压强度明显高于钢渣水泥土,其最大强度是钢渣水泥土最大强度的2.34倍;随着侵蚀时间的增加,内部氯离子浓度先增加后趋于稳定,水泥土试样较钢渣水泥土试样抗氯离子侵蚀能力较好,钢渣水泥土试样的最大氯离子浓度高于水泥土1.52倍。微观上,随着氯盐侵蚀时增加,水泥土试样内部结构排列变得相对疏松,严重破坏试样内部结构,降低其承载能力。In order to study the influence of chloride erosion on the mechanical properties of steel slag cement solidified silty soil and the rule of chloride ion migration, the indoor test on the physical and mechanical properties and microstructure of the steel slag cement solidified silty soil under chloride erosion is carried out. The macroscopic physical and mechanical properties, microstructure changes and internal chloride ion migration of the solidified chloride eroded steel slag cement solidified silty soil under different conditions are studied by using unconfined compressive strength test, chloride ion concentration measurement test and SEM test. The result shows that(1) With the increase of erosion time, the mass change rate of the steel slag cement soil specimen is significantly higher than that of cement soil, the maximum mass change rate is 1.78 times of that of cement soil, and the maximum difference of water content can reach 9.17% and 8.54%.(2) With the increase of erosion time, the unconfined compressive strength of the specimen cured for 7 days shows an overall growth trend, and the broken line of unconfined compressive strength of the specimen cured for 28 days shows the form of first increasing and then decreasing. The unconfined compressive strength of cement soil specimen is significantly higher than that of steel slag cement soil, and its maximum strength is 2.34 times that of steel slag cement soil.(3) With the increase of erosion time, the internal chloride ion concentration first increases and then tends to be stable. The chloride ion corrosion resistance of cement soil specimen is better than that of steel slag cement soil specimen, the maximum chloride ion concentration of steel slag cement soil specimen is 1.52 times higher than that of cement soil. Microscopically, with the increase of chloride erosion time, the internal structure arrangement of cement soil specimen becomes relatively loose, which can seriously damage the internal structure of the specimen and reduce its bearing capacity.

关 键 词：道路工程 氯离子运移规律 无侧限抗压强度 淤泥土 氯盐侵蚀 

分 类 号：TU442[建筑科学—岩土工程]