钢渣和石灰改良膨胀土的工程特性研究  

Study on Engineering Characteristics of Expansive Soil Modified by Steel Slag and Crushed Limestone

作　　者：项国圣[1,2] 葛磊 谢胜华 周殷康[1] 司海宝 XIANG Guosheng;GE Lei;XIE Shenghua;ZHOU Yinkang;SI Haibao(College of Civil Engineering and Architecture,Anhui University of Technology,Ma'anshan 243002,China;Department of Geotechnical Engineering,Tongji University,Shanghai 200030,China)

机构地区：[1]安徽工业大学建筑工程学院,安徽马鞍山243002 [2]同济大学地下建筑与工程系,上海200030

出　　处：《安徽建筑大学学报》2023年第1期30-34,共5页Journal of Anhui Jianzhu University

基　　金：国家自然科学基金项目(41702311);安徽省自然科学基金项目(1708085QE99、2108085QD168)。

摘　　要：在天然膨胀土中添加钢渣和石灰以改良工程性质。对改良后膨胀土进行界限含水率、压实性、膨胀性以及承载比试验,研究钢渣和石灰作为添加剂对膨胀土工程特性的影响。结果表明,随着钢渣/石灰掺量的增加,液限、塑限等界限含水率降低,最优含水率下降而最大干密度增加;掺钢渣和石灰后,改良土的膨胀性能显著降低,承载比明显增加。相同条件下,钢渣对膨胀土工程特性的改良作用优于石灰,而两者结合使用时效果更佳。这是由于钢渣除了与膨胀土发生离子交换,产生絮凝作用外,还可生产C-S-H等胶凝物质,加入石灰可以激发钢渣胶凝物质的反应。The consistency limit,compaction,swelling property and bearing ratio tests were conducted on the modified expansive soil to study the influence of steel slag and lime as additives on the engineering properties of the modified expansive soil. Results showed that with the increase of steel slag and lime,the consistency limit such as liquid limit and plastic limit decreased,and the optimum moisture content decreased,while the maximum dry density increased. The swelling property of the modified soil decreased significantly and the bearing ratio increased markedly when steel slag and lime were added. The improvement of steel slag on the engineering properties of expansive soil is better than that of lime under the same conditions,and the effect is even better when the two are used in combination,for the steel slag not only exchanges ions with the expansive soil to produce flocculation,but also produces gels such as C-S-H,which were provocated with lime.

关 键 词：改良膨胀土 钢渣 石灰 工程特性 

分 类 号：O319.56[理学—一般力学与力学基础]