| 项国圣,葛磊,谢胜华,周殷康,司海宝.钢渣和石灰改良膨胀土的工程特性研究[J].安徽建筑大学学报,2022,30(): |
| 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 |
| 投稿时间：2021-12-13 修订日期：2022-01-05 |
| DOI： |
| 中文关键词: 改良膨胀土 钢渣 石灰 工程特性 |
| 英文关键词: modified expansive soil steel slag limestone engineering properties |
| 基金项目:国家自然科学基金资助项目(41702311)；安徽省自然科学基金资助项目(1708085QE99,2108085QD168) |
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| 中文摘要: |
| 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。 |
| 英文摘要: |
| Steel slag and crushed limestone are added to natural expansive soil to improve its engineering properties. The limit of moisture content, compaction, swelling pressure and bearing ratio of the modified expansive soil were tested, and the influence of steel slag and lime on the engineering characteristics of modified expansive soil was studied. Results showed that the increase in the content of steel slag and lime decreased the limit of moisture content such as liquid limit and plastic limit, and decreased the optimal moisture content, but increased the maximum dry density. After adding steel slag and lime, the swelling properties of the improved soil decreased significantly, while the bearing ratio increased markedly. Under the same conditions, the improvement effect of steel slag on the engineering characteristics of expansive soil is better than that of lime, but the combination of the two materials is best. This is due to that in addition to ion exchange with expansion soil, produce flocculation, steel slag can also produce C-S-H gel materials, and the addition of lime can provocate the reaction of gel materials. |
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