Effectiveness of Portland Cement and Lime in Stabilizing Clay Soils
Effectiveness of Portland Cement and Lime in Stabilizing Clay Soils
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DOI：
10.3141/1652-28
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发表时间：
1999
影响因子：
1.7
通讯作者：
J. Prusinski;S. Bhattacharja
中科院分区：
文献类型：
--
作者：
J. Prusinski;S. Bhattacharja
用粘性土建造的路面路基，由于水分引起的体积变化和路基支撑值较低，会造成严重的路面损坏。石灰以其稳定塑性粘土的能力而闻名；然而，波特兰水泥也提供了高效的粘土稳定，通常还具有更高的强度收益。使用水泥或石灰稳定粘土可以以较低的成本改善路基性能，而不是通过移除和更换材料或增加基层厚度来降低路基应力。综述了钙基稳定剂硅酸盐水泥和石灰稳定粘土的机理。这些材料通过阳离子交换、絮凝和凝聚以及火山灰反应来改变土壤性质。此外，水泥还提供水化产物，增加路基材料的强度和支撑值，并增强处理的持久性。对其他人关于用硅酸盐水泥或石灰稳定粘土的室内和现场性能的比较研究进行了批判性的综述。讨论了影响稳定剂稳定性的几个因素，包括稳定剂试验程序、剂量对土壤性质的影响、混合、压实以及级配和粉化。此外，还对水泥和石灰作为稳定剂的耐久性进行了综述，包括干湿、冻融、淋滤和长期现场性能。研究表明，如果水泥和石灰配合比和使用得当，可以有效地改善粘性土的工程性质，延长路面的使用寿命。给出的结果为工程师提供了关于使用波特兰水泥和石灰时在体积稳定性、强度和耐久性方面预期的性能变化的指导。
Pavement subgrades constructed with clay soils can cause significant pavement distress because of moisture-induced volume changes and low subgrade support values. Lime is well known for its ability to stabilize plastic clays; however, portland cement also provides highly effective clay stabilization, usually with the added benefit of higher strength gain. Stabilizing clays with cement or lime can improve subgrade properties at a lower cost than either removing and replacing material or increasing the base thickness to reduce subgrade stress. The clay soil stabilization mechanism for the calcium-based stabilizers portland cement and lime is reviewed. These materials modify soil properties through cation exchange, flocculation and agglomeration, and pozzolanic reaction. Additionally, cement provides hydration products, which increase the strength and support values of the subgrade materials as well as enhance the permanence of the treatment. Comparative laboratory and field performance studies by others, focusing on stabilization of clay soils with portland cement or lime, are critically reviewed. Several factors affecting stabilization are discussed, including stabilizer test procedures, dosage effects to soil properties, mixing, compaction, and gradation and pulverization. Additionally, durability of cement and lime as stabilizers is reviewed, including wetting and drying, freezing and thawing, leaching, and long-term field performance. The research reviewed indicates that, if proportioned and applied properly, both cement and lime can effectively improve the engineering properties of clay soils over the life of a pavement. The results presented provide a guide to the engineer about the property changes to expect when using portland cement and lime with regard to volume stability, strength, and durability.