【摘要】 针对典型中膨胀土、CMA改性土和石灰改性土,进行了基本物理特性、击实特性、胀缩特性、强度特性的对比试验研究.试验结果表明,CMA改性土的工程特性与石灰改性土具有相似的规律性:改性后自由膨胀率、液限、塑性指数和胶粒含量显著降低;胀缩性指标较改性前有大幅度下降;CBR值可达50%以上,浸水膨胀量小于1%,改性后其水稳定性较好.比较而言,石灰改性土的改性效果要优于CMA改性土,但两种改性土的胀缩指标和强度指标均可以满足规范要求.CMA改性剂作为一种膨胀土治理的新型环保性材料,具有一定的工程应用价值.更多还原

【Abstract】 Comparative tests on physical characterization,compaction behavior,swelling-shrinkage characteristics and California bearing ratio of typical expansive soils,CMA-treated soils and Lime-treated soils were carried out.The test result indicates that the engineering property of CMA-treated soil possesses the similar regularity with the soil modified with lime.Compared with unmodified soils,the free swelling ratio,liquid limit,plastic index and clay fraction decrease obviously.The swelling-shrinkage property was significantly improved.The California bearing ratio reaches 50% and expansion ratio is small.Comparing two kinds of modified soil,the engineering property of the CMA-treated soil is superior to the modified soil of lime.The expansive index and strength index of two kinds of modified soil can satisfy the standard requirement.This study benefits the effective use of CMA and thus cost effective method for improving the expansive soil properties.更多还原