掺高炉水渣膨胀土的室内改良试验研究

Experimental study of expansive soil improved with granulated blast furnace slag(GBFS)

通过掺入10%～20%不同量的高炉水渣来改性膨胀土,对素土及其掺高炉水渣改性土的基本物理力学性质、胀缩特性进行试验对比研究,确定改性效果。试验结果表明,高炉水渣可以大幅降低膨胀土的自由膨胀率、液限和塑性指数,同时改善膨胀土的颗粒级配、强度特性。改性后的膨胀土黏粒减少,粉粒增多,干密度随含水率变化较小,水稳性提高。这说明了高炉水渣对膨胀土具有很好的改性效果。

Granulated blast furnace slag（GBFS） is utilized to overcome or to limit the expansion of an expansive soil sample.GBFS is added to sample in proportions of 10%-20% by weight.The test studies of swelling-shrinkage and basic physico-mechanical characteristics of soil samples are taken,so as to determine the improvement effects.Compared with unmodified sample,the free swelling ratio,liquid limit and plastic index decrease obviously;and the particle size gradation,strength characteristics and hydrated properties of the treated expansive soil are improved by a wide range.After improvement,clay content decreases,while silt content increases.The change of dry density with water content decreases and the hydrated property of modified soil is enhanced.It is shown that adding GBFS can successfully improve the expansive soil.