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以常州运河改线工程开挖出的淤泥质粉砂土用于路基填筑为目的,分析其物理和化学性质,通过掺入水泥、废旧混凝土和碱渣进行固化改性,研究改良土的路用性能。结果表明:在水泥和碱渣的掺量均为4%、废旧混凝土的掺量为20%的情况下,改良土的液限降低16.9%;塑性指数为12.5,与原状土相比降低了45.9%;无侧限抗压强度由原状土的无强度增大到302.7 kPa;CBR(%)值为111.4,提高了382%;膨胀量降低到0.075%,下降了85.2%;与原材料相比,改良土中重金属Cd,Zn,N i,Cu,Pb的浸出浓度降低12.7~51.3%,改性材料对Zn和Pb的固化稳定效果尤其明显
To Changzhou Canal Line Project excavation silt silt for the purpose of embankment filling, analysis of its physical and chemical properties, through the incorporation of cement, waste concrete and alkali residue for curing modification, the study of road improvement of soil performance. The results show that the liquid limit of modified soil is reduced by 16.9% when the content of cement and alkali residue are both 4% and the content of waste concrete is 20%; the plasticity index is 12.5, which is 45.9 lower than that of undisturbed soil %; The unconfined compressive strength increased from no strength of undisturbed soil to 302.7 kPa; the CBR (%) value was 111.4, increased by 382%; the expansion decreased to 0.075%, decreased by 85.2%; compared with the raw materials, The leaching concentration of heavy metals Cd, Zn, Ni, Cu and Pb in the soils decreased by 12.7-51.3%, and the effect of the modified materials on Zn and Pb solidification was especially obvious