Ca(OH)2改善弱酸性软土水泥土性能的试验与实践

Experimental studies on improving the properties of weak-acid soft cement-soil with Ca(OH)2

为了改善弱酸性软土水泥土工程性能,对比不同Ca(OH)2外加剂掺量下的水泥土配方试验,分析其对水泥土密度、无侧限抗压强度、渗透性、压缩性提高的效果。掺入Ca(OH)2后,其密度增大幅度基本位于4.8%以内。水泥土试件的抗压强度随着Ca(OH)2掺量的增加而增加,当掺量高于10%时增幅相对较小。随着养护龄期的增加,水泥土强度逐渐提高,特别是早期强度提高较为明显。随着外加剂掺量的增加,各个不同龄期的水泥土渗透系数随之降低,水泥土压缩模量得到提高。综合提高效果和经济性因素,Ca(OH)2外加剂掺量不宜超过10%。

In order to improve the engineering performance of weak-acid soft cement-soil,tests of cement-soil formula with different Ca(OH)2 admixture content were compared.The effects of the content on cement soil density,unconfined compressive strength,permeability and compressibility were analyzed.After the incorporation of Ca(OH)2,its density increase is basically within 4.8%.The compressive strength of the cement-soil test piece increases with the addition of the admixture Ca(OH)2.When the content is higher than 10%,the increase is relatively small;with the increase of the curing age,the strength of cement-soil is gradually increased,especially in the early stage;with the increase of the admixture content,the permeability coefficient of the cement-soil at different ages is reduced,and the compressive modulus of the cement-soil is improved.Taking into account effect improvement and economic factors,the content of Ca(OH)2 admixture should not exceed 10%.