生活垃圾焚烧炉渣集料处治土性能与处治机理

Property and Treatment Mechanism of Municipal Solid Waste Incineration Bottom Ash Aggregate Treated Soil

为研究生活垃圾焚烧炉渣集料(BAA)对土的处治效果和机理,采用X射线衍射仪(XRD)分析了BAA的化学组成和矿物组成,测定了BAA处治淤泥质土和粉质黏土的承载比(CBR)、无侧限抗压强度和回弹模量,分析了BAA掺量、BAA养生龄期、饱水和干湿循环条件等因素对处治土强度和变形特性的影响,探究了BAA对土的处治机理.结果表明:随着BAA掺量的增加,养生龄期的延长,2种处治土的CBR值、回弹模量和水稳定性均呈增大趋势;BAA对粉质黏土性能的提升效果优于对淤泥质土性能的提升效果;BAA的摩阻效应及其提供的水硬特性和火山灰反应是处治土性能提升的主要原因.综合考虑,推荐采用高活性BAA对土进行处治,并适当提高BAA掺量,延长养生龄期.

The treatment effect and mechanism of municipal solid waste incineration bottom ash aggregate(BAA)on soils were investigated.The strength and deformation of BAA treated silty clay,BAA treated mucky soil were conducted by CBR test,unconfined compressive strength test,and resilient modulus test,respectively.The influence of BAA proportions,curing period,water saturated treatment,drying-wetting cycle treatment on the strength and deformation property of BAA treated soils were investigated.Then,the chemical composition and mineral composition of BAA were investigated by XRD test,therefore the treatment mechanism of BAA treated soils were analyzed subsequently.Results show that CBR value,resilient modulus and water stability of two treated soils increase with the increase of BAA proportion and curing period.The property improvement effect of BAA on silty clay is better than mucky soil.The friction effect,hydraulicity,and pozzolanic reaction of BAA are the main reasons for the property improvement of soils.Considering test results comprehensively,it is recommended to treat soils with highly active BAA,and BAA proportion and curing period should be increased appropriately.