生活垃圾焚烧炉渣集料基本性质及其对水泥稳定碎石性能影响的研究

Study on Basic Properties of Slag Aggregate of Domestic Garbage Incinerator and Its Influence on Cement Stabilized Macadam Performance

生活垃圾焚烧炉渣集料(炉渣集料)具有连续的级配分布、一定的强度性能和潜在的水硬性能,可替代天然集料应用在水泥稳定碎石中。但炉渣集料基本性能对水泥稳定碎石的强度性能的影响尚不明晰。首先,对不同产地炉渣集料的基本性能进行研究;其次,以炉渣集料替代一定比例、同粒径的天然集料,进行水泥稳定炉渣碎石的配合比设计,基于无侧限抗压强度试验确定不同掺量炉渣集料的水泥稳定炉渣碎石的强度性能;最后,基于相关性分析,确定炉渣集料基本性能对水泥稳定炉渣碎石击实特性和强度性能的影响。试验结果表明:水泥稳定炉渣碎石的最佳含水率随炉渣集料掺量增加而增大、最大干密度随炉渣集料掺量增加而减小;随着炉渣集料掺量增加,水泥稳定炉渣碎石的强度逐渐降低,且水泥稳定干法炉渣碎石的强度高于水泥稳定湿法炉渣碎石强度。水泥稳定炉渣碎石的最佳含水率与炉渣集料的吸水率相关性较高;水泥稳定炉渣碎石的无侧限抗压强度与炉渣集料的密度、吸水率和烧失量呈正相关、与炉渣集料的压碎值呈负相关。

The slag aggregate of domestic garbage incinerator has the continuous gradation distribution,a certain strength performance and potential hydraulic performance,which can be used as a substitute for natural aggregate in cement stabilized macadam.However,the influence of basic properties of slag aggregate on the strength of cement stabilized macadam is not clear.Firstly,the basic properties of slag aggregates from the different producing areas places are studied.Then,the slag aggregate is used to replace the natural aggregate with a certain proportion and the same particle size in order to carry out the mix design of cement stabilized slag macadam.Based on the unconfined compressive strength test,the strength performances of cement stabilized slag macadam with the different admixtures of slag aggregate are determined.Finally,based on the correlation analysis,the influence of basic properties of slag aggregate on the compaction characteristics and strength properties of cement stabilized slag macadam is determined.The test results show that the optimum moisture content of cement stabilized slag macadam increases with the increase of slag aggregate content,and the maximum dry density decreases with the increase of slag aggregate content.With the increase of slag aggregate content,the strength of cement stabilized slag macadam gradually decreases,and the strength of cement stabilized slag macadam by drying method is stronger than that of cement stabilized slag macadam by wet method.The optimum moisture content of cement stabilized slag macadam has a high correlation with the water absorption of slag aggregate.The unconfined compressive strength of cement stabilized slag macadam is positively correlated with the density,water absorption and ignition loss of slag aggregate,and negatively correlated with the crushing value of slag aggregate.