Research on using municipal solid waste incineration bottom ash for cement-stabilized macadam

Abstract

Municipal solid waste incineration bottom ash (MSWIBA) is the waste generated by incineration power plants. Because of its low activity, it is an effective way to apply it to cement-stabilized macadam (CSM) in road construction. CSM was prepared using varying proportions of bottom ash (0%, 15%, 20%, 25%, 30%, and 35%) and different proportions of cement (3.5%, 4%, 4.5%, 5%, and 5.5%), respectively, to explore the effects of MSWIBA as fine aggregates on the characteristics of cement-stabilized MSWIBA macadam (CSBAM). MSWIBA was examined in terms of its microstructure, chemical makeup, and physical characteristics. Heavy metal leaching, water stability, splitting strength, unconfined compressive strength, and dry shrinkage were all investigated for CSBAM. The findings demonstrated that there was some cementitious and volcanic ash activity and that the bottom ash had a rough, porous surface. The strength of CSBAM decreased with the increase of MSWIBA dosage and increased with the increase of cement reference. Replacing fine aggregate with MSWIBA reduced the water stability of CSBAM. The water stability was better when the bottom ash dosage was more than 20%. Bottom ash reduced the dry shrinkage strain of cement-stabilized macadam, and CSBAM had better anti-dry shrinkage performance. CSBAM had a curing effect on heavy metals, and the leaching concentration of heavy metals was in accordance with the standard, which had less impact on the environment.