Test study on mechanical properties of compound municipal solid waste incinerator bottom ash premixed fluidized solidified soil

In this paper, the municipal solid waste incineration bottom ash (MSW-IBA) is used as the fine aggregate and firming agent component of the premixed fluid stabilized soil (PFSS). Through the mechanical strength test, and the hydration products and microstructure characterization, the effects of the NaOH content for MSW-IBA pre-aging treatment and activator content on the mechanical properties of the PFSS are studied. The results show that the mechanical strength of the prepared PFSS is closely related to the amount of NaOH and the activator. The increase in the amount of NaOH and activator can affect the formation of early hydration product Aft, and reduce the early strength. However, it can promote the depolymerization of glass phase in MSW-IBA and slag to form C-(A)-S-H and Mg-(A)-S-H gel, increase the microstructure density, and thus improve the late strength. The application of MSW-IBA in PFSS can achieve the recycling of solid waste.