Research on the Mechanical Properties of Filling Body Prepared by Mixing Incineration Fly Ash with Bottom Slag of Municipal Solid Waste
In order to handle the municipal waste incineration products(incineration fly ash and incineration bottom slag),the feasibility of using incineration fly ash and incineration bottom slag as a substitute for part of cement in the field of mine filling was studied from the perspective of collaborative utilization of solid waste.Incineration fly ash and incineration bottom slag of municipal waste were mixed to prepare filling body,and then uniaxial compressive strength tests on filling body with curing ages of 3,7,and 28 d were carried out.A compressive strength regression model was established based on mixture experiments design,and the influence of different dosages of incineration fly ash and incineration bottom slag on the mechanical properties of the filling body was analyzed using response surface methodology,and the optimal mixing proportion was obtained.The research results indicate that when the incineration fly ash is 35.3％,the incineration bottom slag is 40.4％,the cement is 24.3％,and the mass concentration is 70％,the mechanical property indicators of the filling body reach the optimal value.Adding an appropriate amount of incineration fly ash and incineration bottom slag can prolong the hydration reaction process and significantly improve the degree of hydration reaction in the cementitious system.According to XRD test and SEM observation,the main hydration products are hydrated calcium silicate and ettringite,which form a dense network structure inside the filling body and improve the mechanical properties of the filling body.
万方数据
维普
