Research On The Application Of Municipal Solid Waste Incineration Bottom Ash In Cement-stabilized Base

Municipal solid waste incineration for power generation can make full use of the calorific value of waste,and also eliminate a large number of harmful germs and toxic substances in waste,which is an ideal way to treat waste.The residue after incineration is divided into bottom ash and fly ash,of which bottom ash accounts for about 80% of the total mass of the residue and is a general solid waste with certain strength and particle size distribution.The production of bottom ash is extremely large,but the ways of resource utilization are very limited.Excess bottom ash will be disposed of in landfills,which not only wastes resources,but also increases the landfill area and disposal costs.If bottom ash can be used as a material for road construction,it can realize the reuse of bottom ash,and also reduce the amount of natural aggregates and the cost of road construction,which has positive significance for carbon peaking,carbon neutral,environmental protection and sustainable development of road construction.In this paper,the bottom ash from the municipal solid waste incineration power plant in Songyuan City,Jilin Province was used as the research object to investigate the feasibility of bottom ash stabilized with cement for pavement base construction and to clarify the effect of bottom ash blending on the pavement performance of cement-stabilized macadam.In order to maximize the use of bottom ash,cement-stabilized bottom ash mixes were prepared by mixing bottom ash with fine crushed stuff at 50%,75% and 100% mass fractions for large dosing,and by replacing fine aggregates in cement-stabilized macadam with bottom ash at 0%,25%,38% and 50% mass fractions for small dosing.A series of mechanical properties tests and frost resistance tests were conducted to establish the intrinsic structure model of the compressive process of the mix,determine the ultrasonic wave velocity of the mix at different stages,and build a test road to test the actual effect of bottom ash road construction.The main conclusions of the study are as follows:(1)The greater the amount of bottom ash,the greater the optimum moisture content of the mixture,the smaller the maximum dry density,and the mechanical properties and frost resistance will be adversely affected,but the basic properties of the mixture with each bottom ash content meet the specifications requirements,in actual engineering,the amount of bottom ash,blending method and cement dosage can be adjusted according to the application layer.(2)The established segmented constitutive model can well simulate the stress-strain relationship in the compaction process of mixtures with different bottom ash contents,and can provide a basis for research on the deformation evolution law and mechanical behavior analysis of the cement-stabilized bottom ash base under load.(3)As the amount of bottom ash increases,the wave velocity of the mixture decreases.The ultrasonic wave velocity can reflect the internal changes of the mixture to a certain extent.The wave velocity has a good correlation with the strength.The wave velocity can be used to calculate the indoor test and field test.The mechanical properties of bases of different ages can be used as a reference for the quality inspection of cement-stabilized bases.(4)After one year of use,there is no disease phenomenon on the test road,and the core sample of the core test is intact and the side wall is smooth,which shows that the performance of the bottom ash pavement base is good.It is completely feasible to build the road base after stabilizing the bottom ash with cement,and has a good The economic benefits and energy saving and emission reduction effects are worthy of large-scale promotion and application.