The Performance And Application Of Concrete Mixed With Fly Ash And Slag From Incineration Power Plants

With the development of urbanization,the output of garbage in cities is increasing day by day.Through the construction of waste incineration power plant,waste reduction can be realized and the heat energy generated by waste incineration can be fully utilized.However,a large amount of fly ash and slag are produced after incineration.If these slags cannot be disposed properly,it will cause secondary pollution to soil and groundwater.Fly ash and slag from incineration of waste power plant can be applied to building materials industry,which can realize resource utilization of waste and protect ecological environment.This paper has carried out the waste incineration power plant burning ash product applied to the study of concrete fly ash to replace partial cement,slag to replace part of coarse aggregate,by compressive strength test,confirm the best replacement ratio of ash,through experiment fields.Therefore,garbage burned power plant ash analysis the influence mechanism of concrete strength.Through heavy metal leaching experiment,the feasibility of applying it in production practice was confirmed.The optimum proportion confirmed by the compression test is used to make the concrete pavement brick,and the mechanical properties and durability of the pavement brick are confirmed to meet the requirements of GB28635-2012.Through the above studies,the conclusions are as follows:(1)Eplace the cement and coarse aggregate in C30 concrete by 10%,20% and 30% respectively for fly ash and slag from incineration products of waste power plants.According to the analysis of compressive strength,when the replacement rate of fly ash for cement is 30%,and the replacement rate of slag for coarse aggregate is 20%.The compressive strength of the cube can reach 42 MPa,and the substitution rate is the best.(2)It can be concluded from the characterization test that the surface morphology of slag is relatively loose and the distance between particles is relatively large,which can make aggregate gradation better when applied to concrete.The structure of fly ash is the densest,and its surface morphology and composition are similar to cement and fly ash.There are a lot of cementitious substances between the concrete particles with ash and slag,and both fly ash and slag are involved in the hydration reaction of concrete.(3)Determination of Cu,Zn,Gr,Gd,Pb and other heavy metals in undisturbed fly ash,slag and slag-mixed concrete.The results showed that the leaching amount of heavy metals decreased with the increase of pH value under different pH values,and the alkaline condition of concrete was beneficial to the solidification of heavy metals in fly ash and slag.The leaching amount of heavy metals in concrete is lower than the standard value.(4)The surface morphology,compressive strength,flexural strength,abrasion resistance and frost resistance of the pavement brick are measured to meet the requirements of the national code for concrete pavement brick.(5)The economic analysis of the concrete pavement brick with ash and slag shows that the concrete pavement brick with fly ash and slag has certain economic,environmental and social benefits.It can not only save cost,but also realize the purpose of waste utilization and environmental protection.