水淬对生活垃圾焚烧灰渣及其混凝土性能的影响OA

To improve the aggregate properties of municipal solid waste incineration bottom ash(bottom ash)and the strength of bottom ash concrete,a water quenching process was adopted to treat the bottom ash,the influence of water quenching treatment on the properties,mineral composition,and hydraulic properties of bottom ash aggregate was analyzed.Experimental tests were designed for bottom ash and water-quenched bottom ash concrete with three water-to-binder ratios(0.2,0.4,0.6)and three sand replacement rates(0％,50％,100％).The basic mechanical properties of bottom ash and water-quenched bottom ash concrete were studied,and a quantitative relationship formula for the mechanical properties of water-quenched bottom ash fine aggregate concrete was established.The results reveal that after water quenching treatment,the bulk density and apparent density of the water-quenched bottom ash increases to some extent,and the water absorption and crushing index values de-crease significantly.The water quenching treatment significantly reduces the crystallinity of bottom ash and improves its potential hydraulic properties.The toxic substance leaching from the water-quenched bottom ash meets the limits specified in the national standard.The compressive strength and splitting tensile strength of water-quenched bottom ash concrete are higher than those of bottom ash fine aggre-gate concrete but slightly lower than those of natural sand concrete under the same mixing conditions.Due to the potential hydraulic properties of water-quenched bottom ash,the long-term(90-180 d)strength growth rate of its concrete is higher than that of bottom ash fine aggregate concrete and ordinary natural sand concrete.The quantitative relationship formula established using the Poly 2D func-tion for water-quenched bottom ash fine aggregate concrete has a high correlation coefficient.