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《Concrete》 2007-12
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Effect of surface coating of aggregate by admixture on properties of recycled aggregate concrete

LEI Ting,KONG De-yu,ZHENG Jian-jun(College of Civil Engineering & Architecture,Zhejiang University of Technology,Hangzhou 310014,China)  
A novel mixing method was applied to realize surface coating of aggregate by admixture for further improving microstructure of interfacial transition zone(ITZ) and properties of recycled aggregate concrete(RAC).Effects of mixing methods,slump of the fresh concrete and coating by various admixtures on compressive strength and chloride ions penetration resistance of RAC were investigated.The results show that compressive strength and chloride ions penetration resistance of the concrete can be further enhanced through surface coating of admixture around the aggregates during mixing,as compared to that by the surface-coating-by-cement mixing method,especially at early ages.Increasing slump of the fresh concrete helps enhance compressive strength but weakly harm the chloride ions penetration resistance of the hardened RAC for both mixing methods.However,the negative effects of increasing slump on properties of RAC can be reduced by using the surface-coating-by-admixture mixing method.Using slag as admixture helps improving properties of RAC as compared by using fly ash.
【Fund】: 杭州市科技局计划项目(200433134);; 浙江省建设厅科技计划项目(0642)
【CateGory Index】: TU528
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【Citations】
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