Influence of additives on properties of concrete with recycled aggregate and fly ash

Abstract

It is possible to considerably enhance the environmental friendliness of concrete production by increasing the usage of recycled concrete aggregate (RCA) and supplementary cementitious materials (SCM) in concrete industry [1, 2]. The idea of concrete with recycled concrete aggregate (RCA), additives such as microsilica, metakaolin, fluidized fly ash and superplasticizers might be controversial - it assumes usage of waste material and expensive additives - it is popular though. The aim of this paper was to determine, what the frost resistance of such concrete is. Additionally tests of other properties (sorptivity, absorbability and air void parameters) were performed.