DEF damage in heat cured mortars made of recycled concrete sand aggregate

Abstract The purpose of this study is to investigate DEF development in heat cured mortars made of recycled sand aggregate with sodium sulphate or gypsum plaster powder additions to stimulated DEF development. Ten different formulations have been studied for more than a year. DEF damage comparison between different mortars made of RCA sand and standardised siliceous sand is made with or without sulphate addition. Sodium sulphate was used in three formulations at 5% of total SO3 by cement weight, while gypsum plaster powder was used in four formulations with two different fineness (