CARBONATION TEST OF CONCRETE CONTAINING MINERAL ADMIXTURES

The accelerated carbonation test was carried out at various water-binder ratios, admixture types and admixture replacement. The results show that a lower water-binder ratio is one of the important means to improve the carbonation resistance of concrete containing mineral admixtures (fly ash (FA), ground granulted blastfurnace slag (GGBS), silica fume (SF)). As total amounts of admixtures are equivalent, the carbonation resistance of admixture concretes from high to low is as follows: FA+GGBS+SF, FA+GGBS, FA+SF, GGBS, FA, SF. The carbonation resistance of concrete can meet the requirement in application. The cement replacement can be greatly increased when FA, GGBS and SF are incorporated into concrete.