矿物掺合料混凝土碳化性能试验研究

通过快速碳化试验,综合考虑水胶比、掺合料种类、掺量等因素,对掺合料混凝土碳化规律进行了研究.结果表明:低水胶比是保证掺合料混凝十具有较高抗碳化能力的重要手段之一.掺合料总掺量相同时,掺合料混凝土抗碳化能力从高到低依次为:三掺粉煤灰+矿渣+硅灰,双掺粉煤灰+矿渣,双掺粉煤灰+硅灰,单掺矿渣,单掺粉煤灰,单掺硅灰.合理双掺粉煤灰+矿渣或三掺粉煤灰+矿渣+硅灰,不仅能使混凝土获得满足要求的抗碳化能力,还可以大大提高水泥取代量.

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 con-taining mineral admixtures (fly ash (FA), ground granulted blastfurnace slag (GGBS), silica fume (SF)). As total amounts of admix-tures 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.