Use of Desulphurizing Slag in Non-autoclaved Aerated Concrete

Laboratory experiments were performed using Desulphiffizing Slag (DS) to replace sulfate,part of lime and fly ash in non-autoclaved aerated concrete mixtures. The effects of water /binder ratio, casting-temperature and aluminum powder fineness on the pore-forming behaviot; and those of desulphurizing slag dosage, fly ash dosage and aluminum powder dosage on the compressive strength and bulk density of aerated concrete were investigated. The hydration products and the microstructure were analyzed by XRD and SEM. Results showed that the main physical-mechanical properties of Non-autoclaved aerated concrete made by the optimal raw material formulation and procedure conform with the requirements of aerated concretes of grade B05, and the hydration products are needle-like ettringite and flocculent hydrated calcium silicate.