Effect of Desulfurization Ash with Different Calcium Sulfite Content on Performance of Cement Based Materials
According to the desulphurization reaction temperature and the content of calcium sulfite, FGD ash is simulated, that is the ordinary fly ash mixed with different weight percentage of CaSO3·1/2H2O is followed by drying at 100°C. And then by the experiment of workability, strength, sulfate resistance and rebar corrosion, the effect of the fly ash with different of CaSO3·1/2H2O on material properties are studied. The results show that: compared with ordinary fly ash, the desulphurization ash contained 4~12% CaSO3·1/2H2O can improve workability, but it has a 4% threshold, over critical value, the improving ability declined; secondly increasing the content of CaSO3·1/2H2O in desulphurization ash can decrease strength, and while the effect of 7 day strength is higher than 28 days’; Thirdly, with the increase of calcium sulfite, the desulphurization can decrease resistance to sulfate attack , especially for more than content of 8% CaSO3·1/2H2O , but it is harmless for steel rebar.
Guangfan Li, Yong Huang and Chaohe Chen
X. D. Wen et al., "Effect of Desulfurization Ash with Different Calcium Sulfite Content on Performance of Cement Based Materials", Advanced Materials Research, Vols. 250-253, pp. 1054-1057, 2011