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根据不同的脱硫反应温度,脱硫灰可区划为高温炉膛灰和低温烟气灰,因此在粉煤灰中掺入不同质量比的Ca SO4·2H2O后分两组,分别在100℃烘焙及900℃煅烧来模拟这两类脱硫灰。通过工作性、强度、护筋性试验研究了不同脱硫灰对材料性能影响规律。试验结果表明:与普通粉煤灰比较,高温区及低温区脱硫灰均可改善流动性,但其影响规律不同,高温区脱硫灰对浆体流动性改善作用弱于低温区脱硫灰,且灰中的石膏含量对流动性影响存在临界值;脱硫灰均降低强度,且高温区灰早期强度比低温区的高,但后期强度相反;两区灰对钢筋无害,对钢筋钝化膜致密性强弱依次是低温区>高温区>粉煤灰。
According to different desulfurization reaction temperature, desulfurized ash can be divided into high temperature furnace ash and low temperature flue gas ash, so fly ash mixed with different mass ratio of Ca SO4 · 2H2O divided into two groups, respectively, at 100 ℃ baking and 900 ℃ Calcination to simulate these two types of desulfurization ash. The influences of different desulphurization ash on the properties of materials were studied by the workability, strength and bar protection experiment. The results show that compared with ordinary fly ash, the desulfurization ash can improve the fluidity in high temperature zone and low temperature zone, but the influence law is different. The desulfurization ash in the high temperature zone has less effect on the slurry fluidity improvement than the desulfurization ash in the low temperature zone, and the ash The gypsum content of the fluidity of the impact of the existence of a critical value; desulfurization ash all reduce the strength, and high temperature ash early strength than the low temperature zone, but the late strength opposite; two gray ash harmless to the steel passivation film densification The order of strength is low temperature zone> high temperature zone> fly ash.