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利用XRD、SEM、差热分析和水化热分析等方法研究不同细度和不同掺量固硫灰对水泥物理性能和水泥水化的影响。结果表明,当固硫灰掺量为10%～30%时,水泥安定性、凝结时间均符合国家标准;水泥强度随固硫灰细度的增加而增加,随固硫灰掺量的增加先增加后降低,其最佳掺量为20%;适量的固硫灰,能促进早期C2S、C3S水化,固硫灰细度越细,水泥早期水化速率越快,并影响其早期水化产物的形成;固硫灰掺入后,水泥的水化产物主要为钙矾石、C-S-H、氢氧化钙,并改善了水化产物的热稳定性,同时固硫灰掺量的变化会导致水泥中硫含量的变化,使得C3A水化的最终产物有所不同。
XRD, SEM, differential thermal analysis and hydration analysis were used to study the effects of different fineness and different content of sulfur-fixing ash on physical properties of cement and hydration of cement. The results show that the cement stability and setting time meet the national standards when the sulfur content is 10% ~ 30%. The cement strength increases with the increase of the fineness of the sulfur-fixing ash. With the increase of the content of the sulfur-fixing dust Increase and then decrease, the best content is 20%. The appropriate amount of sulfur-fixing ash can promote the early hydration of C2S and C3S. The finer the fineness of solidified sulfur ash, the faster the hydration rate of cement and the early hydration The formation of the product; the sulfur hydrosulfite mixed, the cement hydration products are mainly ettringite, CSH, calcium hydroxide, and improve the thermal stability of the hydration products, while changes in the amount of sulfur fixation will lead to cement Changes in the sulfur content, making C3A hydration of the final product is different.