【摘要】 脱硫石膏产生量大利用率低，利用脱硫石膏制备了微膨胀基层水泥，并通过扫描电镜、XRD、TG-DTG研究了脱硫石膏对基层水泥性能及早期水化的影响。结果表明：脱硫石膏掺量为13%时，缓凝效果最佳；随着脱硫石膏掺量的增加，抗折及抗压强度呈现先增加后降低的趋势，且在9%处达到最大值；脱硫石膏掺量增加可促进早期钙矾石的形成，但对水泥浆体中Ca（OH）₂的结晶析出有一定抑制作用；膨胀率随着龄期的延长及脱硫石膏掺量的增加而增大，高掺量脱硫石膏基层水泥后期膨胀率的增量高于低掺量。更多还原

【Abstract】 In order to realize efficient and high value-added utilization of desulphurized gypsum and improve the performance of road base cement,this paper studied the influence of desulphurized gypsum on the performance and early hydration of micro-expansion road base cement with different dosage by scanning electron microscopy,XRD and TG-DTG.When the content of desulfurized gypsum is 13%,the retarding effect is the best.With the increase of desulfurized gypsum content,the flexural and compressive strength decrease and reach a maximum value at 9%.The addition of desulfurized gypsum can promote the formation of ettringite in early stage,but inhibit the crystallization of Ca（OH）₂ in cement slurry to a certain extent.The increment of expansion rate of high content desulfurized gypsum base cement is higher than that of low content.更多还原