摘要：采用蒸汽动能磨对水泥缓凝剂 (磷石膏) 进行超细加工, 将质量分数为4%的超细加工前后的磷石膏 (PG₀和PG₃₅) 与水泥熟料 (C) 混合制备胶凝材料, 研究超细磷石膏作缓凝剂对水泥基材料性能的影响;超细加工后的磷石膏粒径和含水率明显降低, 制备的水泥基材料的凝结时间满足GB 175—2007, 28 d抗压强度显著提高, 孔隙率降低了11.32%;同时其水化放热速率加快, 累积放热量增加。XRD和SEM分析表明, PG₀-C和PG₃₅-C这2组水泥的主要水化产物为Ca (OH) ₂和C-S-H凝胶;PG₃₅-C水泥浆体中有钙矾石生成, 微观结构更为致密。

关键词：蒸汽动能磨；超细磷石膏；缓凝剂；水泥基材料

Abstract：The cement retarder (phosphogypsum) was ultra-fine processed by superheated steam powdered jet mill.The phosphogypsum (PG₀) and superfine phosphogypsum (PG₃₅) which mass fraction were 4%were mixed in cement clinker (C) to prepare a cement-based material respectively.And the effect of ultrafine phosphogypsum as retarder on the properties of cement-based materials were studied.The particle size and moisture content of phosphogypsum after ultra-fine processed are significantly reduced, and the setting time of cement-based materials prepared from superfine phosphogypsum conforms GB175-2007.The compressive strength for 28 d of cement hardenite with superfine phosphogypsum is significantly increased.The porosity is decreased by 11.32%and the rate of hydration heat release is accelerated.XRD and SEM analysis show that the hydration products of PG₀-C and PG₃₅-C cements are Ca (OH) ₂and C-S-H gels.However, the ettringite is also formed in the hardenite of PG₃₅-C cement, which results in a much denser microstructure of the hardenite.

Keywords：superheated steam powdered jet mill；superfine phosphogypsum powder；retarder； cement-based materials