磷石膏-低碱度硫铝酸盐水泥胶凝体系及其水化机理研究  

Study on cementing system of phosphogypsum-low alkalinity sulfoaluminate cement and its hydration mechanism

作　　者：阳黎 张水建 王宁 夏艳晴 田晓苏[1,2] YANG Li(iahua Special Cement Co.LTD.,Leshan 614003,Sichuan,China)

机构地区：[1]嘉华特种水泥股份有限公司,四川乐山614003 [2]中国建材集团有限公司,北京100036 [3]西南科技大学,四川绵阳621010

出　　处：《水泥》2024年第8期17-22,共6页Cement

摘　　要：研究了在低碱度硫铝酸盐水泥(L-SAC)中添加10%~50%改性磷石膏(WHPG)的混合胶材材料体系的凝结时间、胶砂强度、pH等性能,并分析了WHPG在体系中对强度、pH及凝结时间的作用机理。结果表明:WHPG自身缺陷和快速水化等特性会导致标准稠度用水量增加,也会缩短胶凝体系的凝结时间;少量WHPG的添加会降低L-SAC的实际水灰比,也会促进钙钒石的生成,提升坯体的密实性,增加强度;WHPG呈弱酸性,随着WHPG掺量的增加,pH随之降低,WHPG不断消耗L-SAC水化生成的碱性物质,导致后期pH更低;磷石膏-低碱度硫铝酸盐水泥胶凝体系各项性能非常适用于喷射植生混凝土。The setting time,mortar strength and pH of the mixed cementitious material system with 10%~50%modified phosphogypsum(WHPG)added to L-SAC were studied,and the effect mechanism of WHPG on the strength,pH and setting time was analyzed.The results show that the water consumption of standard consistency will increase and the setting time of the gelling system will be shortened due to the defects and rapid hydration properties of WHPG.The addition of a small amount of WHPG can reduce the actual water-cement ratio of L-SAC,promote the formation of ettringite,improve the compactness of the body and increase the strength.WHPG is weakly acidic,so pH decreases with the increase of WHPG content.WHPG continuously consumes alkaline substances generated by L-SAC hydration,resulting in lower pH in later stage.The properties of phosphogypsum-low alkalinity sulfoaluminate cement cementing system are very suitable for jet planting concrete.

关 键 词：植生混凝土 改性磷石膏 低碱度硫铝酸盐水泥 耐久性 碱度 

分 类 号：TQ172.462[化学工程—水泥工业] TQ172.7[化学工程—硅酸盐工业]