第42卷第7期2023年7月硅酸盐通报BULLETINOFTHECHINESECERAMICSOCIETYVol.42No.7July,2023单掺粉煤灰和矿渣粉对磷酸镁水泥水化进程及强度的影响刘进1,韩达1,张增起2(1.北京城建集团有限责任公司,北京100088;2.北京科技大学冶金与生态工程学院,北京100083)摘要:以石英粉作为参照,通过监测水化热、悬浮液pH值及凝结时间变化研究了粉煤灰和矿渣粉(GGBS)对磷酸镁水泥水化进程的影响,并测定了砂浆的抗压强度及硬化浆体的孔结构。结果表明,粉煤灰和矿渣粉对磷酸镁水泥的水化具有较强的延缓作用,且矿渣粉的缓凝效果更强。粉煤灰和矿渣粉能够改善硬化浆体的孔结构,其中矿渣粉的改善效果更为显著。在15%(质量分数)掺量下,单掺粉煤灰和矿渣粉的磷酸镁水泥砂浆2h抗压强度都略高于纯磷酸镁水泥砂浆。掺粉煤灰的磷酸镁水泥砂浆后期抗压强度等于或略高于纯磷酸镁砂浆,掺矿渣粉的磷酸镁水泥砂浆后期抗压强度显著高于纯磷酸镁水泥砂浆。关键词:粉煤灰;矿渣粉;磷酸镁水泥;水化进程;抗压强度;孔结构中图分类号:TQ172文献标志码:A文章编号:1001-1625(2023)07-2472-07EffectsofSingle-DopedFlyAshandGGBSonHydrationProcessandStrengthofMagnesiumPhosphateCementLIUJin1,HANDa1,ZHANGZengqi2(1.BeijingUrbanConstructionGroupCo.,Ltd.,Beijing100088,China;2.SchoolofMetallurgicalandEcologicalEngineering,UniversityofScienceandTechnologyBeijing,Beijing100083,China)Abstract:Takingquartzpowderasareference,theeffectsofflyashandgroundgranulatedblastfurnaceslagpowder(GGBS)onthehydrationprocessofmagnesiumphosphatecementwereresearchedbymonitoringthechangesofhydrationheat,suspensionpHvalueandsettingtime.Inaddition,thecompressivestrengthofmortarandporestructureofhardenedpasteweredetermined.TheresultsshowthatflyashaswellasGGBShavestrongdelayingeffectsonthehydrationofmagnesiumphosphatecement,andthedelayingeffectofGGBSisstronger.FlyashandGGBScanimprovetheporestructureofhardenedpaste,andtheimprovingeffectofGGBSismoresignificant.Whenthereplacementratiois15%(massfraction),thecompressivestrengthofmagnesiumphosphatecementcontainingflyashorGGBSishigherthanthatofpuremagnesiumphosphatecementat2h.Thecompressivestrengthofmagnesiumphosphatecementcontainingflyashisequaltoorhigherthanthatofpuremagnesiumphos...
