磷酸改性钢渣粉复合氢氧化钙浆体早期水化与微观结构  

Early-age Hydration and Microstructure of Phosphoric Acid Modified Steel Slag Powder Blended Portlandite Pastes

作　　者：霍彬彬 陈春[1] 张亚梅[1] HUO Binbin;CHEN Chun;ZHANG Yamei(Jiangsu Key Laboratory of Construction Materials,School of Materials Science and Engineering,Southeast University,Nanjing 211189,China;State Key Laboratory of Coal Resources and Safe Mining,School of Mines,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China)

机构地区：[1]东南大学材料科学与工程学院,江苏省土木工程材料重点实验室,南京211189 [2]中国矿业大学矿业工程学院,煤炭资源与安全开采国家重点实验室,江苏徐州221116

出　　处：《材料导报》2023年第15期116-120,共5页Materials Reports

基　　金：国家自然科学基金(51778132,51972057)。

摘　　要：为探究磷酸改性钢渣粉在碱性水泥环境中早期水化能力的变化,对比研究了未改性与磷酸改性钢渣粉复合氢氧化钙浆体的水化热、水化产物与微观结构变化。结果表明:相比未改性钢渣粉复合氢氧化钙浆体,磷酸改性钢渣粉复合氢氧化钙浆体的水化放热峰前移并且放热速率升高,72 h水化放热量提升了16.8%;其在3 d、7 d和28 d时消耗更多的氢氧化钙,产生更多水化产物,导致浆体孔隙率下降。但由于磷酸根对活性硅酸盐矿物水化的延缓作用,磷酸改性钢渣复合氢氧化钙浆体的孔隙率由3 d水化至28 d时的下降程度弱于未改性组。Aiming to investigate the early-age hydration ability change ofphosphoric acid(PA)modified steel slag powder(SS)under alkaline cement environment,the hydration heat evolution,hydrates,and microstructure of the phosphoric acid modified SS(SSPA)and unmodified SS blended portlandite pastes were compared in this investigation.It is found that compared to SS blended portlandite pastes,the heat release peak of SSPA blended portlandite paste moves forward and accompanies with higher heat release value,resulting in an improvement of 16.8%in 72 h cumulative hydration heat.Additionally,SSPA blended portlandite paste consumes more content of portlandite at 3 d,7 d and 28 d,produces less pore and more hydrates.While due to the retard effect of PO_(4)^(3-)to the active calcium silicates,the decreased porosity in SSPA blended portlandite pastes from 3 d to 28 d is lower than that of the SS blended portlandite pastes.

关 键 词：钢渣粉 磷酸 改性 氢氧化钙 水化 微观结构 

分 类 号：TU528[建筑科学—建筑技术科学]