摘要
研究了大体积混凝土中粉煤灰和矿粉在热养护条件下对水泥早期抗压强度的影响,并通过水化热、XRD以及TGA等技术手段阐述了水化反应过程。结果表明:常温时,粉煤灰和矿粉加入均会大幅度降低早期强度;热养护时,粉煤灰-水泥体系的早期强度仍远低于空白组;但随着矿粉用量的增加和热养护温度的升高,体系早期强度与空白组的差距逐渐减小;50℃养护时,矿粉-水泥体系的早期强度高于空白组。这说明在热激发条件下,粉煤灰的早期火山灰反应仍然有限,但矿粉的早期水化活性显著提高,通过火山灰反应和自水化反应完成水化产物的积累。
This paper studied the influence of fly ash(FA)and ground granulated blast furnace slag(GGBS)in mass concrete on the early compressive strength of cement under thermal curing conditions,and discussed the hydration reaction process by hydration heat,XRD and TGA.The results show that the addition of FA and GGBS can greatly reduce the early strength at room temperature;the early strength of FA-cement system is still much lower than that of the blank group during thermal curing;however,with the increase of the amount of GGBS and the thermal curing temperature,the early strength of system is closer and closer to the blank group;the early strength of GGBS-cement system is higher than that of blank group when the curing temperature is 50℃.This indicates that under the condition of thermal excitation,the early temperature is 50℃.This indicates that under the condition of thermal excitation,the early pozzolanic reaction of fly ash is still limited,but the early hydration activity of mineral powder is significantly improved,and the accumulation of hydration products is completed through pozzolanic reaction and auto-hydration reaction.
作者
夏雨
高妮
王永维
刘竞怡
何文敏
XIA Yu;GAO Ni;WANG Yongwei;LIU Jingyi;HE Wenmin(Shaanxi Engineering Laboratory of High Performance Concrete,Weinan 714000,China;School of Surveying&Testing,Shaanxi Railway Institute,Weinan 714000,China)
出处
《粉煤灰综合利用》
CAS
2024年第1期6-12,共7页
Fly Ash Comprehensive Utilization
基金
陕西省教育厅2023年度青年创新团队科学研究计划项目(23JP027)
陕西铁路工程职业技术学院科研基金项目(KY2021-67)
陕西铁路工程职业技术学院中青年科技创新人才(KJRC202103)
陕西铁路工程职业技术学院科技创新团队(KJTD202102)。
关键词
粉煤灰
矿粉
热养护
水化过程
水化产物
fly ash
ground granulated blast furnace slag
thermal curing
hydration process
hydration product
