摘要
为了研究铁尾矿粉作为掺合料对大体积混凝土水化热的影响,对比研究了铁尾矿粉-水泥复合胶凝材料(MITC)、粉煤灰-水泥复合胶凝材料(MFAC)的水化放热特点。制作了C40强度等级,边长为1100 mm的大体积铁尾矿粉混凝土(ITPC)以及粉煤灰混凝土(FAC)立方体试块,每一试块内部埋设15个温度传感器,对不同龄期混凝土温度变化进行了试验研究。并通过ANSYS软件模拟了试验试块的温度场。研究结果表明粉煤灰对复合胶凝材料水化放热速率及峰值出现时间的延缓效果优于铁尾矿粉,但大体积ITPC与FAC的温升峰值分别为61.9℃、63℃;中层降温速率分别为0.46℃/h,0.51℃/h;最大里表温差分别为18.5℃,20.4℃,大体积FAC的温升峰值、中层降温速率、最大里表温差均高于大体积铁尾矿粉混凝土。从对大体积混凝土温度降低效果来看,铁尾矿粉优于粉煤灰。ANSYS软件数值模拟结果与试验实测结果吻合良好,ITPC试块与FAC试块中心点相对误差分别为0.65%,1.43%。可以较好的模拟出大体积ITPC内部的温度变化,为实际工程的现场施工及温控措施提供指导。
To study the influence of iron tailings powder as an admixture on the hydration heat of mass concrete,the hydration exothermic characteristics of iron tailings powder cement composite cementitious material(MITC)and fly ash cement composite cementitious material(MFAC)were compared.The C40 strength grade test cubes of mass iron tailings powder concrete(ITPC)and fly ash concrete(FAC)with side length of 1100 mm were made,15 temperature sensors were buried inside each test block,and the temperature changes of concrete at different ages were tested.The temperature field of the test block is simulated by ANSYS software.The research results show that the retarding effect of fly ash on the hydration exothermic rate and peak time of composite cementitious materials is better than that of iron tailing powder,However,the peak temperature rise of mass ITPC and FAC are 61.9℃and 63℃respectively;The cooling rates of the middle layer are 0.46℃/h and 0.51℃/h respectively;The maximum internal surface temperature difference is 18.5℃and 20.4℃respectively,The peak value of temperature rise,cooling rate of middle layer and maximum temperature difference between interior and exterior of mass FAC are higher than that of mass ITPC.From the perspective of temperature reduction effect of massconcrete,iron tailings powder is superior to fly ash.The numerical simulation results of ANSYS software are in good agreement with the test results,The relative error of the center point of ITPC test block and FAC test block is 0.65%and 1.43%respectively,which can better simulate the internal temperature change of mass ITPC,and provide guidance for the on-site construction and temperature control measures of actual projects.
作者
孙建恒
陈若妤
袁敬
SUN Jian-heng;CHEN Ruo-yu;YUAN Jing(College of Urban and Rural Construction/Hebei Agriculture University,Baoding 071001,China)
出处
《山东农业大学学报（自然科学版）》
北大核心
2023年第3期440-446,共7页
Journal of Shandong Agricultural University：Natural Science Edition
基金
河北省重点研发计划项目(19211502D)。
关键词
铁尾矿粉混凝土
水化热
数值模拟
Iron tailings concrete
heat hydration
numerical simulation
作者简介
第1作者:孙建恒(1962-),博士研究生,教授,博士生导师,主要研究方向为混凝土材料与钢结构.E-mail:sjh@hebau.edu.cn;通讯作者:陈若妤.E-mail:18233186513@163.com。
