偏高岭土对碱矿渣水泥耐高温性能的影响  

Effect of metakaolin on high temperature resistance of alkali activated slag cement

作　　者：吕淑莲[1] 雷华 程臻赟 LYU Shulian;LEI Hua;CHENG Zhenyun(Department of Environmental Engineering,Ningxia College of Construction,Yinchuan 750021,China;School of Civil Engineering,North Minzu University,Yinchuan 750021,China)

机构地区：[1]宁夏建设职业技术学院环境工程系,宁夏银川750021 [2]北方民族大学土木工程学院,宁夏银川750021

出　　处：《混凝土与水泥制品》2024年第11期100-105,共6页China Concrete and Cement Products

基　　金：宁夏回族自治区自然科学基金项目(2021AAC03187、2021AAC03187);国家自然科学基金项目(51668001)。

摘　　要：对比研究了不同掺量的偏高岭土(0、10%、30%)对碱矿渣水泥在20~1000℃高温作用下的外观形貌和抗压强度的影响,并进行了XRD、FT-IR和SEM分析。结果表明:当温度不大于400℃时,不同偏高岭土掺量试件的外观形貌和抗压强度均无明显变化;当温度升至600℃时,体系中的水化产物C-S-(A)-H凝胶脱水,试件内部结构出现微裂纹,抗压强度下降,但掺入适量偏高岭土能在一定程度上减少抗压强度损失;当温度达到1000℃时,未掺偏高岭土试件的固相反应产物主要为钙黄长石晶体颗粒,且颗粒之间较为松散,微观结构密实度较低,而掺偏高岭土试件的固相反应产物主要为钠长石,微观结构呈空间网状,密实度较高,耐高温性能相对较好。A comparative study was conducted on the effects of different contents of metakaolin(0,10%,30%)on the appearance and compressive strength of alkali activated slag cement under high temperature conditions of 20~1000℃,and XRD,FT-IR,and SEM analyses were conducted.The results show that when the temperature is not greater than 400℃,there is no significant change in the appearance and compressive strength of specimens with different metakaolin content.When the temperature rises to 600℃,the hydration product C-S-(A)-H gel in the system will be dehydrated,and the internal structure of the specimen will appear microcracks,reducing the compressive strength.However,the compressive strength loss can be reduced to a certain extent by adding appropriate content of metakaolin.When the temperature reaches 1000℃,the solid reaction product of the specimen without metakaolin is mainly calcium feldspar crystal particles,and the particles are relatively loose with low microstructure density.On the other hand,the solid reaction product of the specimen with metakaolin is mainly sodium feldspar,with a spatial network structure,high density,and relatively good high temperature resistance.

关 键 词：碱矿渣水泥 偏高岭土 耐高温性能 强度 微观结构 

分 类 号：TU528.01[建筑科学—建筑技术科学]