养护湿度对CAC结合浇注料脱模强度的影响  

Effect of curing humidity on demoulding strength of CAC bonded castables

作　　者：孙小改 李耀征 贾会霞 张毅清 穆元冬 张忠壮 叶国田 Sun Xiaogai;Li Yaozheng;Jia Huixia;Zhang Yiqing;Mu Yuandong;Zhang Zhongzhuang;Ye Guotian(City University of Zhengzhou,Department of Materials and Engineering,Zhengzhou 452370,China;Zhengzhou University,School of Materials Science and Engineering,Zhengzhou 450001,China)

机构地区：[1]郑州城市职业学院材料工程学院,郑州452370 [2]郑州大学材料科学与工程学院,郑州450001

出　　处：《耐火与石灰》2024年第4期15-19,共5页Refractories & Lime

摘　　要：以板状刚玉、氧化铝微粉、铝酸钙水泥为原料制备浇注料,研究了50℃时两种养护湿度(RH=30%,RH=80%)对CAC结合浇注料脱模抗折强度和耐压强度的影响。结果表明:1)CAC结合浇注料在低湿度下(RH=30%)养护比在较高湿度(RH=80%)养护的脱模强度更高;2)CAC结合浇注料在较低湿度下养护时,生成了板片状的水化物相C2AH8和AH3,板片状的C2AH8形成的相互交错网络互锁结构可为浇注料提供较高的脱模强度;3)CAC结合浇注料养护湿度提高至RH=80%,水化产物C2AH8逐渐转化生成C3AH6和AH3,粒状的水化产物C3AH6与试样内部各组分之间空隙大幅增加,造成高湿度条件下养护浇注料强度降低。Castables were prepared using tabular corundum,alumina powder,and calcium aluminate cement as raw materials.The effects of curing humidities(RH=30%and RH=80%)on demoulding strength of castables were studied.The results show that:1)The demoulding strength of CAC bonded castables is higher when cured at lower humidity(RH=30%)than cured at higher humidity(RH=80%);2)The main hydration products generated are C2AH8 and AH3 cured at low humidity(RH=30%),the interlocked structure of interlaced network formed by flaky C2AH8 can provide demoulding strength for castable;3)When curing humidity increases to RH=80%,the hydration product C2AH8 gradually transforms to C3AH6 and AH3,the significant increase in voids between the granular hydration product C3AH6 and the internal hydration product of the sample,leads to a decrease the demoulding strength of castable under high humidity conditions.

关 键 词：铝酸钙水泥 浇注料 养护 湿度 脱模强度 

分 类 号：TQ175.732[化学工程—硅酸盐工业]