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.
维普
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