首页|Characteristics of Typical Calcium Aluminate Cement and Influence on Hydration Heat of Castables
Characteristics of Typical Calcium Aluminate Cement and Influence on Hydration Heat of Castables
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Two kinds of pure calcium aluminate cement(CAC)prepared by the sintering method and the electric melting method,respectively were analyzed in terms of the particle size,XRD patterns and hydration characteristics;and their effects on the hydration heat and construction performance of the cement-based castables were discussed.It is found that(1)the electric fused CAC contains 50.67％CA and 44.89％CA2,while the sintered CAC contains 74.57％CA and 22.97％CA2;in addition,compared to the sintered CAC,the electric fused CAC contains more C3A,C12A7,and a small amount of amorphous phase;(2)the electric fused CAC(d50 of 7.93 μm)has much smaller particle size than the sintered CAC(d50 of 12.51 μm);(3)in the early stage of hydration,the exothermic peak of the electric fused CAC appears earlier and the heat flow rate is higher than that of the sintered CAC;the dormant period of the sintered CAC is relatively short and the main exothermic peak appears earlier than that of the electric fused CAC;(4)for cement-based castables,there is no obvious exothermic peak in the early hydration stage,but the temperature of the castables slightly increases;among them,the initial hydration temperature of the electric fused CAC-based castable is higher;and the main exothermic peak of the sintered CAC-based castable appears later than that of the electric fused CAC-based castable;(5)the exothermic heating on-site occurrs earlier,which is related to the higher environmental temperature(about 30 ℃);the on-site electric fused CAC-based castable begins to show more cracks during the exothermic peak stage.
pure calcium aluminate cementsintering methodelectric melting methodhydration exothermic peak
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维普
