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采用水化微量热仪研究了不同类型聚羧酸减水剂对不同晶型C3S水化放热特性的影响。结果表明:单斜晶系(M)C3S、三方晶系(R)C3S的水化放热速率峰值相比三斜晶系(T)C3S显著降低,且水化放热峰出现延迟,MC3S的水化放热峰延迟最明显。三种晶型C3S的3d水化放热总量由大到小为:TC3S、MC3S、RC3S。不同分子结构的甲氧基聚乙二醇甲基丙烯酸酯系聚羧酸减水剂,主链越短,支链越长,对TC3S的水化延迟作用越大。乙烯基聚乙二醇醚系聚羧酸减水剂对三种晶型C3S的水化放热过程延迟作用由大到小为:RC3S、MC3S、TC3S。对水化放热曲线进行的Krstulovic-Dabic模型研究表明,C3S的水化过程为NG-D类型水化历程。
The effects of different types of polycarboxylate superplasticizers on the hydration and exothermicity of C3S with different crystal types were studied by hydration microcalorimetry. The results show that the peak value of hydration exothermic rate of monoclinic (M) C3S and trigonal (R) C3S is significantly lower than that of triclinic (T) C3S, and the hydration exothermic peak is delayed. Hydration exothermic peak delay the most obvious. The three crystals C3S 3d hydration exothermic total descending: TC3S, MC3S, RC3S. Different molecular structure of methoxy polyethylene glycol methacrylate polycarboxylate superplasticizer, the shorter the backbone, the longer the branch, the greater the delay of hydration of TC3S. The retardation effect of vinyl polyglycol ether polycarboxylate superplasticizer on the hydration process of three kinds of crystal C3S from big to small is: RC3S, MC3S, TC3S. The Krstulovic-Dabic model study on the hydration exotherm shows that the hydration process of C3S is the NG-D type hydration process.