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Hydration heat evolution of Portland cement paste during unsteady steam curing process: Modelling and optimization
Thermochimica Acta ( IF 3.5 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.tca.2020.178784
Jionghuang He , Guangcheng Long , Kunlin Ma , Youjun Xie , Cong Ma

Abstract The hydration process under unsteady steam curing condition is difficult to monitor in real time by experimental method. This study developed a numerical method to describe the hydration heat release characteristics of Portland cement under atmospheric steam curing condition. Instantaneous activation energy and an iterative algorithm were employed in this method to improve the accuracy. It was found that prolonging the precuring time to over 7 h or heating time to over 3 h would both decrease the peak value of hydration heat release rate, while a treatment time over 8 h would slightly affect the total heat release during steam curing. The validity of the method was confirmed by the experimental results. This proposed method can rapidly analyze the effect of steam curing regimes on hydration heat release behavior of Portland cement and thus optimize the hydration process of Portland cement under steam curing process in order to mitigate or avoid heat damage of steam curing concrete.

中文翻译:

非稳态蒸汽养护过程中硅酸盐水泥浆体的水化热演化:建模与优化

摘要 不稳定蒸汽养护条件下的水化过程难以通过实验方法实时监测。本研究开发了一种数值方法来描述波特兰水泥在常压蒸汽养护条件下的水化放热特性。该方法采用瞬时激活能和迭代算法来提高精度。研究发现,将预固化时间延长至 7 h 以上或加热时间延长至 3 h 以上,均会降低水化放热率峰值,而处理时间超过 8 h 会对蒸汽固化过程中的总放热量产生轻微影响。实验结果证实了该方法的有效性。
更新日期:2020-12-01
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