砂浆水泥干燥过程中水分扩散系数的测定:实验与模型研究

L. Bennamoun, Loubna Kahlerras, F. Michel, L. Courard, T. Salmon, L. Fraikin, A. Belhamri, Angélique Léonard
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引用次数: 8

摘要

本研究的目的是对一种新型砂浆在对流干燥过程中的行为进行实验表征。我们关注的是水灰比为0.5的砂浆。干燥试验是在微型对流干燥机中进行的,该干燥机可以使用重量为0至8g的样品。这些实验的优点是再现了在处理砂浆大气问题时可能发现的自然条件。干燥曲线的响应或干燥动力学取决于所施加的干燥条件。因此,空气温度从60℃变化到130℃,空气速度从2 m s -1变化到5 m s -1,相对湿度保持在1.7%以下。将实验结果与应用于有限形状的菲克定律所表示的扩散方程的解析解进行比较,可以确定扩散系数的值。它在60℃时的值为1.71×10 -10米2秒-1,在90℃时的值为13.69×10 -10米2秒-1,在130℃时的值为16.27×10 -10米2秒-1。还可以计算活化能和D0常数。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Determination of Moisture Diffusivity during Drying of Mortar Cement: Experimental and Modeling Study
The aim o f th is study is the experimental characterization of the behaviour o f a mo rtar during convective drying. We focalise on mortar that has a rate water-cement of 0.5. The drying tests are developed in a micro-convective dryer that can use samples weighing fro m 0 to 8g. The advantage of these experiments is to reproduce the natural conditions that can be found during the treatment of the mortar-at mosphere problems. The response of the drying curve or the drying kinetic depends on the applied drying conditions. So, the temperature of the air varies fro m 60℃ to 130℃, the velocity of the air is changed fro m 2 m.s -1 to 5 m. s -1 and the relative hu midity is kept less than 1.7%. The co mparison between the experimental results and the proposed analytical solutions of the equation of diffusion represented by Fick's law, applied for a finite shape, allo ws determination o f the values of the d iffusion coefficient. It has a value of 1.71×10 -10 m 2 .s -1 at 60℃, 13.69×10 -10 m 2 .s -1 at 90℃ and 16.27×10 -10 m 2 .s -1 at 130℃. Calculation of the activation energy and the D0 constant are also possible.
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