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The temperature variation of the water sorptivity of construction materials

机译：建筑材料吸水率的温度变化

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The sorptivity is used widely to characterise water dynamics in construction materials. Yet its variation with temperature has been little investigated. We report the results of a collaborative study between two laboratories in which the temperature dependence of the sorptivity of ten materials has been measured in part or all of the range 5-45 degrees C. The materials cover a wide range of compositions and of numerical sorptivity values. We find that the sorptivity is about 50% greater at 45 degrees C than at 5 degrees C, and that, with one exception, the temperature coefficient is similar in all the materials studied. This shows that for practical purposes the value of the sorptivity of an individual material at any temperature in this range may be estimated from a single measured value. The observed variation with temperature is attributed to the changes in the viscosity and surface tension of water, and is as predicted by a simple classical scaling of capillary dynamics, assuming that neither the wetting index nor the capillary moisture content vary with temperature. One of the materials studied, Lympia chalk, shows a somewhat smaller temperature variation than predicted by this scaling. We comment that commonly-used standards do not recognise adequately that the sorptivity varies with temperature.
机译：吸着率被广泛用于表征建筑材料中的水动力学。然而，其随温度变化的研究很少。我们报告了两个实验室之间合作研究的结果，其中已在5-45摄氏度的部分或全部范围内测量了十种材料的吸着性的温度依赖性。这些材料涵盖了广泛的成分和数值吸着性价值观。我们发现，在45摄氏度下的吸着率比在5摄氏度下的吸着率高约50％，除了一个例外，在所有研究的材料中温度系数都相似。这表明，出于实际目的，可以根据单个测量值估算单个材料在该范围内任何温度下的吸着率值。所观察到的随温度的变化归因于水的粘度和表面张力的变化，这是通过简单经典的毛细管动力学定标预测的，假设润湿指数和毛细管水分含量都不随温度变化。研究的一种材料，Lympia粉笔，显示出的温度变化比这种缩放所预测的要小。我们评论说，常用的标准不能充分认识到吸附度随温度而变化。

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