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首页> 外文会议>International Conference on Built Environment and Public Health(BEPH2004); 20041206-08; Shantou(CN) >On the Imprecision of the Water Absorption Coefficient Test on Aerated Autoclaved Concrete
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On the Imprecision of the Water Absorption Coefficient Test on Aerated Autoclaved Concrete

机译：加气蒸压混凝土吸水系数试验的不精确性。

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摘要

To avoid material damage and risk associated with mold growth or poor indoor air quality, one needs to understand and predict moisture transport through building materials. Water absorption coefficient, a measure of the cumulative rate of moisture inflow into a specimen under one-dimensional free-water intake process, is used in many heat, air and moisture transport models and standards. Generally, a limiting value is set for acceptance of materials to be used as sheathing membranes (weather-resistive barriers). It was observed, however, that precision of this test method varies significantly depending on the material or applied coating. A ruggedness test was performed to examine the relative importance of different factors affecting the test precision. Experimental evaluation of the water absorption coefficient was made up of two series, each comprised of seven evaluated factors such as specimen size, thickness, specimen surface condition, initial moisture content, and other elements of test procedure as well as mathematical model for data analysis. The selection of factors and the range of their variation was arbitrary and based entirely on the experience of researchers. Yet, with a sufficient number of comparative tests evenly split between the high and low end of the studied range of variation, one may establish relative significance to factors affecting the test method's precision. While the results will assist in improvement of the test method, one conclusion that stands out in this study is that when the two-parameter model is applied to evaluate the measured data , a much better fit is achieved than currently used one parameter model of water absorption.
机译：为了避免材料损坏和与霉菌生长或室内空气质量差相关的风险，需要了解和预测水分通过建筑材料的传输。在许多热，空气和湿气传输模型和标准中都使用了吸水系数，它是在一维自由水进水过程中水分流入样品的累积速率的度量。通常，为接受用作护套膜的材料（耐气候屏障）设置极限值。然而，据观察，该测试方法的精度根据材料或所施加的涂层而显着变化。进行了耐用性测试，以检查影响测试精度的不同因素的相对重要性。吸水系数的实验评估由两个系列组成，每个系列包括七个评估因素，例如试样尺寸，厚度，试样表面状况，初始含水量和测试程序的其他要素以及用于数据分析的数学模型。因素的选择及其变化范围是任意的，并且完全基于研究人员的经验。然而，通过足够数量的比较测试，在研究变化范围的上限和下限之间平均分配，可以确定影响测试方法精度的因素的相对重要性。虽然结果将有助于改进测试方法，但这项研究中突出的一个结论是，当使用二参数模型评估测量数据时，与当前使用的水的一个参数模型相比，拟合效果更好。吸收。

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