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首页> 美国卫生研究院文献>Materials >Optimizing a Test Method to Evaluate Resistance of Pervious Concrete to Cycles of Freezing and Thawing in the Presence of Different Deicing Salts
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Optimizing a Test Method to Evaluate Resistance of Pervious Concrete to Cycles of Freezing and Thawing in the Presence of Different Deicing Salts

机译：优化测试方法以评估在不同除冰盐存在下透水性混凝土的抗冻融性

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摘要

The lack of a standard test method for evaluating the resistance of pervious concrete to cycles of freezing and thawing in the presence of deicing salts is the motive behind this study. Different sample size and geometry, cycle duration, and level of submersion in brine solutions were investigated to achieve an optimized test method. The optimized test method was able to produce different levels of damage when different types of deicing salts were used. The optimized duration of one cycle was found to be 24 h with twelve hours of freezing at −18 °C and twelve hours of thawing at +21 °C, with the bottom 10 mm of the sample submerged in the brine solution. Cylinder samples with a diameter of 100 mm and height of 150 mm were used and found to produce similar results to 150 mm-cubes. Based on the obtained results a mass loss of 3%–5% is proposed as a failure criterion of cylindrical samples. For the materials and within the cycles of freezing/thawing investigated here, the deicers that caused the most damage were NaCl, CaCl2 and urea, followed by MgCl2, potassium acetate, sodium acetate and calcium-magnesium acetate. More testing is needed to validate the effects of different deicers under long term exposures and different temperature ranges.
机译：缺乏标准的测试方法来评估透水性混凝土在有除冰盐存在下的冻融循环的抵抗力是本研究的动机。研究了不同的样品大小和几何形状，循环持续时间以及在盐水溶液中的浸没水平，以实现优化的测试方法。当使用不同类型的除冰盐时，优化的测试方法能够产生不同程度的损坏。发现一个周期的最佳持续时间为24小时，在-18°C下冷冻12小时，在+21°C上解冻12小时，样品的底部10毫米浸没在盐水溶液中。使用直径为100毫米，高度为150毫米的圆柱样品，发现其产生的结果与150毫米立方体相似。根据获得的结果，提出3％-5％的质量损失作为圆柱样品的破坏准则。对于此处研究的材料和冷冻/融化循环而言，造成最大破坏的除冰剂是NaCl，CaCl2和尿素，其次是Mg​​Cl2，乙酸钾，乙酸钠和乙酸钙镁。需要更多的测试来验证不同除冰剂在长期暴露和不同温度范围下的效果。

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