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首页> 外文会议>Cold regions engineering 2009 : Cold regions impact on research, design, and construction >Subgrade Temperature and Freezing Cycles in Pervious Pavements
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Subgrade Temperature and Freezing Cycles in Pervious Pavements

机译：透水路面的路基温度和冻结周期

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With the construction of four new test cells in 2008, the Minnesota Department of Transportation (Mn/DOT) now has six unique pervious pavement test sections at the MnROAD test facility. Recorded temperatures in the pervious pavements and subgrades were compared to impervious Portland Cement Concrete (PCC) test sections over the same time interval. It was found that the subgrade in pervious PCC and Hot Mix Asphalt (HMA) was up to 4 ℃ warmer in the winter than impervious PCC pavements. The frost depth in an impervious PCC pavement was found to be 45.7 cm deeper than in a pervious PCC pavement of similar thickness. One pervious pavement test cell experienced 60% less freezing cycles over a three year interval than impervious PCC pavements of similar thickness. The air trapped in the pavement voids was suspected to be the main reason for the reduced number of freeze-thaw cycles by creating an insulating effect. In another pervious pavement, entrapped air within the base material may also insulate the pavement from the subgrade.
机译：明尼苏达州交通运输部（Mn / DOT）于2008年建造了四个新的测试单元，现在MnROAD测试设施拥有六个独特的透水路面测试段。在相同的时间间隔内，将透水路面和路基的记录温度与不透水波特兰水泥混凝土（PCC）测试段进行比较。研究发现，透水的PCC和热混合沥青（HMA）的路基在冬季比不透水的PCC路面高4℃。发现不透水的PCC路面的霜冻深度比类似厚度的透水的PCC路面要深45.7厘米。一个透水的铺面测试室在三年的间隔内比相同厚度的不透水PCC铺面的冻结周期减少了60％。可以认为，困在路面空隙中的空气是通过产生绝缘作用而减少了冻融循环次数的主要原因。在另一个透水路面中，残留在基材中的空气也可能使路面与路基绝缘。

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