This paper investigated the potential of using high-conductivity permeable concrete pavement in alleviating urban heat island (UHI) effect in both dry and wet conditions. The high-conductivity permeable concrete was prepared by adding steel fibers into traditional permeable concrete. Laboratory tests were conducted to backcalculate thermal conductivity of permeable concrete using the measured temperature files and thermal transfer models. The indoor experiments with controlled thermal radiation and water spray were conducted to measure surface temperatures of permeable concrete slabs in dry and wet conditions. Finite element models were developed to simulate thermal behavior of permeable concrete pavement and the simulation model results were found in good agreement with the indoor temperature measurements. The results showed that the permeable concrete slabs have the higher surface temperature than conventional concrete slab in dry conditions, but similar or lower surface temperatures in the wet condition, depending on water evaporation rate. The peak surface temperature of high-conductivity permeable concrete was 1–3 °C lower than that of conventional permeable concrete due to high thermal condition. The simulation results of outdoor environment show that permeable concrete pavement caused slightly greater heat output on sunny days but much smaller heat output on rainy days to the near-surface environment, as compared to conventional concrete pavement. The increase of thermal conductivity of permeable pavement can further reduce the heat output by 2.5–5.2%. The study findings prove that the high-conductivity permeable concrete is an effective method to alleviate UHI effect in dry and wet conditions.

中文翻译：

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高导透水混凝土路面缓解城市热岛效应


本文研究了使用高导透水混凝土路面在干燥和潮湿条件下缓解城市热岛效应的潜力。在传统透水混凝土中添加钢纤维制备高导透水混凝土。进行实验室测试，利用测量的温度文件和热传递模型反算透水混凝土的导热系数。通过受控热辐射和喷水的室内实验测量了透水混凝土板在干燥和潮湿条件下的表面温度。开发了有限元模型来模拟透水混凝土路面的热行为，模拟模型结果与室内温度测量结果非常吻合。结果表明，在干燥条件下，透水混凝土板比传统混凝土板具有更高的表面温度，但在潮湿条件下，其表面温度相似或更低，具体取决于水蒸发率。由于高温条件，高导透水混凝土的表面峰值温度比常规透水混凝土低1-3℃。室外环境模拟结果表明，与传统混凝土路面相比，透水混凝土路面对近地表环境的晴天产热量略大，雨天产热量小得多。透水路面导热系数的增加可进一步降低发热量2.5%~5.2%。研究结果证明，高导透水混凝土是缓解干湿条件下城市热岛效应的有效方法。