2024 Volume 28 Issue 1 Pages 45-52
In urban areas with a high degree of concrete urbanization, the urban heat island (UHI) effect has become an environmentally significant concern. Among UHI factors, the materials that cover the ground surface significantly affect temperature variation in urbanized areas. Several solutions have been implemented for mitigating the increase in ground surface temperatures, including the use of materials with self-cooling capabilities such as water-permeable (pervious) interlocking blocks, asphalt and concrete. In particular, surfacing with the pavements using water-permeable interlocking blocks and concrete supplemented with water-retaining materials has been employed to enhance the effective reduction of ground surface temperatures under hot summer climate conditions. The objective of this study is to evaluate the thermal performance of water-permeable surface pavers in car parking lots in Hanoi, Vietnam. Various water-permeable pavement structures were applied in the test areas for on-site testing. Pervious concrete (PC), which included recycled materials from construction waste, natural aggregates and fine lightweight aggregate from autoclaved aerated concrete (AAC), was utilized with variations in ground surface temperature monitored. Additionally, ground surfaces using both asphalt concrete and conventional concrete were tested for comparison. During the on-site monitoring conducted in the summer, all water-permeable pavements contributed to surface temperature reductions of over 5°C. Remarkably, the surface temperature of water-retaining PC using AAC was more than 10°C lower when the surface temperature of asphalt concrete reached nearly 60°C. This paper also reports results on the mechanical properties and permeability coefficients of water-permeable pavements.
