Performance Advantages of Permeable Concrete Pavements

1. Ecological and Environmental Benefits of Permeable Pavements

　　Pervious concrete pavement is a type of surface paving whose internal structure consists of a skeletal framework of interconnected pores that communicate with the external atmosphere, while simultaneously meeting the strength and durability requirements for road and paving applications. Pervious pavements include pervious asphalt pavement, pervious concrete pavement, and pervious pavers; moreover, the traditional pebble paving used in landscape design in China also qualifies as a form of pervious pavement. Some pervious pavers are integrated with vegetation to create semi-greened surfaces. Due to their inherent environmental benefits, pervious pavements are receiving increasing attention.

2. Maintaining the balance of the urban soil ecological environment

　　Permeable paving combines excellent water infiltration and moisture-retention properties. It not only meets the functional demands of human activities on impervious surfaces but also, through its inherent characteristics, approximates the ecological benefits of natural turf and soil surfaces, thereby mitigating the environmental damage caused by urban non-permeable pavements. Moreover, the living spaces for flora, fauna, and microorganisms beneath permeable pavement are effectively protected, thus fully embodying the sustainable development principle of “coexistence with the environment.”

3. Excellent flood-control and drainage performance

　　Owing to its excellent permeability and infiltration capacity, such pavement can effectively alleviate flood-discharge pressure on urban drainage systems, resulting in a gentle runoff hydrograph with lower peak flows and a gradual rise and fall of flow rates—features that are undoubtedly advantageous for urban flood control. Therefore, the use of permeable pavements is a proactive measure for flood prevention in urban plazas.

4. The role of improving the lighting environment

　　The porous surface of permeable pavement causes diffused reflection of incident light, thereby eliminating the glare caused by specular reflection that often occurs on smooth tiles or stone surfaces. On rainy days, water pooling on impervious pavements also generates glare, which is particularly severe under the illumination of vehicle headlights at night—this is one of the major contributing factors to the high incidence of traffic accidents during nighttime rain. By promptly dissipating surface water, permeable pavement overcomes the drawbacks associated with impervious surfaces, such as hydroplaning, water spray, and nighttime glare, thus enhancing urban traffic safety.

5. Has sound-absorbing properties

　　When sound waves strike the surface of a permeable pavement, they induce air motion within the pavement’s pores and voids. Near the pore walls, the air velocity is relatively low; due to friction and viscous drag, a portion of the acoustic energy is converted into heat, thereby attenuating the sound wave. In addition, heat loss resulting from thermal exchange between the air in the pores and the pore walls further reduces the acoustic energy. With the increasing number of high-rise buildings and elevated roadways in urban areas, coupled with aircraft noise passing over city centers, these high-intensity sound sources project downward onto permeable pavements. Based on the principles outlined above, permeable pavements, through their unique sound-absorbing and noise-reducing mechanisms, significantly improve the urban acoustic environment. By contrast, conventional impervious, hardened plaza surfaces merely reflect sound waves back into the environment, offering no sound absorption or noise reduction. Moreover, the porous structure of permeable pavements can reduce tire noise generated by vehicles traveling over them, which in turn helps to lower overall traffic noise. The pore structure of pervious concrete can effectively reduce pavement noise by 6 to 10 decibels.

6. Environmental protection and urban environmental optimization

　　Porous, permeable engineering materials can adsorb urban pollutants such as dust, thereby reducing dust pollution and filtering surface runoff. Moreover, on rainy days they effectively prevent the formation of surface runoff, which in turn prevents litter from being carried away by runoff and eliminates the problem of dirty water spreading everywhere. As a result, cities remain clean and tidy in both sunny and rainy weather, making them more environmentally friendly.