Pavement Design

Pervious and impervious pavements have different design parameters. It's vital to get this right!!

Pavements have three key purposes. First and foremost, they need to support loads without excessive cracking or deforming Secondly, they need to provide a smooth surface for  vehicles or pedestrians to improve comfort and efficiency. Thirdly, they need to eliminate drainage problems such as mud and ponding.

Pavements typically consist of a number of layers, placed  over the in-situ material, which work together to withstand traffic and environmental conditions. The surface layer may be made of concrete, asphalt,  aggregate, geocells, grids, or blocks. Paving materials may also be porous or nonporous.

Porous (or permeable) materials have open voids between their particles or units that allow the movement of water and air around the paving material. Porous paving helps to grow healthy urban trees, through the admission of vital air and water to their rooting zones.

Porous pavements behave almost like a natural soil  surface, enabling the soil moisture to fluctuate with rapid wetting followed by drying and re-aeration. Other  advantages of porous paving include better management of urban runoff, resulting in less erosion and siltation and greater control of pollutants, particularly heavy metals and oil, through capture and breakdown in the subgrade.


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