Pervious concrete

Pervious concrete is a mixture of coarse aggregate, Portland cement, water and little to no sand.

A typical pervious concrete pavement has a 15-25% void structure and allows 125 to 325 litres of water per minute to pass through each square metre.

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Pervious concrete for road pavements

Pervious Concrete can be successfully used for pavements and is environmentally friendly paving material that offers the durability of standard concrete while retaining storm water runoff and replenishing local watershed systems

By using pervious concrete drainage of run off water at parking lots, sidewalks, streets, driveways, etc. can be done.

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Where it is used?

pervious concrete is helping communities in California and Washington restore groundwater supplies and reduce pollution of coastal waters, which can endanger fragile aquatic ecosystems and even swimmers.

In California, pervious concrete is primarily being used to pave parking lots. But its also becoming a practical alternative for subdivision streets, sidewalks, and golf cart paths.

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Installation process of Pervious Concrete

Pervious concrete is delivered to the jobsite by conventional ready-mix trucks.

Because pervious concrete is thicker in consistency than regular concrete, a vibrating mechanical screed is used to level it off. Vibration is followed by compaction with a heavy steel roller to attain greater strength.

Because pervious concrete has a low water content, curing is especially critical. After placement, the concrete is mixed with water and then covered with plastic sheeting and kept damp for at least 7 days to allow full hydration of the cement.

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Benefits of Pervious Concrete

Economic Benefits Environmental Benefits Other Benefits

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Economic Benefits

initial costs for pervious concrete pavements are higher than those for conventional concrete or asphalt paving. But total costs can be substantially lower.

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Environmental Benefits

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Other Benefits

Lower installation costs Permits the use of existing sewer systems Increased land utilization Lower life-cycle costs

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Limitations

As pervious concrete contain no fine aggregate its surface is quiet rough and honeycombed. Hence it seems unsuitable for roads where traffic is heavy as on highways.

It can not used for highways, because it has low strength

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Further Scope

There is much more scope for research work to impart sufficient smoothness to pervious concrete pavement surface. Grinding of surface or providing porous plaster may be tried.

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