Pervious concrete may also be called permeable concrete, porous concrete, no-fines concrete or gap graded concrete. Carefully controlled amounts of water, cement, fly ash and admixtures combine to form a thick paste around the aggregate particles while eliminating all, or most of, the sand, creating a substantial void content. Typically, 15% to 25% voids are achieved, allowing a high flow rate of water through the concrete.
The most common use for pervious concrete is in pavement in parking lots for use of storm water runoff management. By capturing water and allowing it to seep into the ground, pervious concrete recharges ground water, reduces runoff, and meets U.S. Environmental Protection Agency storm water regulations. This pavement technology creates more efficient land use by eliminating the need for retention ponds, swales, and other water management devices.
See how Pervious Concrete is used with an Allan Block Retaining Wall
Allan Block has engineered segmental retaining wall projects using pervious concrete as a drainable fill behind the retaining wall. The pervious concrete attaches to the back of the block extending the depth of the wall mass allowing for less excavation than typical geo-grid walls. The details are available in the Case Study, Web link, and Installation Manual located on the page.
Please look at the information available on the Allan Block website: Web Site Information
as well as the Case Study pdf.
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