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pervious concrete
Pervious concrete (also called porous concrete, permeable concrete, no fines concrete and porous pavement) is a special type of concrete with a high porosity used for concrete flatwork applications that allows water from precipitation and other sources to pass directly through, thereby reducing the runoff from a site and allowing groundwater recharge.
Pervious concrete is made using large aggregates with little to no fine aggregates. The concrete paste then coats the aggregates and allows water to pass through the concrete slab. Pervious concrete is traditionally used in parking areas, areas with light traffic, residential streets, pedestrian walkways, and greenhouses.〔 Report No. 522R-10.〕〔(【引用サイトリンク】url=https://srmconcrete.com/ready-mix-concrete/pervious/ )〕 It is an important application for sustainable construction and is one of many low impact development techniques used by builders to protect water quality.
== History ==
Pervious concrete was first used in the 1800s in Europe as pavement surfacing and load bearing walls. Cost efficiency was the main motive due to a decreased amount of cement.〔 It became popular again in the 1920s for two storey homes in Scotland and England. It became increasingly viable in Europe after the Second World War due to the scarcity of cement. It did not become as popular in the US until the 1970s.〔
In India it became popular in 2000.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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