Regular concrete consists of aggregate + cement + water + sand, but pervious concrete omits the sand, leaving an interconnected void network that water can pass directly through. This reduces flooding, aids in groundwater recharge, reduces runoff pollution, reduces noise pollution, and qualifies buildings for LEED certification.
Image courtesy of https://www.archiproducts.com/en/products/betonrossi/pervious-concrete-for-road-pavings-drainbeton_69845
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