Permeable interlocking concrete pavement (PICP) systems have enlarged spacer bars that create surface openings that are filled with highly permeable filter aggregate. Typically, PICP has between 5–15 percent surface openings that are often between ¼ inch and ½ inch wide and are always filled with opengraded washed angular aggregate stone.
CE Center Permeable Interlocking Concrete Pavement ...
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