Showing papers on "Pervious concrete published in 1973"

Water reservoir liner for concrete forms

Abstract: A liner for concrete forms comprises a self-skinning, flexible foam of elastomeric material formed into sheets for lining a concrete form. The liner includes at least one dense but permeable concrete contacting face or skin leaving its configuration in the set concrete, and an open cell foam core which takes up water and air passing through the contacting skin into the foam from the surface of freshly poured concrete, particularly on vibration of the concrete. Water and air separate in the foam core with the air passing upwardly and out of the core, leaving a reservoir of water in the open cells of the core, thereby maintaining a wet surface on the contacting face of the concrete, and which water migrates back into the concrete as it cures, taking up water.