Layered architectural pervious concrete

Abstract

A layered architectural water pervious concrete is provided. The concrete assembly includes a first layer of water pervious concrete preferably having 15%-25% void space capable of channeling water to the ground and underlying water table. Poured upon the pervious concrete layer, is a non-pervious concrete layer. Joints are formed through the non-pervious concrete layer, which preferably penetrates into the pervious concrete layer at least ¼ inch. Water flows from the top surface of the concrete assembly through the joints and into the porous concrete layer for distribution to the ground below.

1 . A method of producing a layered architectural pervious concrete, the method comprising the steps of:
 (a) preparing a subgrade or framework for concrete placement;   (b) pouring a pervious concrete mixture upon the subgrade or within the framework to form a layer of pervious concrete and create a pervious concrete surface;   (c) pouring an impervious concrete mixture upon the pervious concrete surface to form a layer of impervious concrete and create an exposed impervious concrete surface; and   (d) forming one or more joints into to the layer of impervious concrete with the joints extending at least from the exposed impervious concrete surface to the pervious concrete surface.   
     
     
         2 . The method of producing a layered architectural pervious concrete of  claim 1  wherein the pouring an impervious concrete mixture upon the pervious concrete surface is conducted while the impervious layer of concrete is still in a plastic state. 
     
     
         3 . The method of producing a layered architectural pervious concrete of  claim 1  wherein the joints extend at least ¼ inch into the layer of pervious concrete. 
     
     
         4 . The method of producing a layered architectural pervious concrete of  claim 2  wherein the joints extend into the layer of pervious concrete but not all the way through the layer of pervious concrete. 
     
     
         5 . The method of producing a layered architectural pervious concrete of  claim 2  wherein the step of forming joints includes sawing through the layer of impervious concrete. 
     
     
         6 . The method of producing a layered architectural pervious concrete of  claim 1  wherein the step of forming joints includes pre-molding joints through the layer of impervious concrete. 
     
     
         7 . The method of producing a layered architectural pervious concrete of  claim 1  wherein the pervious concrete has at least 5% voids. 
     
     
         8 . The method of producing a layered architectural pervious concrete of  claim 2  wherein the pervious concrete has at 10-30% voids. 
     
     
         9 . The method of producing a layered architectural pervious concrete of  claim 1  wherein the pervious concrete provides a water flow rate of at least 2 gallons per minute per square foot. 
     
     
         10 . The method of producing a layered architectural pervious concrete of  claim 2  further comprising the steps of:
 (a) broadcasting a decorative aggregate upon the exposed impervious concrete surface; 
 (b) troweling the decorative aggregate into the exposed impervious concrete surface; and 
 (c) exposing the decorative aggregate within the exposed impervious concrete surface. 
 
     
     
         11 . A layered architectural pervious concrete comprising:
 (a) a subgrade or framework for concrete placement;   (b) a layer of pervious concrete upon the subgrade or within the framework having a pervious concrete upper surface;   (c) a layer of impervious concrete upon the pervious concrete surface having an exposed impervious concrete surface; and   (d) one or more joints formed into to the layer of impervious concrete with said joints extending at least from said exposed impervious concrete surface to said pervious concrete surface.   
     
     
         12 . A layered architectural pervious concrete of  claim 11  wherein the one or more joints extend at least ¼ inch into the layer of pervious concrete. 
     
     
         13 . A layered architectural pervious concrete of  claim 11  wherein the joints extend at least 1 inch into the layer of pervious concrete. 
     
     
         14 . A layered architectural pervious concrete of  claim 11  wherein the pervious concrete has at least 5% voids. 
     
     
         15 . A layered architectural pervious concrete of  claim 11  wherein the pervious concrete has at least 15%-25% voids. 
     
     
         16 . A layered architectural pervious concrete of  claim 11  wherein the pervious concrete provides a water flow rate of at least 2 gallons per minute per square foot. 
     
     
         17 . A layered architectural pervious concrete of  claim 11  further comprising a surface seeded exposed aggregate formed into said exposed impervious concrete surface.