Capillary Concrete!

Today we did our first pour of Capillary Concrete Bunker liner.  This product is basically a small "pea gravel" type stone, covered in a concrete mixture that allows it to dry hard like concrete.  Once dry, the material has porous holes for the water to flow through and drain quickly.  Take a look at the pictures to see the steps as to how it is installed.

The Capillary Concrete comes mixed in a concrete truck.  The crew will load the mixture into a trailer and haul to the edge of the bunkers.

In the middle of the photo is a large pile of Capillary Concrete.  These guys are working to spread it evenly across the bottom of the bunker at a depth of 3 inches thick.  They use a gauge to tell them where to add or remove to ensure an even distribution.  The darker color gravel in the picture is the drain line for the bunker.

Here you can see the trailer dumping another load of Capillary Concrete.  

A standard concrete trowel is used to smooth out the surface to make a nice bottom for the bunkers

Last but not least, a wet paint roller is used to seal the gravel together and to compact the Capillary Concrete.  This helps all the gravel particles stay together and helps it become homogeneous and consistent once dry.