Mechanical Concrete ® Filling TIRE-DERIVED-CYLINDERS, TDC with Stone 

The final step in placing Mechanical Concrete ® is filling the TDC with graded crushed stone material. The material specified is usually AASHTO #57 or AASHTO #3 for auto TDC. These stone particle gradations are specified since they are composed of stone particles of approximately the same size. This allows the stone to flow into the cylinder filling it completely without the need for compaction. It also maintains the void ratio necessary to allow water to freely drain through the material.
For more information visit www.mechanicalc...