- Rugby Black Bitumen Macadam Tarmac For Repairing Patches and Refurbishing Concrete Rugby® Black Bitumen Macadam is a cold lay deferred-set compound carefully formulated for ease of use and to give good results every time when repairing patches or refurbishing concrete. Each 25kg bag of Rugby® Black Bitumen Macadam will cover approximately 0.45m2 at a final compacted thickness of up to 25mm