Asphalt concrete for very thin layers (BBTM) is used on roads as a Surface course with a thickness of 20 to 30mm. The product is a blend of a high proportion of single size coarse aggregate, fine aggregate, filler and polymer modified binder.
When combined the end product is a gap graded mixture that derives strength from the coarse aggregate skeleton that is filled with the mortar of fine aggregate, filler and polymer modified binder.