M48 Severn Crossing Bridge Resurfacing - Expression of Interest

This is an expression of interest for planned resurfacing works on the M48 Severn Crossing. The project involves applying mastic asphalt surfacing using Permatrack Bridge Surfacing with 40% 4/10mm aggregate (MA 10 10/20) and 6mm pre-coated chippings (68PSV) at a spread rate of 6.0 to 7.5 kg/m². The finished surface must achieve a mean thickness of 35mm ± 2mm. Quality standards include: surface regularity measured on 75m lengths using a 3m straight-edge with maximum 3mm deviation (maximum 9 irregularities at 4mm and 1 at 7mm per 75m section); initial texture depth of 1.5mm to 2.0mm average per 1,000m or lane length (minimum 1.2mm for individual measurements); and macrotexture measured using the volumetric patch method per BS EN 13036-1 at 10 measurements per 200m. All specifications and values are estimates for budgeting purposes.