M48 SEVERN CROSSING RESURFACING EXPRESSION OF INTEREST

Scope as published

• Application of the following mastic asphalt product: Permatrack Bridge Surfacing + 40% 4/10mm Agg (MA 10 10/20) with 6mm Pre-coated chippings 68PSV at a rate of spread of 6.0 to 7.5 kg/m2 • Application to achieve a mean thickness of an average of 35mm +/- 2mm locally • Surfacing to achieve the following standard: o Surface regularity taken on 75m lengths, the pavement surface shall be measured transversely for irregularities at 10m intervals by a 3m long straight-edge in accordance with BS8420 placed at right angles to the centre line of the road. The maximum allowable difference between the surface and the underside of the straight-edge, when placed parallel with, or at right angles to, the centre line of the road shall be 3mm. For each 75m lengths, maximum permitted number of surface irregularities shall be 9 and 1 for irregularity limits of 4mm and 7mm respectively. o Initial texture depth: 1.5mm (minimum) to 2.0mm (maximum) for average per 1,000m or complete carriageway lane where this is less than 1,000m. Initial texture depth: Average for a set of 10mm measurement shall be 1.2mm minimum. Interval and frequency of macrotexture measurements: 10 per 200m. Texture depth shall be measured by 10 individual measurements taken at approximately 5 m spacing along a diagonal line across the lane width. Initial surface macrotexture for bituminous surface courses shall be measured using the volumetric patch method described in BS EN 13036-1. Additional information: This is an expression of interest for planned works. All values expressed are estimated for budget purposes.

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