Coated Macadam/Asphalt Roads/Pavings

Q22 COATED MACADAM/ASPHALT ROADS/PAVINGS

SPECIFICATION FOR

COATED MACADAM/ASPHALT ROADS/PAVINGS

SECTION Q22

Revision Date Issue Authorised By

Approved for Issue Date

Author HE BETTWS SCHOOL, NEWPORT SS00940

09/07 Rev clarkebond Page 1 of 4 Q22 COATED MACADAM/ASPHALT ROADS/PAVINGS

To be read with Preliminaries/ General conditions.

TYPES OF PAVING

110 COATED MACADAM PAVING FOR INTERNAL ROADS AND SERVICE AREAS Standard: Highways Agency “Specification for Highway Works” Subgrade improvement layer: as Section Q20 - Compacted thickness: refer to CBR value Granular sub-base: as Section Q20 - Compacted thickness: refer to CBR value Base: Dense Macadam, 28mm aggregate size, 100 pen bitumen - Compacted thickness: 70mm Binder course: Dense Macadam, 20mm aggregate size, 100pen bitumen - Compacted thickness: 50mm Surface course: Close Graded Macadam,10mm aggregate size. - Compacted thickness: 40mm Surface treatment: n/a Other requirements: n/a

115 COATED MACADAM PAVING FOR PARKING AREAS Standard: Highways Agency “Specification for Highway Works” Subgrade improvement layer: as Section Q20 Granular sub-base: as Section Q20 Compacted thickness refer to CBR value Binder course: Dense Macadam, 28mm aggregate size, 100pen bitumen. - Compacted thickness: 50mm Surface course: Close Graded Macadam, 10mm aggregate size. - Compacted thickness: 40mm Surface treatment: n/a Other requirements: n/a

PREPARATORY WORK/ REQUIREMENTS

220 BITUMINOUS MATERIALS GENERALLY Suppliers’ names: Submit for approval - Timing (minimum): 2 weeks before starting work. Test certificates: At the time of delivery for each manufacturing batch submit certificate: - Confirming compliance with this specification and the relevant British Standard. - Stating full details of composition of mix.

240 ACCEPTANCE OF SUB-BASE Surface: Sound, clean and suitably close textured. Levels and falls: To be within the specified tolerances: - Vehicular areas: +10 to -30mm. - Pedestrian areas 12mm. - Drainage outlets: 0 to -10mm of the required finished level. Kerbs and edgings: Complete, adequately bedded and haunched and to the required levels.

250 ABUTMENTS Vertical edges of manholes, gullies, kerbs and other abutments: Clean and paint with a thin uniform coating of polymer jointing compound.

LAYING

310 LAYING GENERALLY Preparation: Remove all loose material, rubbish and standing water. Adjacent work: Form neat junctions. Do not damage. Channels, kerbs, inspection covers etc.: Keep clean. New paving: - Keep traffic free until it has cooled to prevailing atmospheric temperature. - Do not allow rollers to stand at any time. - Prevent damage. - Lines and levels: With regular falls to prevent ponding. - Overall texture: Smooth, even and free from dragging, tearing or segregation. - State on completion: Clean.

315 B MACHINE LAYING Unless noted otherwise machine laying is to be used for all work.

320 A ADVERSE WEATHER Frozen materials: Do not use. Suspend laying: - During freezing conditions. - If the air temperature reaches 0ºC, or in calm dry conditions -1ºC on a falling thermometer. - Hot rolled asphalt: During periods of continuous or heavy rain or if there is standing water on the base.

330 LEVELS Permissible deviation from the required levels, falls and cambers (maximum): - Finished surface: 6mm. - Adjacent to gullies and manholes: 0 to + 3mm.

340 FLATNESS/ SURFACE REGULARITY Deviation of surface: Where appropriate in relation to the geometry of the surface, the variation in gap under a 3m straightedge placed anywhere on the surface to be not more than: - Base: 25mm - Binder course: 13mm - Surface course: 7mm - Where a straightedge cannot be used the surface must be of a comparable standard of accuracy when judged by eye.

351 CONTRACTOR'S USE OF PAVEMENTS Preparation for final surfacing: - Timing: Defer laying until as late as practicable. - Immediately before laying final surfacing: Clean and make good the base/ binder course. Allow to dry, uniformly apply, without puddles a tack coat of sprayed bitumen emulsion of a suitable grade to BS 434-1 at 1.5 to 2.0 kg/sqm. Accuracy: Uniform, without puddles. - Finishing: Allow emulsion to break completely before applying surface.

09/07 Rev clarkebond Page 4 of 4