Standard specification for road works 2015/2016
Standard specification for road works; Reports; PublicationNT
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miscellaneous provisions ■ provision for traffic ■ clearing grubbing and rehabilitation ■ earthworks ■ conformance testing ■ pavements and shoulders ■ stabilisation ■ spray sealing ■ dense graded asphalt ■ slurry surfacing ■ miscellaneous concrete works ■ drainage works ■ protection works ■ road furniture and traffic control devices ■ pavement marking ■ landscape ■ ducting and conduits ■ traffic control signals ■ traffic counting stations ■ street lighting ■ directional (thrust) boring ■ measurement and payment ■ referenced documents ■ nt climate zones table ■ This document specifies the general standards of materials and workmanship required by the Department of Infrastructure for construction of civil road network assets
Roads -- Northern Territory -- Works -- Periodicals.
Department of Infrastructure
DENSE GRADED ASPHALT STANDARD SPECIFICATION ROADWORKS DoI REFERENCE TEXT December 2015 Page 72 Cease laying asphalt during heavy or continuous rain, or in wet conditions where the material will not adhere or key to the surface. Remove from site all excess or spilt asphalt. 9.10.2 Mechanical Spreading Provide a self-propelled paving machine having an effective capacity of not less than 250 tonnes per eight hour day. Paving machines must be equipped and operated with automatic joint matching facility. Refer to PROJECT SPECIFIC REQUIREMENTS in the RFT for information about when other spreaders may be used. 9.10.3 Hand Spreading Hand spread only in locations where mechanical spreading is not possible, and to correct localised depressions or irregularities. 9.10.4 Laying Pattern Witness Point Complete the work as one continuous operation where practicable. Witness Point - Supply construction program plans 7 working days prior to commencement of works. Confirm paving plan prior to the commencement of each shift. 9.10.5 Trial Areas Required on projects greater than 1000m2 in treated area or where specified in the PROJECT SPECIFIC REQUIREMENTS section of the RFT: Construct a trial area for each type of mix. - Dimensions: 3.5 m wide and 30 m long. - Use the trial to determine the type and number of rollers and the rolling pattern to be used. - Take compaction cores and continue the trials until compliance requirements are met. - Maintain the process established by the trial. 9.10.6 Joints Generally Minimise the number of longitudinal and transverse joints. Do not leave longitudinal joints on a pavement in use by traffic. Joints are not to be placed in wheel paths. Joints are not to be placed at Intersections where practicable. Offset the joints in multiple layer work by at least 100 mm so that joints in the surface course do not overlay joints in the previous course. Overlap the finished asphalt by 25 mm to 75 mm when spreading. Push the overlap asphalt back immediately to form a ridge along the joint. Roll the ridge to form a smooth level joint. Remove excess asphalt prior to final rolling. Prevent the accumulation of coarse particles along the joint by raking. 9.10.7 Traverse Joints Form transverse joints by cutting the end of the spread material to a vertical face and remove loose material. Ensure transverse joints are level using a 3 metre straight edge and cut back to the true level surface with no deviation. Minimum of 200 mm or to match cross fall. Check the surface adjacent to the joint with a straight edge and correct any surface defects immediately. Treat the face of the joint with bitumen emulsion tack coat prior to spreading adjacent section. Transverse Match of Overlay to Existing Pavement: - Saw cut existing asphalt pavement 20 mm depth along the match line of joint. - Remove taper wedge of existing asphalt pavement along the overlay side of match joint. - Feather the asphalt overlay down to the existing pavement to achieve a maximum slope of 1 in 10 and for the full width of the pavement. - Ensure depth of overlay above existing pavement in taper wedge area is not less than 20 mm. 9.10.8 Longitudinal Joints Keep longitudinal joints straight or follow the line of curvature. Minimise the unsupported length left overnight. Rectify broken sections of unsupported edge by cutting a vertical face before resuming laying. Treat the face of the joint with bitumen emulsion tack coat prior to spreading adjacent section. 9.10.9 Temporary Ramps Provide ramps of compacted asphalt with a maximum grade of 1% relative to pavement grade, where transverse joints are left overnight on trafficked pavements. Longitudinal Ramps are to be a minimum of 300 mm when under traffic control. No temporary longitudinal ramps are to be left unattended. 9.11 COMPACTION 9.11.1 Compaction Generally Compact by the method established during the construction of the trial area or as approved by the Superintendent. Compact by using adequate pneumatic tyred and tandem steel wheeled rollers to achieve the specified compaction.