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
SPRAY SEALING STANDARD SPECIFICATION ROADWORKS DoI REFERENCE TEXT December 2015 Page 63 8.12.7 Hand Spraying Plan work to minimise the requirement for the use of a hand sprayer. Any strips of pavement not adequately covered with sprayed material to be sprayed later with the hand attachment. 8.13 APPLICATION OF GEOFABRIC HOLD POINT Hold Point - Submit details of proposed machinery and method of application. Overlap longitudinal and transverse joints 150 mm minimum. Place longitudinal joints in the fabric along lane boundaries within 100 mm of lane marker. Trim the fabric as required to achieve this. Bond the fabric to the pavement with a tack coat sprayed 100 mm wider than the fabric and in accordance with the Superintendents directions for location. Use Standard Bitumen class C320 for the tack coat. Place the fabric under tension when laying, using suitable machinery, ensuring that folds or creases do not occur. Use equipment to place fabric that does not cause undue migration of the underlying tack coat into the fabric. Upon completion of placing of fabric and prior to application of the second/top binder coat, roll the fabric with minimum 4 passes of a pneumatic multi-wheel roller. Carry out rolling of the geofabric at a constant roller velocity with no acceleration or deceleration. Use Standard Class C320 binder for the second / top binder coats. 8.14 APPLICATION OF AGGREGATE HOLD POINT Load aggregate into appropriate aggregate spreading trucks using an approved loader which does not contaminate the aggregate with dust, dirt and oversize stone while applying precoat. Hold Point Obtain approval from the Superintendent for use of the proposed aggregate loader before commencing loading operations.. Apply aggregate to sprayed binder within: - 10 minutes where the pavement temperature is 20 C or greater. - 5 minutes where the pavement temperature is between 15 and 20 C . Polymer Modified Binders: Apply aggregate within 5 minutes irrespective of pavement temperature. Apply aggregate to emulsion coat before the emulsion breaks. Use cut off plates on spreader boxes to ensure that the correct widths are covered in aggregate, without overlap. In trafficked areas, apply both coats of a two coat seal on the same day. Where not trafficked apply the second coat on the following day. 8.14.1 Aggregate Spread Rates Spread the aggregate evenly and uniformly over the sprayed surface at a rate complying with Table 8.5 Aggregate Spread Rates. Use a mechanical spreader, manual spreader boxes are not to be used. Rerun or hand cover bare or insufficiently covered areas after the first spreading. Remove all excess aggregate. Table 8.5 Aggregate Spread Rates Straight Run Binder Coats Aggregate Size Traffic Volume Application Rate 10 mm and greater >200 vehicles/day 900/ALD m2/m3 10 mm and greater < 200 vehicles/day 850/ALD m2/m3 7 mm and less 900/ALD m2/m3 Polymer Modified Binder Coats Aggregate Size Traffic Volume Application Rate 10 mm and greater >300 vehicles/day 750/ALD m2/m3 10 mm and greater < 300 vehicles/day 800/ALD m2/m3 7 mm and less 160 200 m2/m3 Two Coat Seals Aggregate Size Number of Thicknesses Application Rate m2/m3 First coat >200 vehicles/day 950/ALD < 200 vehicles/day 900/ALD Second Coat 10 1 1050 1100 / ALD 7 (ALD known) 1 1100 1150 / ALD 5 or 7 (no ALD) 1 250 - 300 5 or 7 (no ALD) 2 175 - 225