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2015/2016 Standard specification for road maintenance



2015/2016 Standard specification for road maintenance


Standard specification for road maintenance; Reports; PublicationNT




Made available via the Publications (Legal Deposit) Act 2004 (NT).




Roads -- Northern Territory -- Maintenance and Repairs -- Periodicals

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Department of Infrastructure

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SPRAY SEALING MAINTENANCE STANDARD SPECIFICATION FOR ROAD MAINTENANCE DoI REFERENCE TEXT October 2015 Page 57 Manufacture of Polymer Modified Binders must meet the requirements of the Guide to Manufacture, Storage and Handling of Polymer Modified Binders, Australian Asphalt Pavement Association, 2013. SPRAYERS AND PERSONNEL 7.6 Sprayers must have current calibration accredited by a tester nominated on the Australian Asphalt Pavement Association website. All calibrated sprayers must be listed on the Australian Asphalt Pavement Association website. A copy of the calibration certificate must be with the vehicle at all times. Calibrate sprayers yearly. Ensure sprayer driver and operator are skilled and trained with an understanding of sprayer calibration and an appreciation of the requirements of the work. Ensure relevant personnel understand the types and quantities of the various materials and mixtures to be used. Bitumen Spraying plant and equipment must be in good working condition at all times. PREPARATION OF PAVEMENT 7.7 Remove raised reflective pavement markers. Repair any damage to the pavement surface caused by the removal of raised reflective markers with an emulsion/sand mixture before sealing. Sweep the pavement surface to remove loose stones, dust, dirt and foreign matter immediately before spraying. Do not use steel brooms on fine crushed rock type or low plasticity type materials or on airstrips. Maintain the prepared surface. Extend sweeping clear of the area to be sealed. Remove adherent patches of foreign material with a steel scraper. Dampen the prepared surface lightly immediately before spraying (for priming and primersealing only). Remove water from the surface of primed or sealed pavements before applying binder. Do not allow traffic on the prepared surface. SETTING OUT 7.8 Mark out by string line or paint. Include pavement widening. BINDER COAT REQUIREMENTS 7.9 General 7.9.1 The Contractor must rectify bleeding or flushing seals during the defined defects period where binder application rates were applied at greater than 105% of the designated volume. Prime, primer seals and enrichment 7.9.2 coats Provide bitumen complying with; Table 7.8 Polymer Modified Binders for Sprayed Sealing Applications. Generally bitumen class 320 for cut back as follows: Prime: AMC 0 to AMC 00 Primer Seal: AMC 5 to AMC 6 Enrichment Coat: CRS 170/60 (If applicable) Refer to PROJECT SPECIFIC REQUIREMENTS in the RFT for cut back requirements. Cut-back bitumen to be mixed on site. Heat bitumen to a temperature appropriate for achieving final spraying temperature making allowance for incorporation of the unheated cutter. Add unheated cutter to heated bitumen and circulate until a homogeneous mixture is achieved. Spray immediately circulation is complete. Allow at least three days to elapse after priming before applying the binder coat. Ensure primer soaks in and dries off before applying binder coat. Keep traffic off the primed surface for 3 days after priming. Use a primer seal if traffic cannot be kept off surface for 3 days. Straight Run Binder Coats 7.9.3 Provide bitumen Class 320 complying to AS 2008 as follows: Cross Reference Austroads Technical Report AP-T68/06 Update of the Austroads Spray Seal Design Method Austroads - Guide to the Selection and Use of Polymer Modified Binders and Multigrades APT235-13 (2013) Standard Specification for Roadworks, Spray Sealing (Department of Infrastructure) AS2008 - Bitumen for Pavements (2013) Definitions S10E A class of polymer modified bitumen, used for spray seal work, with an elastomeric modifier, conforming to specified binder properties in the Standard Specification for Roadworks It must be manufactured from bitumen that conforms to the classes in AS2008. SAMI Strain Alleviating Membrane Interlayer. A layer of seal sprayed onto an existing cracked surface, prior to asphalt resurfacing.

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