The laboratory shall be equipped with all testing equipment necessary to perform these tests. The asphalt manufacturer shall operate and maintain the equipment in good condition in accordance with NATA requirements. Testing Equipment Asphalt shall be tested for the properties and at the testing frequency shown in Specification 201 QUALITY SYSTEMS. Tests to be undertaken include: Testing Requirements Routine Testing – Full Test PSD & Bitumen Content (WA 730.1) Maximum Dry Density of Asphalt Rice Method (WA 732.2) Bulk Density & Void Content of Asphalt (WA 733.1) Stability and flow of Asphalt Marshall Method (WA 731.1) Routine Testing – Partial Test PSD & Bitumen Content (WA 730.1) Maximum Dry Density of Asphalt Rice Method (WA 732.2) Periodic Testing Moisture Content (AS/NZS 2891.10 or T660) Uniform Coating of Binder (AS/NZS 2891.11) Stripping Potential of Asphalt - Tensile Strength Ratio Test (AG:PT/T232) – using freeze/thaw conditioning. Asphalt shall be sampled in accordance with WA 701.1 with samples tested immediately they are taken. The number of tests undertaken shall be evenly spread across the entire period of production for each asphalt mix being tested within a shift. Sample testing frequency The first sample of asphalt in a shift shall be taken from the first 50 tonnes of asphalt manufactured in the shift for each type of mix being manufactured. First sample If the result of any test sample does not conform to any specified requirements another sample of asphalt shall be taken immediately and tested immediately for a Full Test. For the Stripping Potential of Asphalt - Tensile Strength Ratio, test specimens shall be compacted at the site testing laboratory prepared without reheating of the test sample or test portion. After preparation of the test specimens the Stripping Potential of Asphalt - Tensile Strength Ratio test may be completed in the site laboratory or another laboratory away from the site of the asphalt plant. Preparation of TSR Specimens Results of testing, except for TSR, shall be reported on a NATA endorsed test report within 24 hours of a sample being taken. The testing laboratory shall send all results directly to, amongst others, the Contractor, the Superintendent and a nominated representative at the Main Roads Materials Engineering Branch. Reporting 510.36 NON-CONFORMANCE
For asphalt produced as warm mix asphalt using Sasobit 125°C to 155°C. If a delay occurs of more than 30 minutes between successive truck deliveries to the paver, the machine shall be moved clear of the laid asphalt and a proper transverse joint formed. Delays Prior to commencing each day’s operations, and also after any delay exceeding half an hour during the day, the screed shall be preheated for at least 15 minutes in order to eliminate drag marks and imperfections in the finished mat. Screed to be Preheated All kerbs, gullies, grates and other structures shall be protected at all times from damage or defacement by asphalt placement works and the site shall be left in a clean and tidy condition. Damage A sprayed seal shall be applied to the uppermost layer of 14mm asphalt intermediate course no more than 2 working days after completion of the uppermost layer of 14mm asphalt intermediate course. The seal shall comply with: Seal on Intermediate Course a single seal in accordance with Specification 509 POLYMER MODIFIED BITUMINOUS SURFACING. S35E binder at 1.4 L/m2 and 10mm aggregate at 150 m2/m3 In cold or cooler months, when the seal will be trafficked (construction traffic or public traffic) or where specified apply a double double seal in accordance with Specification 503 BITUMINOUS SURFACING. 1st coat CRS/170-60 bitumen emulsion at 0.9 L/m2 of emulsion and 10mm aggregate at 140 m2/m3. 2nd coat CRS/170-60 bitumen emulsion at 1.1 L/m2 of emulsion and 5mm aggregate at 250 m2/m3. 510.42 SURFACE PREPARATION Prior to the placement of asphalt, the Contractor shall carry out preparation work as detailed in the following clauses. General The Contractor sweep all surfaces on which asphalt is to be placed under this contract to a clean condition with no appreciable amounts of loose materials or any other foreign matter remaining. Loose surface material against kerbing shall be removed by handwork if necessary. The surface to be paved shall be dry. Sweeping The pavement layer below the first layer of asphalt shall have a uniform texture with a tightly bonded surface and be primed. The texture of this surface should key the asphalt to the surface and resist any tendency for “slippage” failures. Surface Condition
201331-0032 Pavement Series – Typical details Granular transverse joints 201331-0033 Pavement Series – Typical details full asphalt longitudinal joints and profile 201331-0035 Wearing Course Series – Typical details OGA/DGA transverse joints 201331-0036 Wearing Course Series – Typical details DGA transverse joints 201331-0037 Wearing Course Series – Typical details SMA transverse joints 201331-0038 Wearing Course Series – Typical details longitudinal joints 510.51 SPREADING All asphalt shall be spread with a paver except for small areas where use of a paver is not practicable. Where specified, in Annexure 510A two pavers in echelon shall be used in locations where a full carriageway wider than 6 m is available clear of traffic. The uppermost layer of asphalt intermediate course shall be 14mm dense graded asphalt intermediate course. Unless approved otherwise by the Superintendent, other layers of asphalt intermediate course shall be constructed using 20mm asphalt intermediate course. Uppermost intermediate Course Layer Nominal 20mm asphalt intermediate course be placed in layers of compacted thickness not less than 60mm and not greater than 90mm. Nominal 14mm asphalt intermediate course shall be placed in layers of compacted thickness not less than 45mm or greater than 55mm. Layer Thickness Asphalt intermediate course other than the uppermost layer of asphalt intermediate course shall be covered with the next layer of asphalt intermediate course no more than 2 working days after completion of rolling of the layer to be covered. Maximum Time Between Layers A layer of asphalt intermediate course or wearing course shall not be placed over the preceding layer until the maximum surface temperature at any point on the surface of the preceding layer has cooled to 63ºC or less. The temperature shall be measured on a surface free of surface moisture. The requirement is not applicable where the work will not be opened to public traffic for at least 12 hours. Temperature of Previous Layer 510.52 - 53 NOT USED 510.54 COMPACTION