Kingscote Streets Upgrades - Kangaroo Island Council

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Mechanical spreading equipment shall be used to spread aggregate and capable of achieving a uniform spread rate. Spreading equipment shall be calibrated as detailed in the quantity requirements of this specification. Rollers shall be pneumatic tyred multi-wheel rollers with a minimum mass of 7 tonnes, smooth tyres and a minimum tyre pressure of 690 kPa. Rollers must be capable of achieving effective incorporation of aggregate into the binder without breakdown or crushing of the cover aggregate. 7.4.9 Pavement Temperature and Weather Conditions The Contractor shall measure and record pavement temperatures at regular intervals during the works using appropriate equipment and measurement procedures. Spraying of primers, primer binders and binders should only be undertaken if the pavement temperature has been at or above the temperature shown in the following table and does not fall below the recommended minimum pavement temperature during the period of spraying. Table 7.1 Type of work Minimum Pavement Temperatures Minimum Pavement Temperature Priming 10°C Primer Sealing 10°C Sealing – Class 170, Class 320 15°C Sealing – Bitumen Emulsion 15°C Sealing – Polymer Modified Binder 20°C Spraying shall not be carried out on a wet pavement, while rain appears imminent orduring strong winds (wind speed greater than 20 km/hour) or dust storms. Surfaces to be primed should be dry, and no more than damp to the depth of pavement penetration. If necessary, the pavement surface may be lightly watered shortly before applying the primer binder. Surfaces to be sealed should be dry and clean. 7.4.10 Primer and Primer-Binder 7.4.11 Binder The class grade and rate of application of the primer or primer-binder shall be as detailed in the approved pavement design and confirmed by the Contractor based on site conditions. After the application of the primer, a period of at least 48 hours, or a longer period as required to obtain a thoroughly dry surface prior to the application of the binder for a seal is applied. Subject to the site conditions, the Superintendent may authorise a shorter curing period. Traffic shall be kept off the primer surface until it has dried sufficiently to minimise the risk of damage to the surface. The Contractor shall supply, place and maintain traffic management necessary to comply with this requirement. The class or type of bitumen, modified bitumen, cutback bitumen, or bitumen emulsion shall be as specified in the Contractors spray seal pavement design and confirmed by the Contractor based on site conditions. No binder shall be placed until the Superintendent has inspected and approved the prepared pavement surface. The Contractor shall determine and record the proportion of cutter oil required for each spray load. Cutter oil shall be added at the site in accordance with DTEI Master Specification Part 226 Appendix 5. Flux shall not be used. Bitumen adhesion additives shall comply with DTEI Master Specification Part 226. Ref No. 20120236SA1 Kingscote Streets Upgrades Technical Specification 33
The application temperatures for primes, primer-binder and binders shall comply with the following table. Table 7.2 Application Temperatures for primes, primer-binders and binders Product Spraying Temp Min (⁰C) Uncut Re-heating Temp Max (⁰C) Uncut Spraying Temp Min (⁰C) Cut Re-heating Temp Max (⁰C) Cut Light Prime 15 30 na na Medium Prime 40 60 na na Primer Binder 95 120 na na C170 175 185 Resultant 185 C320 175 185 Resultant 185 PMB 190 200 185 190 Crumb Rubber 190 200 190 200 Multigrade 175 185 Resultant 185 Emulsion Manufacturer’s recommendation 90 na na Note: For cut C170, C320 and Multigrade the binder shall be heated to 185⁰C, additive and/or cutter added and then sprayed at the resultant temperature. Volume correction factors for converting bituminous binders from 15⁰C to elevated temperatures shall be in accordance with DTEI Master Specification Part 226 Appendix 1 and Appendix 2. 7.4.12 Operation of the Sprayer The application of primer, primer binder, and binder shall be by mechanical sprayer. Hand spraying will only be permitted when the use of a mechanical sprayer is not practicable. All sections of road 8 m or less in width and with the same application rate shall be sprayed in one pass. Where part width spraying is used, the Contractor shall submit in the Quality Plan details of how they intend to ensure uniform application of binder across the joint. The spraying for each run of the sprayer shall commence on a protective strip of heavy paper laid across, and held securely to, the pavement surface beforehand. The sprayer shall ensure that the road speed for correct application is attained at the commencement of spraying. The sprayer shall maintain a constant road speed throughout the length of each sprayer run. Where the spray seal design includes a double/ double seal, both courses the seal shall be laid on the same day. 7.4.13 Spreading and Rolling Aggregate Spreading of aggregate shall proceed as close as practical after spraying of the binder has commenced and shall be completed within five minutes of spraying. The Contractor shall uniformly spread the specified nominal size aggregate at the target application rate uniformly over the sprayed surface by means of suitable mechanical spreading equipment. Sufficient loaded trucks of aggregate shall be at the site to provide full cover for the area sprayed. The method to determine the actual aggregate spread rate shall be detailed in the Quality Plan. Rolling shall commence immediately after aggregate spreading has commenced. Sufficient rollers shall be supplied to ensure that total area sprayed receives the minimum coverage (roller hours) derived from the following table and to cover the full width to be sealed with one pass. Adequate time must be allowed at the end of the day’s work to ensure that the last materials spread receive adequate rolling. Ref No. 20120236SA1 Kingscote Streets Upgrades Technical Specification 34
Page 1 and 2: Kingscote Streets Upgrades Technica
Page 3 and 4: Table of Contents 1 General Provisi
Page 5 and 6: 5.2.2 Quality Testing 23 5.2.3 Tole
Page 7 and 8: Table 4.2 Compaction requirements f
Page 9 and 10: Table Error! No text of specified s
Page 11 and 12: The Contractor shall be responsible
Page 13 and 14: • Lateral supports - provide late
Page 15 and 16: • Material, which, after compacti
Page 17 and 18: All areas disturbed by the excavati
Page 19 and 20: 3.3.8.2 Placing Fill The method of
Page 21 and 22: 3.4.2 Materials Suitable materials
Page 23 and 24: 3.4.5 Tolerances Construction Toler
Page 25 and 26: 4.2.4 Concrete Concrete grade for d
Page 27 and 28: 4.3.8 Pipe Surround Bedding materia
Page 29 and 30: No pumping will be permitted during
Page 31 and 32: All concrete work shall be in accor
Page 33 and 34: 5 Pavement Subgrade This section of
Page 35 and 36: 5.2.4 Acceptance Criteria Areas whe
Page 37 and 38: 6.3.3 Compaction of Granular Paveme
Page 39 and 40: The following test procedures shall
Page 41 and 42: 7 Spray Seals This section of the s
Page 43: • retains aggregate after applica
Page 47 and 48: 7.5 Quality Requirements - Spray Se
Page 49 and 50: 8 Kerbing This section of the speci
Page 51 and 52: Wherever the work of placing concre
Page 53 and 54: 9 Verges, Footpaths and Driveways T
Page 55: Footpaths and driveways Absolute ±

Kingscote Streets Upgrades - Kangaroo Island Council

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