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
SLURRY SURFACING STANDARD SPECIFICATION ROADWORKS DoI REFERENCE TEXT December 2015 Page 77 10.6 PLANT & EQUIPMENT 10.6.1 Mixing Machine Use a self-propelled slurry mixing machine with a continuous flow pugmill able to accurately proportion and deliver mineral aggregate, filler, bitumen emulsion water and additive to the mixing chamber and discharge the thoroughly mixed product on a continuous basis. DIP STICKS; Use a dipstick on the emulsion and water tanks calibrated to in intervals of 50 litres and on the additive tank use a dipstick calibrated in intervals of 10 litres. FINES FEEDER; Equip the mixing machine with a suitable fines feeder which provides an accurate metering device to introduce a predetermined amount of mineral filler into the mixer at the same time and in the same location as the mineral aggregate. Provide calibrated controls capable of accurately proportioning the materials. WATER PRESSURE SYSTEM; Equip the mixing machine with a water pressure system and a fog type spray bar capable of completely fogging the road surface preceding the spreading equipment to a maximum application of 0.3 litres per square metre. MACHINE STORAGE; For truck or semi-trailer mounted slurry surfacing machines provide sufficient machine storage capacity to allow the adequate mixing and application of a minimum of 7 cubic metres of slurry mixture. This provision does not apply to continuous run slurry surfacing machines. GUIDE ARM; Fit the machine with a guide arm and chain to assist the driver in following the correct line. Mount the guide arm on the drivers side of the vehicle, forward of, and in full view of the driver. 10.6.2 Spreading Equipment Attach to the mixing machine a mechanical spreader box distributor, equipped with flexible material in contact with the pavement surface to prevent loss of the slurry surfacing mix from the spreader and capable of distributing the slurry surfacing mix across the width of the box without segregation or overflow while assuring by its design and adjustments that the required width and depth of spread are maintained on varying grades, crowns and superelevations. SPREADER BOX; Use a spreader box with an adjustable width, capable of spreading up to 4.0 metres in width and equipped with skis or other levelling device to enable it to fill traverse depressions up to 1.5 metres across. STEERING; Use a spreader box with an adjustable steering device and a flexible strike-off. 10.6.3 Ancillary Plant Provide all ancillary plant such as rotary road brooms, signs, lamps, barricades, hand squeegees, shovels, hand brooms and any other equipment necessary for the performance of the work. 10.7 MIX REQUIREMENTS 10.7.1 General Blend the bitumen emulsion with the mineral aggregate and filler in the proportions, by dry mass of aggregate, including filler, to give the required bitumen content of the slurry surfacing mix as specified in Table 10.1 - Standard Mixes. Add sufficient water to provide a mix of workable consistency and this may be varied slightly to suit the surface texture of the pavement and the pavement temperature. 10.7.2 Sample Mixes Hold Point Make trial batches to determine the final blend of water, additive and cement to be used for the best results. Hold point - At least 14 days before commencing work, forward the details of the mix design, carried out in a NATA registered laboratory and performed by a NATA accredited Table 10.1 - Standard Mixes Sieve Size (mm) Percentage Of Mineral Aggregate Passing Sieve By Mass Nominal Mix Size 7 mm 5 mm 13.2 100 100 9.5 100 100 6.7 85-100 100 4.75 70-90 90-100 2.36 45-70 50-70 1.18 28-50 35-50 0.60 19-34 20-35 0.30 12-25 12-25 0.15 7-18 7-18 0.075 5-15 4-10 Residual binder content as % mass of aggregate 6.5-9 7-9.5