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
PAVEMENTS AND SHOULDERS STANDARD SPECIFICATION ROADWORKS DoI REFERENCE TEXT December 2015 Page 48 6.3.3 Blends of Natural Gravel and Fine Crushed Rock Not permitted in urban areas for sealed pavements. Conform to Table 6.1 - Natural Gravel Particle Sizes and Table 6.2 - Natural Gravel Properties in the finished condition. Use for heavily trafficked situations and where material is available. Refer to PROJECT SPECIFIC REQUIREMENTS in the RFT. 6.3.4 Sand Clay Comply with this clause when sand clay forms an integral part of the pavement and/or shoulder design. Obtain Sand Clay from sources of naturally occurring deposits. Produce required properties by screening, mixing or other processes necessary, to produce a material of a tightly bound nature, free of organic or other deleterious materials. Conform to the following requirements in the finished condition: PARTICLE SIZE DISTRIBUTION Table 6.5 Particle Size Distribution Sand Clay AS Sieve (mm) Percentage Passing 4.75 80 - 100 2.36 60 - 100 0.425 30 - 60 0.075 14 - 28 PROPERTIES Table 6.6 Sand Clay Properties Plasticity Index (PI): 20% maximum for sealed roads; 15% maximum for unsealed roads. Linear Shrinkage (LS): 1% - 8%. CBR: 4 day soaked at 95% MMDD to AS 1289. 50 minimum 6.4 CONSTRUCTION 6.4.1 Process Control Testing Hold Point Hold Point - provide the Superintendent with a program and procedure for process control testing for the project within 14 days of the awarding of the contract and before work is commenced on site. Base the process control testing on lots and comply with clause Error! Reference source not found. Error! Reference source not found. Include the following activities, as applicable: Extraction Area (Borrow Pit) investigative sampling, on a grid basis Extraction Area (Borrow Pit) confirmatory sampling, on a windrow/ stockpile basis On-formation testing, on a lot basis. Include the following elements of the work in the process control testing program as applicable; Fill Sub-grade Sub-base Base course Shoulders Stabilisation Refer to PROJECT SPECIFIC REQUIREMENTS in the RFT. Rework and retest failed lots a maximum of two times subsequent to an initial test failure. Following a third test failure rip up, remove and replace the entire failed layer before carrying out any further testing. Where relevant, provide additional process control testing procedures for concrete, bitumen and other elements subject to conformance testing by the Superintendent. The Contractor is responsible for the ordering up and payment of all process testing costs. Refer to the Conformance Testing clauses in MEASUREMENT AND PAYMENT. 6.4.2 Production of Natural Gravel and Sand Clay Materials Extraction Area (Borrow Pit) Work extraction areas (borrow pits) to achieve conforming material. Control depth of winning to avoid contamination of gravel by clay and other fine materials. Use front-end loaders or dozers to win, push up and windrow materials. Use of other plant requires approval from Superintendent. Screen, blend and condition materials to achieve specified material property requirements. 6.4.3 On-formation Mixing and Placing Place material in uniform layers over subgrade surface or lower layers of the pavement. Remove segregated and contaminated material from the site.