Territory Stories

Standard specification for road works 2015/2016



Standard specification for road works 2015/2016


Standard specification for road works; Reports; PublicationNT




Made available via the Publications (Legal Deposit) Act 2004 (NT).; Check within Publication or with content Publisher.


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.

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Department of Infrastructure

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Second edition

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LANDSCAPE STANDARD SPECIFICATION ROADWORKS DoI REFERENCE TEXT December 2015 Page 118 Table 16.4 Initial Hole Preparation Chart Land Categories And Soil Characteristics Marine Sediments Soil And Gravel (depth greater than 600 mm) Shallow Soils Surface Rock (soil depth overlaying rock less than 600 mm) Visual appearance Grey and brown muds, silts and clays: occasionally pale beach sands Usually red, yellow and brown sandy loams to sandy clay loams with varying amounts of ironstone gravel; occasionally siltstone and quartz gravel Soil material similar to Category 2, overlaying laterite on siltstone* Very little or no soil; extensive areas out of cropping laterite on siltstone* Operational Steps Initial Rock Break - - - Rip and rock break. Initial Excavation Hole size dependent upon species and area Excavate to 600 mm. Excavate hole till machine rejection (commonly bed rock layer). Excavate hole to 600 mm minimum. Secondary Rock Break - - Rock break bottom to a depth of 1200 mm. Rock break bottom further 600 mm down. Secondary - Excavate rocks. Excavate rocks greater than 150 mm. Excavate rocks greater than 150 mm. Excavation Hole Backfilling In situ excavated material If excavated soil has less than 30% gravel, then no additive is required. Backfill with imported topsoil. Backfill with imported topsoil. If excavated soil has 30 to 70% gravel, then a 50% mixture with imported topsoil is required. If excavated soil has greater than 70% gravel, then backfill of imported topsoil is required. NOTE If existing soil is free draining or humic, then it may be substituted for imported topsoil. * Laterite - rough textured rock, reddish brown in colour, with orange and yellow mottles (splotches of colour), contains ironstone gravels and pores. * Siltstones - relatively smooth textured, white, reddish and yellowish layered rock, often with mottles. No ironstone gravel and pores.