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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.

Publisher name

Department of Infrastructure

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Second edition

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PROTECTION WORKS STANDARD SPECIFICATION ROADWORKS DoI REFERENCE TEXT December 2015 Page 91 Where used in trenches or other drainage configurations, place the geotextile to the shape of the prepared surface, folding and overlapping where required. Fully envelope drainage materials in trenches. Unless specified elsewhere in the contract, the overlap must be minimum 300 mm. Overlap to be minimum 500 mm where large ground deformations are expected. Sewing may be permitted provided the seam strength exceeds the parent material grab strength. Direct travel of machinery over geotextile not permitted. Where required, conform to the following initial layer of material thicknesses: Table 13.1 - Minimum Initial Layer Thickness (mm) Nominal Maximum Particle Size D85 of Initial Fill Layer (mm) Minimum Initial Layer Thickness (mm) < 150 300 150 - 300 400 300 - 500 500 Rock armour placed directly on geotextiles must be placed with a drop height of less than 1.5m, and placed in a such a manner so as not to damage, puncture or tear the geotextile. Obtain Superintendent approval for use of vibratory compaction methods on the initial layer. 13.3.5 Geotextile Grades Unless specified elsewhere in the contract, use: non-woven, Strength Grade B. All strength grades, where specified, based on a Characteristic Values (Q), to conform to the table: Table 13.2 Geotextile Strength Grade Properties Geo textile Strength Grade Elongation (1) Grade Strength (2) (N) Tear (2) (N) G Rating (2) A >30% <30% 500 800 180 300 900 1350 B >30% <30% 700 1100 250 400 1350 2000 C >30% <30% 900 1400 350 500 2000 3000 D >30% <30% 1200 1900 450 700 3000 4500 E >30% 1600 650 4500 Notes: (1) % Elongation corresponding to max CBR burst strength as per AS 3706.4. Generally <30% for wovens, >30% for non-wovens. (2) Property value is 80th percentile characteristic value (mean strength 0.83 x standard deviation), as per relevant AS test. Filtration properties relevant to each grade to be certified as part of 13.3.3 Delivery and Product Certification requirements. 13.3.6 Conformance Testing Where project requirement is less than 15,000 m2, sampling and testing is not required. Provide samples to independent, NATA accredited testing laboratory when project exceeds 15,000 m2, to the following test frequencies: Table 13.3 Test Frequencies Description Units Test Method Test Frequency Tensile Strength kN/m AS 3706.2 1 per 15,000 m2 Tear Strength N AS 3706.3 1 per 15,000 m2 CBR Burst Strength N AS 3706.4 1 per 15,000 m2 Grade Tensile Strength N AS 2001.2 .3.2 1 per 15,000 m2 Flow Rate l/m2/s AS 3706.9 1 per 90,000 m2