Territory Stories

Standard specification for road works 2015/2016

Details:

Title

Standard specification for road works 2015/2016

Collection

Standard specification for road works; Reports; PublicationNT

Date

2015

Description

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

Notes

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

Language

English

Subject

Roads -- Northern Territory -- Works -- Periodicals.

Publisher name

Department of Infrastructure

Place of publication

Palmerston

Edition

Second edition

Parent handle

https://hdl.handle.net/10070/265830

Citation address

https://hdl.handle.net/10070/456054

Page content

PAVEMENTS AND SHOULDERS STANDARD SPECIFICATION ROADWORKS DoI REFERENCE TEXT December 2015 Page 49 Remove organic materials such as timber, picking branches, roots and the like by manual stick methods. Do not place material on a previous layer that has: - become waterlogged or cracked; and/or - otherwise deteriorated. Mix the material uniformly throughout with water to achieve a moisture content within 2% of the optimum for the specified conforming Dry Density Ratio. Ensure water is clean and free from oil, alkali, organic or any other deleterious substances, and that the total soluble salts content is less than 3,000 mg/litre (total dissolved salts). Provide evidence of construction water salt content level. 6.4.4 Compaction Compact in uniform layers not less than 100 mm nor greater than 200 mm compacted thickness. Achieve a homogeneous mass with no compaction planes. Conform to the Dry Density Ratios specified in Table 5.11 Dry Density Ratios for Conformance in CONFORMANCE TESTING. 6.4.5 Final Pavement Surface Final pavement layers must be in a homogeneous, uniformly bonded condition free from layering, cracking, disintegration or surface tearing. The finished pavement layer must be dense, even textured and tightly bonded, free of laminations and roller indentations. The pavement layer must retain these characteristics after rotary brooming and be suitable to receive bituminous surfacing. Allow the top 75 mm of the pavement layer to dry back to a Moisture Ratio (Rm) equal or less than 65% for FCR and 70% for natural gravel. Moisture Ratio (Rm) is defined as follows: Rm = (100 x wf) wr where: Rm = Moisture Ratio, in percent wf = field moisture content, in percent wr = adjusted optimum moisture content, in percent. The Superintendent will carry out all testing to determine the Moisture Ratio. Remove sticks and any loose material. Ensure surface is free of cracking. Do not introduce new material to the surface after final compaction. Where pavement thickness is 200 mm or greater, scarify to not less than 100 mm depth and recompact where finish not achieved. Where pavement thickness is less than 200 mm scarify and recompact to full depth where finish not achieved. 6.5 RECONSTRUCTION AND REHABILITATION OF EXISTING PAVEMENTS 6.5.1 Widening Saw cut back the existing pavement by not less than 150 mm width on each edge to sound material. Excavate boxing for widening to the required depth below finished surface. Construct subgrade as specified in EARTHWORKS. Construct pavement and shoulder as specified. 6.5.2 Strengthening by Granular Overlay on Existing Pavement This clause is not applicable to pavements which are not sealed. Saw cut across existing pavement at each end of work. Cut shall be vertical and at least 100 mm deep to allow smooth transition to new work. If sealed, remove seal from existing pavement. Scarify local high spots to 75 mm below finished surface. Construct a strengthening layer over the full width of the existing pavement and shoulder and the widening as specified. 6.5.3 Strengthening by Granular Overlay on Re-worked Existing Sealed Pavement This clause is not applicable to pavements which are not sealed. Saw cut across existing pavement at each end of work. Cut shall be vertical and at least 100 mm deep to allow smooth transition to new work. Cut and/or add top-up gravel where required to achieve levels and gradelines. Wet mix existing seal into existing base layer, with pulveriser-mixing plant, to nominal depth specified. Moisture condition and compact re-worked existing pavement to the Dry Density Ratios specified in Table 5.11 Dry Density Ratios for Conformance in CONFORMANCE TESTING for sub-base requirements.