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2015/2016 Standard specification for road maintenance



2015/2016 Standard specification for road maintenance


Standard specification for road maintenance; Reports; PublicationNT




Made available via the Publications (Legal Deposit) Act 2004 (NT).




Roads -- Northern Territory -- Maintenance and Repairs -- Periodicals

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Department of Infrastructure

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CONCRETE MAINTENANCE STANDARD SPECIFICATION FOR ROAD MAINTENANCE DoI REFERENCE TEXT October 2015 Page 83 Maintain all surfaces, including those within loosened formwork, in a moist condition by: flooding; continuous spraying with water; or other methods approved by the Superintendent. Prevent staining during the curing process of all concrete surfaces that will be visible in the completed works. Continuously maintain the protection and curing of each element for the minimum time specified by AS 3600 to provide the concrete with durability corresponding to the specified exposure classification. Do not use curing compounds in lieu of moist curing unless approved. Backfilling 9.11.2 Backfill areas around the concrete with specified material. Compact the backfilling in layers not exceeding 150 mm compacted thickness. Reinstate damaged grassed areas with topsoil and grass seed to match existing surrounds. PATCH REPAIR OF CONCRETE 9.12 STRUCTURES Remove spalled and unsound concrete to expose a sound surface. Where necessary remove damaged steel reinforcement and replace as required. Saw cut outer perimeter of the repair to a depth of at least 15 mm in order to prevent featheredging. Scabble and wash down the surrounding sound concrete surface to ensure removal of all contamination. Pre wet the prepared concrete substrate and steel reinforcement and apply a bonding agent to enhance the bond at the repair interface. Erect formwork as per FORMWORK clause and cure as per CURING clause. RAIN DAMAGE 9.13 Remove and replace rain damaged concrete. EXISTING SERVICES HOLD POINT 9.14 Hold Point - Obtain the Superintendents approval before altering the line or level of existing services. Place an expansion joint between concrete works and service. CONFORMANCE 9.15 Refer to the DRAINAGE MAINTENANCE for culvert structures and pits. Conform to Table 9.3 Concrete Conformance - Tolerances. Table 9.3 Concrete Conformance - Tolerances AS Measured Tolerance Finished level: + or - 15 mm from the specified level. Invert level: + or - 5 mm from the specified level. Straight edge deviation of surface: 3 mm maximum in 3 m, or 6 mm maximum in 15 m. Alignment: + or - 10 mm from the specified alignment. Chainage at vehicle crossing + or - 150 mm Width of vehicle crossing: + or - 25 mm. DEFECTIVE CONCRETE AND 9.16 MATERIALS Concrete which is not placed, cured or finished as specified, does not have the specified strength or other specified properties, is not sound, dense, durable or crack-free will be considered defective. Bear all cost and delays resulting from the rejection of concrete and subsequent rectification. Remove the concrete to a point agreed with the Superintendent at which a visually and structurally acceptable construction joint can be made, and the defective element rebuilt. Repair defective surface finishes if approved by the Superintendent. Approval will not be given if the defective area is too extensive or the techniques proposed are not adequate to ensure a visually acceptable and durable repair. MAINTENANCE CLEANING 9.17 High pressure water may be used for cleaning of concrete paths and structures. Clean surfaces at a pressure rating that will provide an even, streak free cleaned surface without causing damage. Chemicals may be used to remove specific types of stains or to ease cleaning and must be used in accordance with the product SDS and environmental requirements. Mask or protect adjacent surfaces. OTHER REQUIREMENTS 9.18 (If applicable) Refer to PROJECT SPECIFIC REQUIREMENTS section of Request for Tender.

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