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
Department of Infrastructure
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BITUMINOUS SURFACE MAINTENANCE STANDARD SPECIFICATION FOR ROAD MAINTENANCE DoI REFERENCE TEXT October 2015 Page 69 sided due to irregularities in the pavement and feathering repair techniques. Reconstruction patching Repairs with profiling, dig-out and/or squaring up, may be confined to the surface course or extend through all courses. Seal A sprayed application of bituminous binder into which aggregate is incorporated. May include more than one application of binder and aggregate, and may include geotextile fabric. Wearing surface The section of pavement upon which the traffic travels. This includes the layer(s) of asphalt or spray seal in a flexible pavement above the base. IDENTIFICATION AND TYPES OF 8.4 FAILURES The Superintendent will identify the defect and then order the appropriate method of repair by issue of a Contractor Service Request (CSR). Defect types are grouped into one of the following modes of pavement distress; Deformations: Includes: corrugations, depressions, rutting, and shoving. Cracks Cracks promote water entry and can be a primary cause of other defects including deformations and potholes. Edge breaks Occur along the interface of a sealed pavement and unsealed shoulder. Potholes Steep sided or bowl shaped cavities or delaminations extending into layers below the wearing course, usually due to failures associated with an aged, cracked or debonded bituminous surface. Patch An area of pavement surface where the original has been replaced or covered. Surface texture deficiencies Includes polishing, ravelling, bleeding. Generally rectified by reseal not specified in this section. REPAIR OPERATIONS 8.5 Undertake repair operations to rectify identified distress modes. Pothole Patching 8.5.1 Applies to potholes, delaminations, and edge break defects. Hole must be meticulously cleaned before repair, all loose and unbounded material must be removed. Trim edges to sound material, creating angle sides to the bottom. Tack coat the sides, bottom and lip of pothole for a minimum width of 20 mm with bitumen emulsion. Remove excess tack coat. Place patching material in layers no greater than 3 times the nominal size, and thoroughly compact. Finish the pothole slightly higher than adjacent pavement surface, between 3 mm and 5 mm. Level the patch by hand raking, motor grader or pull type blade. Remove all loose aggregate around the edges of the patch so patch can be raked and rolled to a smooth junction with the old surface. Compact asphalt material with hand tamper for small holes and where possible, compact by using a rammer or vibrating plate. Compact large patches with a vibrating smooth drum roller. Hot mix can be topped with a light application of sand to prevent pick up. Remove all waste materials from the road reserves and dispose in an approved manner. Temporary patching Hold Point 8.5.2 Hold point - Temporary patching with aggregate and emulsion requires approval of the Superintendent. For such work, keep traffic off the patch until patch is stable. Regulation Patching 8.5.3 Patch defect areas where only the surface needs repair. Applies to deformations. The Superintendent will specify the suitable type of hot mix asphalt for the patch material in the CSR. Remove all debris and any loose materials on the pavement. Repair any potholes or cracks as required, refer other clauses. Apply a tack coat to the area under repair at the application rate to suit surface conditions. Supply, place, spread and compact the asphalt in layers until finished surface is flush with the existing surface. Compact in layers approximately 3 times the size of the mix aggregate and bring up to surface in layers level with the intended surface profile. Compact smaller holes with vibrating plate compactor and/or mechanical tampers. Compact larger patches with a small vibrating roller. Depending on the size of the patch, level by hand raking, a pull type drag, or paver. Remove all aggregate larger than the feather edge so that the edges of the patch can be raked and rolled to a smooth junction with the old surface.
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