I'm currently facing difficulty locating a reference for the transverse joint configuration for widening of a flexible pavement. From memory, I recall using a range of 300mm to 500mm for transverse joints, but I'm unable to find any specific reference to support this.
If you have a moment, could you please assist me by providing any relevant information or references on transverse joint configurations in New Zealand - Australia Context?
Your help would be immensely valuable. For your reference, I attached a snip which illustrates the guidance I found in "Guide to Pavement Technology Part 2: Pavement Structural Design" for longitudinal joints.
for transverse joint configurations in flexible pavement widening projects in the New Zealand-Australia context, you may refer to documents such as the Austroads Guide to Pavement Technology and the NZ Transport Agency's pavement design guidelines. Additionally, consulting with local transportation authorities or industry experts could provide specific insights and references tailored to your project.
G'day
The Brisbane City Council Infrastructure Design Planning Scheme Policy as part of CityPlan 2014 has the following comment:
"Where full-depth asphalt pavements are to be constructed alongside existing granular pavements, the design must consider the possible effect on subsoil drainage of the pavement, and the need for additional subsoil drainage to prevent ‘tanking’."
3.5.7.2
Widening of existing pavements
Brisbane City Council Reference Specifications for Engineering Work S150 Roadworks has the following clause:
3.3 Junctions with Existing Pavements
Granular Pavement: Where the pavement is to be joined to an existing granular pavement, remove a strip of the existing pavement at least 300 mm wide for its full depth and trim the edge to an angle of approximately 45° in steps of maximum height 150 mm before placing new pavement material.
Asphalt Pavement: Where the pavement is to be joined to an existing full depth asphalt pavement, cut back into the existing asphalt by at least 100 mm. Extend each subsequent layer of structural asphalt into the existing pavement by at least 100 mm. The surface layer of asphalt is to extend into the existing pavement at least 150 mm beyond the upper most structural layer placed. Treat each layer as a cold joint as detailed in Reference Specification S320.
Reference Specification S320 includes:
Cold joints: Form clean and straight joint by employing appropriate machine cutting or hand cutting methods. For long lengths, trim back joint by sawing or using a cutting wheel (trimming angle of 45° or 60°) mounted on a piece of heavy equipment such as a steel wheel roller. Jack hammering may be suitable for small areas. Apply tack coat on the cut edges before placing the adjoining asphalt.
Longitudinal joints
General: Construct a longitudinal joint parallel to the pavement centreline if the width of the pavement is such that more than one paving run is necessary.
Location: In multiple layer work, offset joints in successive layers by at least 100 mm, except for longitudinal joints on a crowned pavement. Position longitudinal joints in the wearing course to coincide with the line marking.
Transverse joints
General: Construct a transverse joint after the completion of a day’s paving operation or where a delay in the paving operation allows material temperature to fall below 90°C or where the paving operation is stopped for more than 20 minutes.
Location: Construct to a straight vertical face for the full depth of the layer, and offset in adjoining spreader runs and layer to layer by at least 2 m.
As part of the "BITUMEN-POLYMER CONNECTING TAPE FOR REINFORCEMENT
THE UPPER LAYERS OF THE ROADS" we have outlived some views on this problem.
The possibility of using bitumen-polymer connecting tape to prevent damage in
the places of longitudinal and transverse joints of the upper layers of the pavement has been studied.
Сw building material is a strip of bitumen-polymer composite, which is able to maintain its original
geometric shape at sufficiently high temperatures during the entire storage period up to the moment
of its application.
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