General
Material separation: Place materials of different grading or from different sources in separate layers or separate sections of the work.
Spreading: Spread material in uniform layers. Do not segregate the material.
Layer thickness: 100-150 mm (after compaction) to suit the construction process. Use equal layers in multi layer courses.
Moisture content of underlying layers: Adjust the surface moisture content of underlying layers to prevent new material losing moisture.
Joints
Plan the spreading and delivery to minimise the number of joints. Offset joints in successive layers by at least 300 mm.
Existing road surface as subgrade
Carry out minor reshaping to improve vertical alignment as directed. Do not otherwise lower or excavate the existing roadway. After final shaping of the metal box, scarify the existing pavement forming the subgrade before placement of the pavement material.
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