Milling
- Milling works shall proceed on the marked area using
the milling machine to the required depth.
For milling of more than 50 mm depth, the transverse key joint with
‘step’ shall be observed as shown in the drawing.
- During milling, the depth shall be checked
periodically to ensure compliances with the specifications requirement.
- The milling waste shall be hoarded
onto lorries and transported to the designated dumpsite outside the R.O.W.
- The milled surface area shall be cleaned of all
loose aggregate with the use of mechanical power broom or equivalent. Air compressor is to be put on stand-by in
case of raining.
- Transverse joint shall be cut with diamond cutter. The cutting depth shall be the same as
wearing course layer thickness. The
joint shall be ensured to be at perpendicular with the beneath layer.
- For milling beyond the ACWC layer, ‘stepping’
procedure shall be carried out on both ways: parallel and perpendicular to
traffic flow. The stepping shall be as shown
in the following diagram:
- For transverse joint, stepping shall be at 20 meters
or as directed by the Engineer.
- For longitudinal joint, the stepping shall be at 150
mm from both edges of milled surface as shown above.
