CMI SLIPFORM PAVER MAKES THE GRADE

An account is given of the paving techniques adopted by John Laing construction for the 7.8 km Windover to Funtley section of the m27 in Hampshire, in which the CMI slipform paver is laying two adjacent 7.15 m wide strips to form the three lanes and hard shoulder for each 14.3 m wide carriageway. The sub-grade is a gravelly, sandy clay mixture, with the 270 mm thick pavement being constructed on a type 1 crushed limestone sub-base. Joints, which are set out ahead of the paving units, follow a sequence of 3 warping to 1 contraction joint, all at 5m spacing. The placing and spreading of the concrete, compaction and finishing of the slab, and method of cutting transverse joints, are briefly described. Surface irregularity measurements using a multi-wheeled profilometer, indicate a good to fair standard of finish, so far. Mention is made of the problem of selecting a design sub-base thickness which will be adequate to carry construction traffic. Part of the m27 western carriageway will include a 1.8 km experimental section designed by the TRRL, the purpose of which will be to test the real life skidding resistance of concrete made with coarse limestone aggregate. /TRRL/

Media Info

  • Features: Figures; Photos; Tables;
  • Pagination: p. 24-26
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00125076
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Oct 18 1975 12:00AM