This article describes the new techniques which have been developed during the past three years, following the publication of Technical Memorandum H5/69 which approved the use of unreinforced concrete slab construction without expansion joints provided the work was carried out between April 21 and October 21. The techniques were used in three road construction projects: (1) The A-12 4Rm-long Margaretting By-pass in Essex in which the principal innovation in slip-forming was the successful positioning of dowel bars in the transverse contraction joints, which are spaced at 5M centers without the need for prefabricated joint assembilies set ahead of the paver; (2) The A449 New Midlands Road, an unreinforced concrete structure with dowelled contraction joints at 20 ft intervals; and (3) the Gerrards Cross Motorway Bypass, for which the Errut CXCA plastic grooving machine for producing anti-skid texture on new concrete roads was used for the first time. Details are given of the slip form pavers used, formation of transverse contraction joints and longitudinal joints, concrete mix design and laying, and grooving techniques and equipment. /TRRL/

  • Corporate Authors:

    IPC Building and Contract Journals Limited

    32 Southwark Bridge Road
    London SE1 9EX,   England 
  • Publication Date: 1973

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00083166
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Jul 2 1975 12:00AM