PRECAST FLAGS FOR A PARKING DECK

The use of precast paving flags on the inverted roof of a shopping and office centre car park in Leeds is described. With an inverted roof (one in which the component layers are reversed), the thermal insulation is placed above the waterproof membrane. Precast paving flags were used for the parking deck, suitable for cars and light van traffic. A jointing system developed by the Cement and Concrete Association is used. The flags have been laid to a stretcher bond pattern running perpendicular to the main traffic aisles, which helps prevent differential movement of the flags in one direction. Gaps between flags are sealed with a continuous bead of polyurethane based sealant applied to flag edges, although breaks in the sealing bead are left in the transverse joints to permit drainage. The transverse joints are 5 mm wide, whilst the longitudinal joints are 3 mm wide, and gap spacing is maintained by neoprene rubber pads of the appropriate thickness. This method of jointing provides a permanent flexible joint which, whilst permitting slight transient movements induced by the braking and turning of vehicles, should overcome long-term differential movement of the flags. Because experience over several weeks showed the sealant to be subject to approximately 5 per cent shrinkage, it was necessary to provide contraction joints. There were no signs of deformation during the first three months use. The system, whose cost compares favourably with others, has the advantage of easy access to the waterproof membrane. (TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00105317
• Corporate Authors:

  Concrete Society

  Devon House, 12-15 Dartmoutn Street
  London,   United Kingdom 
• Authors:
  • Smithers, M H
• Publication Date: 1985-8

Media Info

• Features: Photos; References;
• Pagination: p. 13-14
• Serial:
  • Concrete (London)
  • Volume: 19
  • Issue Number: 8
  • Publisher: CONCRETE SOCIETY
  • ISSN: 0010-5317

Subject/Index Terms

• TRT Terms: Construction management; Contraction joints; Costs; Forecasting; Joints; Longitudinal joints; Parking garages; Polyurethane resins; Sealing (Technology); Structural design; Transverse joints; Waterproofing materials
• Old TRIS Terms: Joint; Sealing
• ITRD Terms: 3352: Building (structure); 916: Car park; 3666: Construction method; 2998: Joint (structural); 4792: Precast concrete; 9149: Prevention; 4508: Sett (stone); 8119: United Kingdom; 3375: Waterproofing
• Subject Areas: Bridges and other structures; Construction; Finance; Highways; Terminals and Facilities;

Filing Info

• Accession Number: 00459894
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, TRIS
• Created Date: Nov 30 1986 12:00AM