VERY EARLY POST-TENSIONING OF PRESTRESSED CONCRETE PAVEMENTS. INTERIM REPORT

Temperature and shrinkage cracks occur in long prestressed concrete pavements during the first night after casting, before the post-tensioning operation is performed. Previous post-tensioning schedules and current design criteria by ACI, PTI, and AASHTO do not guarantee that compression can be introduced before the cracks form. This report (1) presents a more detailed discussion of the problem of temperature and shrinkage cracking, (2) reviews some of the literature on early concrete strength and anchorage zone stresses, (3) describes tests on the capacity of anchorage zone for very early post-tensioning, and (4) recommends a post-tensioning schedule accompanied by design aids. Experimental test variables included slab thickness, strand spacing, anchor size, and time from casting. (Author)

• Supplemental Notes:
  • Study conducted in cooperation with the Federal Highway Administration. Research Study Title: Prestressed Concrete Pavement Design--Design and Construction of Overlay Applications.
• Corporate Authors:

  University of Texas, Austin

  Center for Transportation Research, 3208 Red River Street
  Austin, TX  United States  78705

  Texas State Department of Highways & Public Transportation

  Transportation Planning Division, P.O. Box 5051
  Austin, TX  United States  78763

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • O'Brien, J S
  • Burns, N H
  • McCullough, B F
• Publication Date: 1985-6

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: 184 p.

Subject/Index Terms

• TRT Terms: Concrete pavements; Cracking; Posttensioning; Prestressed concrete; Shrinkage; Stresses; Temperature
• Old TRIS Terms: Shrinkage cracks
• Subject Areas: Construction; Highways; Materials; Pavements; I32: Concrete;

Filing Info

• Accession Number: 00457720
• Record Type: Publication
• Report/Paper Numbers: FHWA-TX-86-05+401-1
• Contract Numbers: Project 3-8-84-401
• Files: TRIS, USDOT, STATEDOT
• Created Date: Aug 31 1986 12:00AM