MEASUREMENTS OF SHRINKAGE AND CREEP STRAINS ON POST TENSIONED WAFFLE SLAB

Results are presented of laboratory and field measurements of strains due to prestressing, creep and shrinkage in a post tensioned waffle slab. Prior to prestressing, the concrete showed and initial expansion of about 100 times 10 to the minus 6th power. In the unstressed specimens the expansion turned to shrinkage after about 21 days with a contraction after 23 months of 170 times 10 to the minus 6th power. Measurements of the stressed slab showed a total shrinkage plus creep contraction of 340 times 10 to the minus 6th power. Measurements of shrinkage in the laboratory gave results more than twice those in the field. /TRRL/

• Supplemental Notes:
  • Presented at the Symposium on the Design of Concrete Structures for Creep, Shrinkage and Temperature Changes, Medrid, Spain, 1970, Final Report, Volume 6, Reports of the Working Commissions.
• Corporate Authors:

  International Association for Bridge and Structural Engineering

  ETH-Honggerberg, Wolfgang-Pauli-Strasse 15
  Zurich 8093,   Switzerland  CH-8093
• Authors:
  • Milston, A K
• Publication Date: 1970-12

Language

• English

Media Info

• Features: Figures; Tables;
• Pagination: 10 p.

Subject/Index Terms

• TRT Terms: Creep; Expansion; Field tests; Laboratory tests; Posttensioning; Prestressed concrete; Shrinkage; Slabs; Strain measurement
• Uncontrolled Terms: Field measurements; Waffle slabs
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00081740
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: Conf Paper
• Files: ITRD, TRIS
• Created Date: Apr 22 1975 12:00AM