DEVELOPMENT OF A LABORATORY PROCEDURE FOR EVALUATING CONCRETE MIXES FOR RESISTANCE TO SHRINKAGE CRACKING IN SERVICE

A laboratory investigation was conducted to develop an effective and convenient laboratory test set-up and procedure for evaluating concrete mixes for their resistance to shrinkage cracking in service. The three methods evaluated in this study include (1) a constrained ring specimen method, (2) a constrained long specimen method, and (3) a constrained plate method. Two different concretes (Florida Class II & Class IV) which had shown shrinkage cracking problems in service were used to evaluate these test methods. This research study has resulted in the development of a very promising testing and analysis method for evaluating concrete mixes for resistance to shrinkage cracking in service. Based on the test results from this study, the modified constrained long specimen method appeared to measure reasonable values of stresses and strains. The creep strains that might develop in the concrete during setting could be determined conveniently and effectively by means of this apparatus. Since the creep strain that developed in the concrete had the effect of reducing the induced shrinkage stress, proper determination of creep strain was crucial in the accurate estimation of shrinkage stresses in a concrete. The use of the modified constrained long specimen method makes a realistic determination of the induced shrinkage stresses possible. This testing and analysis method should be further evaluated, refined and implemented as a standard procedure for evaluating shrinkage cracking resistance of concrete used by the Florida Department of Transportation, especially for bridge deck applications.

• Record URL:
  https://ntlrepository.blob.core.windows.net/lib/20000/20300/20303/PB98122070.pdf
• 
• Corporate Authors:

  University of Florida, Gainesville

  Department of Civil Engineering, P.O. Box 116580
  Gainesville, FL  United States  32611-6580

  Florida Department of Transportation

  Haydon Burns Building, 605 Suwanee Street
  Tallahassee, FL  United States  32301

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Tia, M
  • Leung, T-M
  • Darku, D
  • RICHARDSON, D
  • Brown, D
• Publication Date: 1998-1

Language

• English

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: 93 p.

Subject/Index Terms

• TRT Terms: Admixtures; Cracking; Creep; Laboratory tests; Shrinkage; Strain (Mechanics); Stresses; Test procedures
• Old TRIS Terms: Shrinkage cracks; Strains
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 00746729
• Record Type: Publication
• Report/Paper Numbers: WPI 0510800, Final Rept,, State Job 99700-3367-010,, UF Proj 4910450456012
• Contract Numbers: B-A505
• Files: NTL, TRIS, ATRI, USDOT, STATEDOT
• Created Date: Mar 17 1998 12:00AM