DETERMINATION OF SHRINKAGE CHARACTERISTICS OF CONCRETES WITH TYPE K CEMENT, MINERAL AND CHEMICAL ADDITIVES

Laboratory and field work was conducted to evaluate shrinkage and cracking tendency of various concrete mix designs. Two simple span bridge decks were placed on Rt. 101 over Bloody Brook in Exeter, New Hampshire during the summer of 1997. One of these decks was made with Type k cement and the other was a control mix design using a Type II low alkali cement with a 50% substitution of ground granulated blast furnace slag (GGBFS). Both decks were instrumented with thermocouples and strain gauges bonded to reinforcement in the transverse and longitudinal directions. Relative humidity, wind speed, wind direction, solar intensity, rainfall, air and deck temperature, and reinforcement strain were monitored. Neither deck developed visible cracks in the first year of monitoring. Laboratory testing using modified cracking tendency rings and prisms showed that some mix designs are effective in reducing shrinkage. An expansive Type k cement was found to offset drying shrinkage. A shrinkage reducing admixture (SRA) at a mid dosage was shown to significantly reduce drying shrinkage. Water reducers, silica fume and high alkali cement were shown to in general increase shrinkage. Low alkali cement, GGBFS and SRA were shown to in general lower shrinkage.

• Record URL:
  https://ntlrepository.blob.core.windows.net/lib/17000/17900/17993/PB2001105950.pdf
• Record URL:
  https://mm.nh.gov/files/uploads/dot/remote-docs/nhdot-research-12323j-2001-report.pdf
• 
• Corporate Authors:

  University of New Hampshire, Durham

  Department of Civil Engineering
  Durham, NH  United States  03824

  New Hampshire Department of Transportation

  John O. Morton Building, 7 Hazen Drive
  Concord, NH  United States  03302-0483

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Gress, D
• Publication Date: 2001-4-10

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: 56 p.

Subject/Index Terms

• TRT Terms: Admixtures; Bridge decks; Concrete; Cracking; Durability; Field tests; Laboratory tests; Mix design; Monitoring; Shrinkage; Silica fume; Slag; Strain gages; Thermocouples; Water reducing agents
• Uncontrolled Terms: High alkali cement; Low alkali cement; Type K cement
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 00812496
• Record Type: Publication
• Report/Paper Numbers: FHWA-NH-RD-12323J,, Final Report
• Contract Numbers: SPR-0004(013)
• Files: NTL, TRIS, USDOT, STATEDOT
• Created Date: Jun 15 2001 12:00AM