STATISTICAL ANALYSIS OF CONCRETE STRENGTH VERSUS AIR ENTRAINMENT

A SERIES OF STRUCTURAL-GRADE CONCRETE TEST CYLINDERS WAS CAST AND TESTED IN THE LABORATORY TO DETERMINE THE DECREASE IN COMPRESSIVE STRENGTH TO BE EXPECTED WITH INCREASING LEVELS OF AIR ENTRAINMENT. REGRESSION ANALYSIS OF THESE DATA SHOWS THE DECREASE OF STRENGTH TO BE ABOUT 400 PSI FOR EACH 1 PERCENT INCREASE INCREASE OF AIR ENTRAINMENT WITHIN THE RANGE OF INTEREST BETWEEN 3 AND 10 PERCENT. ADDITIONAL TECHNIQUES ARE APPLIED TO CONSTRUCT A CURVE TO PREDICT PROBABLE REJECTION RATES WITH VARIOUS AIR ENTRAINMENT LEVELS THAT MIGHT BE SPECIFIED IN THE FUTURE. THESE RESULTS, COMBINED WITH ENGINEERING JUDGMENT, LED TO THE ADOPTION OF A NEW AIR SPECIFICATION OF 6.0 PLUS OR MINUS 1.5 PERCENT. OPERATING CHARACTERISTIC CURVES ARE DEVELOPED TO PREDICT PROBABLE REJECTION RATES FOR DIFFERENT LOT SIZES WITH THE NEW SPECIFICATION. A LOGARITHEMIC TRANSFORMATION OF THE DATA IS USED IN A SECOND REGRESSION ANALYSIS TO FURTHER EXPLORE THE FUNDAMENTAL RELATION BETWEEN AIR ENTRAINMENT AND STRENGTH.

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/hrr/1973/433/433-004.pdf
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0309021634
• Supplemental Notes:
  • Sponsored by Committee on Performance of Concrete-Physical Aspects and Committee on Quality Assurance and Acceptance Procedures. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
• Authors:
  • Weed, Richard M
• Conference:
  • 52nd Annual Meeting of the Highway Research Board
  • Location: Washington District of Columbia, United States
  • Date: 1973-1-22 to 1973-1-26
• Publication Date: 1973

Media Info

• Media Type: Print
• Features: Figures; Tables;
• Pagination: pp 35-41
• Monograph Title: Corrosion, concrete and quality control
• Serial:
  • Highway Research Record
  • Issue Number: 433
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Air entrainment; Compressive strength; Concrete; Concrete tests; Laboratory tests; Regression analysis; Specifications; Statistical analysis
• Subject Areas: Data and Information Technology; Highways; Materials;

Filing Info

• Accession Number: 00214281
• Record Type: Publication
• ISBN: 0309021634
• Files: TRIS, TRB
• Created Date: Dec 22 1973 12:00AM