PREDICTION OF POTENTIAL STRENGTH OF CONCRETE FROM THE RESULTS OF EARLY TESTS

A SERIES OF 3 EXPERIMENTS WAS CONDUCTED TO INVESTIGATE THE PRACTICALITY OF USING EARLY TESTS OF CONCRETE CYLINDERS MADE AT THE JOB SITE AS A MEANS OF QUALITY CONTROL AND STRENGTH PREDICTION OF CONCRETE. THE EXPERIMENTS INCLUDED CONCRETE OF 3 CEMENT CONSTANTS, 3 BRANDS OF CEMENT, AND 4 METHODS OF CONDITIONING SPECIMENS PRIOR TO TESTING. THE TEST RESULTS, WHEN ANALYZED BY STATISTICAL METHODS, INDICATE A DEFINITE LINEAR RELATIONSHIP BETWEEN THE LOGARITHM OF THE MATURITY OF THE CONCRETE IN DEGREE-HOURS AND THE RELATIVE COMPRESSIVE STRENGTH. WHEN SPECIMENS WERE TESTED AT SPACED VALUES OF MATURITY, AN EQUATION CAPABLE OF PREDICTING THE 28-DAY STRENGTH OF CONCRETE TO WITHIN ABOUT 500 PSI WAS DERIVED. PREDICTED RESULTS ARE SUITABLE FOR CONSTRUCTING ONE-SIDED CONFIDENCE LIMITS FOR QUALITY CONTROL PURPOSES. IT WAS FOUND PRACTICAL TO CONSTRUCT A NOMOGRAPH TO EXPEDITE THE COMPUTATION OF PREDICTED VALUES. A LIMITED AMOUNT OF SIMULATION WAS CONDUCTED ON 8 SETS OF TEST CYLINDERS MADE AT THE JOB SITE AND TESTED AT 23 TO 42 HOURS OF AGE. THE AVERAGE DIFFERENCE BETWEEN THE PREDICTED 28-DAY STRENGTHS AND THE ROUTINE 28-DAY TEST RESULTS WAS ABOUT 300 PSI. PRACTICAL APPLICATION OF THIS METHOD REQUIRES THAT A DEFINITE EARLY TEST PROCEDURE BE ESTABLISHED AND THAT EQUATION CONSTANTS FOR COMMONLY USED CONCRETE MIXTURES BE ESTABLISHED BY EXPERIMENT USING THIS PROCEDURE. /AUTHOR/

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/hrr/1971/370/370-003.pdf
• Supplemental Notes:
  • Sponsored by Committee on Mechanical Properties of Concrete and presented at the 50th Annual Meeting. 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:
  • Hudson, S B
  • Steele, G W
• Publication Date: 1971

Media Info

• Media Type: Digital/other
• Features: Appendices; Figures; References; Tables;
• Pagination: pp 25-35
• Monograph Title: Concrete
• Serial:
  • Highway Research Record
  • Issue Number: 370
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Concrete; Concrete tests; Forecasting; Quality control; Statistical analysis; Strength of materials
• Uncontrolled Terms: Cylinders
• Subject Areas: Data and Information Technology; Highways; Materials;

Filing Info

• Accession Number: 00214092
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Apr 23 1972 12:00AM