STATISTICAL EVALUATION OF CONCRETE STRENGTH TESTS

ADDITIONAL SOURCES OF VARIABILITY IN CONCRETE STRENGTH TESTS WERE ENUMERATED. THESE SOURCES HAD NOT BEEN MENTIONED ORIGINALLY BECAUSE THEY ALL DEAL ESSENTIALLY WITH THE INTEGRITY WITH WHICH THE SPECIMENS WERE OBTAINED AND TESTED. WHEN PRACTICALLY ALL THE TEST SPECIMENS WERE OBTAINED AND TESTED BY THE WRITER, HE WAS SATISFIED THAT THEY WERE TESTED IN ACCORDANCE WITH PROPER PROCEDURES. THE APPARENT TRIVERGENT NATURE OF THE STRENGTH REQUIREMENTS OF ASTM C94 SHOULD HAVE BEEN MENTIONED. THE METHOD OF SELECTING RANDOM SAMPLES FROM EACH CEMENT SHIPMENT IS DESCRIBED' THE CEMENT WAS PALLETIZED WITH APPROXIMATELY 60 SACKS PER PALLET, ONE PALLET FOR EACH 1,000 BAGS SHIPPED WAS SELECTED FROM THE STORAGE AREA AND THEN ONE SACK WAS SELECTED FROM EACH PALLET . EACH OF THE 5 OR 6 SACKS SO OBTAINED WAS SAMPLED BY STANDARD QUARTERING PROCEDURES. THE SAMPLES WERE THEN COMBINED AND THOROUGHLY BLENDED ON AN EQUAL WEIGHT PROPORTION BASIS TO FORM THE TEST SAMPLE. REFERENCES' STATISTICAL EVALUATION OF CONCRETE STRENGTH TESTS, ASCE PROCEEDINGS PAPER 3453, MARCH 1963.

• Supplemental Notes:
  • Vol 90, No CO2, PP51-52
• Authors:
  • Cady, P D
• Publication Date: 1964-9

Media Info

• Serial:
  • Journal of the Construction Division

Subject/Index Terms

• TRT Terms: Cement; Concrete tests; Methodology; Pallets; Randomization; Samples; Sampling; Specimens; Statistical analysis; Strength of materials
• Uncontrolled Terms: Preparation
• Old TRIS Terms: Quartering methods
• Subject Areas: Data and Information Technology; Highways; Materials;

Filing Info

• Accession Number: 00212385
• Record Type: Publication
• Files: TRIS
• Created Date: Jul 12 1994 12:00AM