AUTOGENOUS ACCELERATED CURING OF CONCRETE CYLINDERS, PART V-ASTM COOPERATIVE TESTING PROGRAM WITH ADDITIONAL EMPHASIS ON THE INFLUENCE OF CONTAINER AND STORAGE CHARACTERISTICS

THE INFORMATION FROM TWO INVESTIGATIONS ON REFINING ACCELERATED METHODS FOR STANDARDIZATION IS PRESENTED WITH DATA FROM LIMITED SCOPE STUDIES OF CONTAINERS AND STORAGE CONDITIONS. THE CURING PROCEDURES EVALUATED WERE: (1) 95F WATER BATH IMMEDIATELY FOR 24 HOURS - PROCEDURE A, (2) 212F WATER BATH AFTER 23 HOURS FOR 3-1/2 HOURS - PROCEDURE B, (3) 212F WATER BATH AFTER INITIAL SET (APPROXIMATELY 4-6 HOURS) FOR APPROXIMATELY 15 HOURS - PROCEDURE C, AND (4) AUTOGENOUS CURING IMMEDIATELY IN SPECIAL CONTAINERS - PROCEDURE D. BASED UPON THE DATA DEVELOPED, THE FOLLOWING CONCLUSIONS ARE DRAWN: (1) EACH OF THE FOUR ACCELERATED PROCEDURES IS CAPABLE OF PREDICTING STRENGTHS AT LATER AGES WITH ACCURACY EQUIVALENT TO THAT CURRENTLY ACHIEVED WITH MOIST CURING. (2) PROCEDURE A GIVES THE LOWEST STRENGTH RATIOS WHILE PROCEDURES C AND D GIVE THE HIGHEST RATIOS. PROCEDURE B IS INTERMEDIATE. (3) THE VARIABILITY OF TEST RESULTS FROM ACCELERATED TESTS IS OF THE SAME ORDER AS THAT FROM CONVENTIONAL PROCEDURES. (4) THE FOUR PROCEDURES ARE COMPARATIVELY INSENSITIVE TO THE PRESENCE OF RETARDING ADMIXTURES AT NORMAL DOSAGES. PROCEDURE C APPEARED TO BE AFFECTED BY THE PRESENCE OF THE ADMIXTURE MORE THAN BY CHANGES IN CEMENT TYPE. (5) DIFFERENCES IN RESULTS AMONG THE PROCEDURES AND THE INFLUENCE OF OTHER FACTORS SUCH AS INITIAL MIXTURE TEMPERATURES ARE GREATEST FOR MIXTURES AT LOWER INITIAL TEMPERATURES AND WITH A LOW POTENTIAL FOR HEAT EVOLUTION. (6) VARIATIONS OF INITIAL MIXTURE TEMPERATURES ABOVE 60F DO NOT SIGNIFICANTLY INFLUENCE RESULTS. (7) FOR THE AUTOGENOUS PROCEDURE, D, A FAIRLY WIDE RANGE OF HEAT RETENTION CHARACTERISTICS BETWEEN CONTAINERS TYPES HAD NO SIGNIFICANT INFLUENCE ON STRENGTH RATIOS. (8) MINOR VARIATIONS IN STORAGE CONDITIONS AND/OR LENGTHS OF CURING DO NOT SIGNIFICANTLY AFFECT RESULTS FOR EITHER PROCEDURE B OR D, ALTHOUGH PROCEDURE B IS SLIGHTLY MORE INFLUENCED THAN PROCEDURE D. /AUTHOR/

  • Record URL:
  • Supplemental Notes:
    • Vhrc 70-r36, 34 PP, 4 FIG, 11 TAB, 9 REF, 1 APP
  • Corporate Authors:

    Virginia Highway Research Council

    Charlottesville, VA  United States 
  • Authors:
    • Newlon, H H
  • Publication Date: 1971-4

Subject/Index Terms

Filing Info

  • Accession Number: 00214040
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 18 1971 12:00AM