EFFECT OF VARIATIONS IN MIX DESIGN OR CURING CONDITIONS ON A PULSE VELOCITY-STRENGTH RELATIONSHIP
TESTS ON 6-BY 6-BY 30-IN. BEAMS ARE DESCRIBED. PULSE VELOCITIES WERE FIRST MEASURED THROUGH THE LENGTHS OF THE BEAMS. THE BEAMS WERE THEN TWICE BROKEN IN FLEXURE BY MID- POINT LOADING ON AN 18-IN. SPAN AND THE TWO ENDS OF THE BEAMS WERE BROKEN IN COMPRESSION AS MODIFIED 6-IN. CUBES. ONE AGGREGATE WAS USED THROUGHOUT THE SERIES. SPECIMENS WERE MADE FROM FOUR CEMENTS AND THREE WATER-CEMENT RATIOS. TESTS WERE MADE AT AGES OF 3, 7, AND 28 DAYS. SOME SPECIMENS WERE CONTINUALLY MOIST CURED FOR 7 DAYS AND THEN STORED IN AIR IN THE LABORATORY UNTIL THE TIME OF TEST. THESE WERE TESTED IN A DRY CONDITION. A THIRD GROUP, IDENTIFIED AS AIR-SOAKED, WERE MOIST CURED FOR 7 DAYS, THEN STORED IN AIR IN THE LABORATORY UNTIL 48 HR PRIOR TO TEST AND IMMERSED FOR THE FINAL 48-HR PERIOD. THESE WERE TESTED IN A WET CONDITION. THE DATA SHOW THAT FOR ANY ONE CEMENT, MIX, AND CURING CONDITION A FAIR RELATIONSHIP BETWEEN PULSE VELOCITY AND EITHER FLEXURAL OR COMPRESSIVE STRENGTH MAY BE ESTABLISHED. IN SOME CASES SUCH A RELATIONSHIP MAY BE EXTENDED TO INCLUDE MORE THAN ONE CEMENT, SEVERAL MIXES, AND ALL THREE CURING CONDITIONS. IN OTHER CASES THE RELATIONSHIP IS DISTINCTLY LIMITED TO ONE CEMENT, MIX AND CURING CONDITION. IT IS CONCLUDED THAT IN A GENERAL SENSE A RELATIONSHIP BETWEEN PULSE VELOCITY AND STRENGTH EXISTS AND MAY BE DETERMINED FOR ANY GIVEN SET OF CONDITIONS, BUT THAT ANY EFFORT TO APPLY SUCH A RELATIONSHIP TO CONCRETE OF UNKNOWN ORIGIN FOR WHICH THE RELATIONSHIP HAS NOT BEEN SPECIFICALLY DETERMINED IS LIKELY TO LEAD TO LARGE ERRORS IN STRENGTH ESTIMATION. /AUTHOR/
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Supplemental Notes:
- No 206 pp 57-63, 12 FIG, 6 REF 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
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Authors:
- Whitehurst, E A
- Publication Date: 1959
Media Info
- Monograph Title: Effects of concrete characteristics on the pulse velocity
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Serial:
- Highway Research Board Bulletin
- Issue Number: 206
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Admixtures; Beams; Compressive strength; Concrete; Concrete curing; Flexural strength; Loads; Pulses; Variables; Velocity measurement
- Uncontrolled Terms: Concrete beams; Loading; Pulse velocity tests
- Old TRIS Terms: Variations
- Subject Areas: Highways; Materials;
Filing Info
- Accession Number: 00213241
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Sep 12 1994 12:00AM