EFFECT OF MIXING TIME AND OVERLOAD ON CONCRETE PRODUCED BY STATIONARY MIXERS
THIS PAPER COVERS TESTS MADE IN CONJUNCTION WITH THE BUREAU OF PUBLIC ROADS ON TWO CONCRETE PAVING PROJECTS TO DETERMINE THE MINIMUM TIME OF MIXING REQUIRED BY STATIONARY MIXERS, USED TO MIX CONCRETE FOR AGITATING OR NON-AGITATING DELIVERY, TO PREPARE WELL-MIXED AND UNIFORM CONCRETE, AND TO DETERMINE THE AMOUNT OF OVERLOAD THAT CAN BE PERMITTED. TWO MIXERS WERE USED IN THE TESTS, ONE A 210 S, THE OTHER A 254 S. MIXING TIMES WERE 150, 120, 90, 75 AND 60 SECONDS, WITH NO OVERLOAD AND WITH A 10 PERCENT OVERLOAD. TESTS WERE MADE TO DETERMINE COMPRESSIVE AND FLEXURAL STRENGTH, CONSISTENCY, AIR CONTENT, UNIT WEIGHT AND PERCENTAGE OF MORTAR IN THE MIX (USING WASHOUT). BASED ON THE RESULTS OBTAINED, THE OHIO DEPARTMENT OF HIGHWAYS HAS CHANGED ITS SPECIFICATIONS FOR CENTRAL-MIX CONCRETE TO 1 1/2-MIN MIXING TIME WITH AN ALLOWABLE 10 PERCENT OVERLOAD. /AUTHOR/
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Supplemental Notes:
- No 295, pp 26-37, 11 FIG, 6 TAB 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:
- Barbee, J F
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Conference:
- 40th Annual Meeting of the Highway Research Board
- Location: Washington DC, United States
- Date: 1961-1-9 to 1961-1-13
- Publication Date: 1961
Media Info
- Monograph Title: Concrete mixing and paving
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Serial:
- Highway Research Board Bulletin
- Issue Number: 295
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Air content; Compression tests; Concrete; Concrete mixers; Concrete mixing; Concrete pavements; Consistency; Flexural strength; Mixing; Mixing plants; Mortar; Oversize loads; Percent; Specifications; Time; Weight
- Uncontrolled Terms: Overloads
- Old TRIS Terms: Compressive strength tests; Concrete central mixing plants; Concrete consistency; Mixing time; Unit weight
- Subject Areas: Highways; Materials;
Filing Info
- Accession Number: 00213197
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Aug 12 1994 12:00AM