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Component

http://onlinepubs.trb.org...rbbulletin/295/295-004.pdf

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/

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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1961

Highway Research Board Bulletin

40th Annual Meeting of the Highway Research Board

Air content; Compression tests; Concrete; Concrete mixers; Concrete mixing; Concrete pavements; Consistency; Flexural strength; Mixing; Mixing plants; Mortar; Oversize loads; Percent; Specifications; Time; Weight

Overloads

Highways; Materials

TRIS, TRB

Aug 12 1994 12:00AM

• CONSTRUCTION PROCEDURES OF SLIP-FORM PAVEMENT
• PORTLAND CEMENT CONCRETE PAVING WITH CENTRAL-MIXED CONCRETE
• SPECIFICATIONS AND CONSTRUCTION CONTROLS TO OBTAIN SMOOTH- RIDING BRIDGE DECKS