QUALITY CONCRETE FOR HIGHWAY CONSTRUCTION WITH CENTRAL MIXING PLANT
CENTRAL MIXED CONCRETE, DELIVERED TO JOB BY NEW AGITATED TRUCK BODIES, OFFERS GREAT OPPORTUNITY FOR FAST PLACEMENT, NEW METHODS OF QUALITY CONTROL, AND VERSATILITY IN RESPECT TO PLACING CONCRETE IN BRIDGES AND THE NUMEROUS OTHER STRUCTURES AS WELL AS THE SLAB ITSELF. THE METHOD IS FUNDAMENTALLY OLD. FIGURES WILL SHOW WORK IN OHIO DURING 1921. THE FIRST LARGE SCALE OPERATION ALONG MODERN LINES WAS THE CONCRETING ON ONE SECTION OF THE OHIO TURNPIKE IN 1954. THERE WERE TWO LARGE SCALE OPERATIONS IN 1955 AND NUMEROUS SMALLER OPERATIONS WHERE ONLY PART OF THE CONCRETE WAS MIXED. IMPROVISED PLANTS SUCH AS STATIONARY TRUCK MIXERS, AND STATIONARY PAVERS PERMITTED THE USE OF EQUIPMENT ALREADY AVAILABLE. THIS WAS AFFECTED ON THE GARDEN STATE PARKWAY WIDENING, JUNE 1955, AND ODD PARTS OF US 14 IN OHIO NEAR RAVENNA, SUCH AS BRIDGE APPROACHES, INTERSECTIONS, AND THE LIKE. THE NEED IS SHOWN FOR NEW EQUIPMENT INCLUDING A SPREADER TO CONVEY AND DEPOSIT THE CONCRETE EVENLY ACROSS A FULL 25 FOOT WIDTH OF PAVEMENT. PORTABLE, OR SEMI-PORTABLE, CONCRETE MIXING PLANTS ARE ALSO NEEDED WHICH CAN BE TRANSPORTED IN PARTS FOR RAPID TRAVEL AND ERECTION. THESE PLANTS SHOULD INCORPORATE COMPLETE FACILITIES FOR AUTOMATIC WEIGHING, RECORDING AND TESTING. IT IS PROPOSED THAT THE HEAVY MEDIA METHOD OF TESTING FOR CEMENT CONTENT BE ENLARGED TO TEST THE FIRST, MIDDLE, AND LAST PARTS OF THE CONCRETE AS DISCHARGED FROM THE CENTRAL MIXING PLANTS TO MEASURE UNIFORMITY OF MIXING. IN RESPECT TO PLACING CONCRETE IN THE SLAB A DEVICE SHOULD BE TRIED FOR CONSOLIDATING BY USING BOTH PRESSURE AND VIBRATION IN ORDER TO SUCCESSFULLY PLACE CONCRETE OF ONE INCH OR LESS SLUMP. WITH THE ADDED FLEXIBILITY AND SPEED, CENTRAL MIXED CONCRETE MAY WELL IMPROVE QUALITY AND REDUCE COST OF CONCRETE IN THE COUNTRY'S NEW HIGHWAY PROGRAM. /AUTHOR/
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Supplemental Notes:
- No 132, pp 1-10, 13 FIG, 1 APP 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:
- Maxon, Glenway
- Publication Date: 1956
Media Info
- Media Type: Digital/other
- Pagination: 10p
- Monograph Title: Concrete control and construction
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Serial:
- Highway Research Board Bulletin
- Issue Number: 132
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Compactors; Concrete construction; Concrete mixers; Concrete mixing; Concrete pavements; Concrete placing; Economics; Mixing plants; Portable equipment; Quality control; Road construction; Spreaders; Vibratory compaction
- Old TRIS Terms: Concrete central mixing plants
- Subject Areas: Construction; Economics; Highways; Vehicles and Equipment;
Filing Info
- Accession Number: 00215129
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Apr 28 1994 12:00AM