APPARATUS AND INSTRUMENTATION FOR CREEP AND SHRINKAGE STUDIES
LONGER CONCRETE BRIDGE SPANS HAVE BECOME FEASIBLE DURING THE PAST 2 DECADES AS A RESULT OF INCREASED PERMISSIBLE WORKING STRESSES, BY DEVELOPING STRUCTURAL CONTINUITY THROUGH COMPOSITE CONSTRUCTION AND BY PRESTRESSING. AS A RESULT OF THESE TECHNOLOGICAL CHANGES, THE PROBLEM OF VOLUME CHANGES RESULTING FROM CREEP AND SHRINKAGE OF CONCRETE HAVE BECOME IMPORTANT. THE NATURE OF CREEP AND SHRINKAGE AND THE EFFECT OF THESE VOLUME CHANGES ON DEFLECTION AND STRENGTH OF REINFORCED CONCRETE BRIDGES ARE BEING INVESTIGATED FOR USE IN DESIGN CRITERIA TO PREDICT AND CONTROL DEFLECTIONS. INFORMATION IS BEING OBTAINED ON THE EFFECT OF VARIATION OF THE CONCRETE CONSTITUTENTS, THE INTENSITY AND DURATION OF LOAD, THE ENVIRONMENT, AND THE GEOMETRY OF THE SPECIMENS. THE VARIABLES SELECTED FOR CONSIDERATION WERE' SIZE, SHAPE, LENGTH, STRESS INTENSITY, CURING CONDITIONS, WATER-CEMENT RATIO, TYPE OF AGGREGATE, MIX PROPORTIONS /GRADATION, CONSISTENCY, ADMIXTURES/, TIME OF LOAD APPLICATION, ENVIRONMENTAL CONDITIONS /TEMPERATURE, HUMIDITY/, AND REINFORCEMENT /NORMAL, PRESTRESSED/. THE VOLUME CHANGES CAUSED BY CREEP AND SHRINKAGE ARE MEASURED IN TERMS OF LATERAL AND LONGITUDINAL STRAIN. THE EQUIPMENT USED IN THE LABORATORY TO OBTAIN THIS INFORMATION INCLUDES' A HYDRAULIC LOADING SYSTEM, A SPRING MEASURING DEVICE, AND A STRAIN MEASURING DEVICE, AND A MECHANICAL COMPRESSOMETER TO MEASURE THE ELASTIC PROPERTIES DURING LOADING.
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Supplemental Notes:
- 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:
- Meyers, Bernard L
- Pauw, Adrian
- Publication Date: 1963
Media Info
- Media Type: Digital/other
- Features: Figures; References; Tables;
- Pagination: pp 1-18
- Monograph Title: Bridge design, analysis and costs
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Serial:
- Highway Research Record
- Issue Number: 34
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Admixtures; Aggregate gradation; Aggregates; Bridge superstructures; Composite construction; Concrete bridges; Concrete curing; Consistency; Control; Crash investigation; Creep; Deflection; Design; Humidity; Laboratory tests; Length; Loads; Mixtures; Prestressed concrete; Reinforced concrete bridges; Shape; Shrinkage; Size; Stresses; Studies; Temperature; Water cement ratio
- Uncontrolled Terms: Bridge spans; Design criteria; Loading
- Old TRIS Terms: Aggregate characteristics; Gradation
- Subject Areas: Bridges and other structures; Design; Geotechnology; Highways; Materials; Safety and Human Factors;
Filing Info
- Accession Number: 00207692
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Oct 28 1994 12:00AM