THERMAL EXPANSION CHARACTERISTICS OF HARDENED CEMENT PASTE AND OF CONCRETE
THE APPARENT THERMAL COEFFICIENT OF EXPANSION OF HARDENED, NEAT PORTLAND CEMENT VARIES WITH ITS RELATIVE HUMIDITY, OR STATE OF MOISTURE. WITH RELATIVELY YOUNG PASTES (LESS THAN ONE YEAR OLD) THE THERMAL COEFFICIENT IS LOW AT LOW RELATIVE HUMIDITIES. AS THE HUMIDITY INCREASES THE APPARENT THERMAL COEFFICIENT REACHES A MAXIMUM AT ABOUT 70 PERCENT, BUT AS THE RELATIVE HUMIDITY INCREASES BEYOND THIS, THE APPARENT COEFFICIENT AGAIN DECREASES, REACHING A MINIMUM, OR TRUE KINETIC, THERMAL COEFFICIENT AT WATER-SATURATION, OR 100 PERCENT RELATIVE HUMIDITY. THIS LAST CONDITION IS BEST ATTAINED BY VACUUM SATURATION. OLDER PASTES SHOW THE SAME THERMAL CHARACTERISTICS AS YOUNG PASTES, BUT TO A LESSER DEGREE. THE RANGE OF VARIATION OF COEFFICIENT WITH CHANGE OF RELATIVE HUMIDITY IS LESS; ALSO THE MAXIMUM COEFFICIENT APPEARS TO BE SOMEWHAT BELOW 70 PERCENT RELATIVE HUMIDITY. OTHER CAPILLARY MATERIALS POSSESSING CAPILLARY VOIDS WITHIN, OR CLOSE TO, THE RANGE IN SIZE OF PORTLAND CEMENT-GEL PORES ALSO HAVE A VARIABLE APPARENT COEFFICIENT OF EXPANSION, AND THEIR VOLUME CHANGE WITH MOISTURE CHANGE IS ALSO RELATED TO THE EXTENT OF CHANGE OF THEIR APPARENT COEFFICIENT. /AUTHOR/
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Supplemental Notes:
- Vol 30, pp 193-203, 10 FIG, 5 TAB, 8 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:
- Meyers, S L
- Publication Date: 1951
Media Info
- Media Type: Digital/other
- Monograph Title: Proceedings of the Thirtieth Annual Meeting of the Highway Research Board Held at Washington, D.C., January 9-12, 1951
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Serial:
- Highway Research Board Proceedings
- Volume: 30
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Humidity; Moisture content; Percent saturation; Portland cement; Portland cement concrete; Thermal expansion; Vacuum
- Subject Areas: Highways; Materials;
Filing Info
- Accession Number: 00213946
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Jul 25 1971 12:00AM