Abstract
The present recommendation defines a method for measuring the time-dependent strain in hardened concrete specimens that are either load-free or are subjected to a uniform compressive force kept constant over a long period. It states the definitions of autogenous shrinkage and drying shrinkage, basic creep and drying creep, instantaneous strain at a given age, and recovery. It gives the specifications for testing and measuring devices and describes, in an appendix, three types of apparatus for creep tests. The present recommendation applies to the case of concretes containing light, normal, and heavy aggregates, when the maximum size of these aggregates does not exceed 50 mm.
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References
RILEM/CPC 12 Recommendation, ‘Strain Measurement under Compressive Loading—Conventional Calculation of Creep’, 1st Edition, June 1983.
ASTM Standard Test Method ‘Creep of Concrete in Compression’, designation: C512-87, July 1987.
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The draft of this document has been prepared by the members of Subcommittee 4: Standardized Test Methods for Creep and Shrinkage: Paul Acker (Chairman), Z.P. Bažant, J. C. Chern, C. Huet, F.H. Wittmann. Also consulted were: F. Alou, G. Fagerlund, T.C. Hansen, M. Mamillan, P. Schwesinger, F. Ulm.
The text presented hereunder is a draft for general consideration. Comments should be sent to the TC Chairman, Prof. Zdeněk P. Bažant, Northwestern University, WP Murphy Professor of Civil Engineering, 2145 Sheridan Road, A131, Evanston, IL 60208, USA, Fax: +1 847 467 1078, e-mail: z-bazant@nwu.edu before April 1, 1999.
TC MEMBERSHIP:Chairman: Zdeněk P. Bažant, USA;Secretary: Bernard Espion, Belgium;Members: Paul Acker, France; Luis Agullo, Spain; Michel Auperin, France; Ignacio Carol, Spain; Domingo J. Carreira, USA; Jose M. R. Catarino, Portugal; Jenn-Chuan Chern, Taiwan; Mario A. Chiorino, Italy; John W. Dougill, UK; Christian Huet, Switzerland; Terje Kanstad, Norway; Jin-Keun Kim, Korea; Vladimir Kristek, Czech Republic; Harold S. Muller, Germany; Byung Hwan Oh, Korea; Josko Ozbolt, Germany; Stuart Reid, Australia; H. W. Reinhardt, Germany; Peter Schwesinger, Germany; Bretislav Teply, Czech Republic; Heinrich Trost, Germany; Tatsuya Tsubaki, Japan; R. F. Warner, Australia; Folker H. Wittmann, Switzerland; Yunping Xi, USA; J. F. Young, USA.
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Subcommittee 4: Standardized Test Methods for Creep and Shrinkage. Measurement of time-dependent strains of concrete. Mat. Struct. 31, 507–512 (1998). https://doi.org/10.1007/BF02481530
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DOI: https://doi.org/10.1007/BF02481530