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New test method for determining coefficient of thermal expansion of high-performance concrete at early age

From National Research Council Canada

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Affiliation
  1. National Research Council of Canada. NRC Institute for Research in Construction
FormatText, Article
Conference12th International Congress on the Chemistry of Cement: 8 July 2007, Montréal, QC.
SubjectConcrete
Abstract
This paper presents a new experimental approach to determine the coefficient of thermal expansion of concrete at early age, in which sealed concrete prisms (75x75x295mm) are subjected to temperature cycles from 25 to 30°C in an environmental chamber from the time of setting to seven days. The entire test apparatus, including moulds and sensors, was carefully temperature-calibrated to obtain highly accurate measurements. A new calculation method is proposed to eliminate autogenous shrinkage from the measurements before the coefficient of thermal expansion is determined from the thermal deformation obtained as a function of time. For the high-performance concretes tested in this study (with and without internal curing), it was found that the coefficient of thermal expansion decreased towards a minimum value of 8 x 10-6/°C one day after the setting of concrete, and increased gradually up to a value of 10.5 x 10-6/°C at 7 days. The increased concrete moisture due to internal curing did not appear to affect the coefficient of thermal expansion.
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  • 12th International Congress on the Chemistry of Cement [Proceedings] (8 July 2007): 1–12.
LanguageEnglish
Peer reviewedYes
NRC numberNRCC 49265
NRC-IRC-18382
NPARC number20377208
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Record identifier23d92feb-4b0d-481f-a6ab-ee158bfa4ad2
Record created2012-07-24
Record modified2020-05-10
Date modified: