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

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Conference12th International Congress on the Chemistry of Cement: 08 July 2007, Montréal, QC.
Pages112; # of pages: 12
AbstractThis 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.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number49265
NPARC number20377208
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Record identifier23d92feb-4b0d-481f-a6ab-ee158bfa4ad2
Record created2012-07-24
Record modified2016-05-09
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