Measuring early-age coefficient of thermal expansion in high-performance concrete

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ConferenceInternational RILEM Conference on Volume Changes of Hardening Concrete: Testing and Mitigation: 20 August 2006, Lyngby, Denmark
Pages110; # of pages: 10
Subjectearly age, thermal expansion, high-performance concrete, test method; High performance / High strength concrete
AbstractThis paper presents an experimental approach to determine the coefficient of thermal expansion of concrete at early age, in which a group of three sealed concrete prisms (75x75x295 mm3) are subjected to 25-30°C temperature cycles in an environmental chamber from set time to an age of at least seven days. The concrete deformation is measured with high-precision displacement sensors and the temperature is measured by thermocouples embedded in the concrete prisms. The coefficient of thermal expansion is determined as a function of time by direct calculation on the measured data.For the high-performance concrete used in this study, it was found that the coefficient of thermal expansion decreased towards a minimum value of 6x10-6/°C one day after the setting of concrete, and then increased linearly until a more stable value of 8x10-6/°C was reached at the age of 4 days.
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AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number45428
NPARC number20377924
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Record identifier526a1044-7058-4a1b-9f29-aad032508a6b
Record created2012-07-24
Record modified2016-05-09
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