Abstract
The results are presented of on-site temperature and strain monitoring of columns made with high-performance concrete at an early age. Two pairs of circular reinforced concrete columns made of 80 MPa concrete were instrumented with the aid of vibrating wire extensometers. One of these columns was active. The other was never loaded and was used as a mock column. The strains in the concrete and in the embedded steel along with the internal temperatures as well as the ambient temperature and relative humidity, were recorded. The results show that the concrete is subjected to strains and stresses during the first 3 days due to thermal gradient and different thermal behavior of concrete and steel. It was found also that the coefficient of thermal expansion of early-age concrete is substantially higher than that of hardened concrete.
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