The Interaction of Thermal Stress and Concrete Creep


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Title: The Interaction of Thermal Stress and Concrete Creep

Author(s): S.K. Hirata, D.M. Smith and M.I. Hammons

Publication: Special Publication

Volume: 135


Appears on pages(s): 37-50

Keywords: Cracking (fracturing); creep properties; finite element analyses; fly ash; mechanical properties; mass concrete; models; structural analysis; thermal properties; thermal stresses

Date: 12/1/1992

Thermal-related cracking in mass concrete structures can significantly increase maintenance and repair costs and decrease service life. Incremental construction thermal-stress analyses performed on a critical section of a navigation lock chamber monolith provided the basis for a study of the relationship between creep of concrete and thermal stresses during construction. Two concrete mixtures with high proportions of fly ash to portland cement (up to 50 percent fly ash) were selected for a full complement of thermal and mechanical properties testing at ages from 16 hours to 14 days. A general purpose heat-transfer an structural analysis finite element code was used in the analyses. The code incorporated a time-dependent material model as an integral part of the analysis effort. Material and mechanical properties test results were incorporated into the analyses for each mixture.