Thermal Incompatibility of Concrete Components and Thermal Properties of Carbonate Rocks

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Title: Thermal Incompatibility of Concrete Components and Thermal Properties of Carbonate Rocks

Author(s): Srdjan D. Venecanin

Publication: Materials Journal

Volume: 87

Issue: 6

Appears on pages(s): 602-607

Keywords: bridges (structures); carbonate aggregates; compressive strength; concrete durability; concretes; cracking (fracturing); deterioration; environments; limestone; temperature; thermal expansion; thermal properties; thermal stresses; Materials Research

Date: 11/1/1990

Abstract:
When concrete is exposed to temperature changes, unequal volume changes of concrete components cause cracking and reduction of durability. This phenomenon is often called thermal incompatibility of concrete components (TICC). It occurs when an aggregate with low thermal coefficient of thermal expansion (CTE) is used--and carbonate rocks often have low CTE. Carbonate rocks are often thermally nonhomogeneous, so usual methods of determining CTE are often unsuitable, since a great number of specimens must be used to obtain a dependable average value of CTE. A new method to measure CTE of nonhomogeneous rocks is proposed, which simultaneously gives results on thermal anisotropy of specimens, nonlinear relationship of strain and temperature, and residual strains after cyclic temperature changes, all of which are important in terms of TICC.