Journal
CEMENT AND CONCRETE RESEARCH
Volume 36, Issue 10, Pages 1999-2005Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2006.05.029
Keywords
temperature; stress-strain curve; compressive strength; elastic modulus
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An experimental research is performed on the complete compressive stress-strain relationship for concrete after heating to temperatures of 100-800 degrees C. All concrete specimens are phi 15 cm x 30 cm standard cylinders, made with siliceous aggregate. The heated specimens are tested at 1 month after they are cooled to room temperature. From the results of 108 specimens with two original unheated strengths, a single equation for the complete stress-strain curves of heated concrete is developed to consider the shape varying with temperature. Through the regression analysis, the relationships of the mechanical properties with temperature are proposed to fit the test results, including the residual compressive strength, peak strain and elastic modulus. Compared with the experimental curves, the proposed equation is shown to be applicable to unheated and heated concrete for different temperatures. In addition, the split-cylinder tests of 54 specimens are also carried out to study the relationship of splitting tensile strength with temperature. (C) 2006 Elsevier Ltd. All rights reserved.
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