Behavior of High-Performance Concrete Subjected to Biaxial Tension-Compression Stresses


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Title: Behavior of High-Performance Concrete Subjected to Biaxial Tension-Compression Stresses

Author(s): J. M. Calixto

Publication: Special Publication

Volume: 207


Appears on pages(s): 1-14

Keywords: behavior; biaxial tension-compression stresses; high-performance concrete; strength

Date: 10/7/2002

The results of an experimental investigation on the behavior of high-performance concrete subjected to biaxial tension-compression stresses are presented. Short-term static tests were performed on 125 mm square by 12.5 mm thick plates. Strain controlled tests were executed in a biaxial testing machine constructed at the University of Texas. The primary studied variables were the discontinuity and the ultimate stress levels at each stress ratio. Results indicated that even small amounts of tensile stress reduced the ultimate compressive strength of the specimens substantially. The failure mode of the plate specimens fell basically into one category: tensile splitting in a plane or planes perpendicular to the direction of the principal tensile strain. The failure surface contained both fractures through coarse aggregate and mortar. These results suggest that the failure criteria for high-performance concrete, under biaxial tension-compression, is a limiting value for the tensile strain. The magnitude of the failure tensile strains is not constant, but increases with the degree of compression.