Title: High-Strength Concrete Subjected to Triaxial Compression

Author(s): Farhad Ansari and Qingbin Li

Publication: Materials Journal

Volume: 95

Issue: 6

Appears on pages(s): 747-755

Keywords: compressive strength; concrete; high-strength concrete; mechanical properties; stress-strain relationship; tensile properties; triaxial stress

DOI: 10.14359/420

Date: 11/1/1998

Abstract:
Behavior of high strength concrete subjected to multiaxial states of stress has been studied. An experimental program was undertaken through which it was possible to quantitatively determine the failure surface for high strength concrete. Hence, results from this study provide the means for prediction of the failure condition for high strength concrete under combined stresses. The experimental program comprised of testing high strength concretes at three different compressive strength levels. The three strength levels included concretes with compressive strengths of 6, 10, and 15 ksi (42, 69, 103 MPa). The triaxial tests were performed on 4 x 8-in. (100 x 200-mm) cylindrical specimens. The range of confining pressures (s3) employed in the experiments ranged from 1200 to 12,000 psi (8.3 to 82 MPa). A series of uniaxial tension and compression tests were also performed in order to develop the necessary data for establishment of the failure criterion. Empirical relationships were developed for prediction of axial strength as a function of confining pressure. In general the axial strength of high strength concrete increases with increased confining pressure. However, in comparison with the normal strength concrete the effect of confining pressure on the failure strength of high strength concrete is less pronounced.