Author(s)

E. M. Williams, S. S. Graham, S. A. Akers, P. A. Reed & T. S. Rushing

Abstract

Personnel of the Geotechnical and Structures Laboratory, US Army Engineer Research and Development Center, conducted a series of laboratory experiments to investigate the strength and constitutive property behavior of baseline ultrahigh- performance composite concrete (Cor-Tuf) with and without steel fibers. A total of 23 mechanical property tests were successfully completed for each Cor-Tuf concrete. The property tests included hydrostatic compression, unconfined compression (UC), triaxial compression (TXC), unconfined direct pull (DP), uniaxial strain, and uniaxial-strain-load/constant-volume-strain loading tests. Results of the TXC tests exhibited a continuous increase in maximum principal stress difference with increasing confining stress. A compression failure surface was developed from the TXC and the UC test results. The results for the DP tests were used to determine the unconfined tensile strength of the concretes, which was less than 10% of the unconfined compression strength. The Cor-Tuf with the steel fibers exhibits slightly greater strength with increased confining pressure than the Cor-Tuf without steel fibers. Overall, the results from all of the compression tests for both Cor-Tuf concretes were very similar. Keywords: ultra-high-performance concrete, steel fibers, high pressure mechanical response.

Keywords

ultra-high-performance concrete, steel fibers, high pressure mechanical response