Document Type


Date of Award

Fall 1-31-1995

Degree Name

Master of Science in Civil Engineering - (M.S.)


Civil and Environmental Engineering

First Advisor

C.T. Thomas Hsu

Second Advisor

William R. Spillers

Third Advisor

Methi Wecharatana


Due to the recent development of high strength concrete in engineering and construction, it has become more important to study the behavior of materials in structures.

No results have been previously published in the literature regarding the influence of aspect ratio in plain high strength concrete cylinders on stress-strain behavior under uniaxial compression.Thus at present study, compression tests were conducted on 3x6 in., 3x9 in., and 3x12 in. plain high strength concrete cylinders to study their stress-strain behavior. Plain normal strength concrete cylinders were also tested and used for comparative study.

Based on the present investigations, attempting to obtain a complete stress- strain curve for plain high strength concrete cylinders with the length to diameter ratio equal to or larger than three ( fc'>12,000 psi ) with axial strain control is impossible. It can be concluded that the descending branch of a stress-strain curve of high strength concrete(fc' > 12,000 psi, with 1/d> or =3)can no longer be treated as a material property; rather, it may be treated as a structural property.