Title:
Effect of Transient High Temperature on High-Strength Concrete
Author(s):
Carlos Castillo and A. J. DurraniI
Publication:
Materials Journal
Volume:
87
Issue:
1
Appears on pages(s):
47-53
Keywords:
compressive strength; high strength concretes; high temperature; high-temperature tests; modulus of elasticity; plasticizers; research; stress-strain relationships; Materials Research
DOI:
10.14359/2356
Date:
1/1/1990
Abstract:
The effect of transient high temperature on strength and load-deformation behavior of high-strength concrete was investigated. The concrete strength varied between 4500 and 12,900 psi (31.1 and 89 MPa) and the temperature exposure was in the range of 23 to 800 C (73 to 1472 F). The presence of loads in real structures was simulated by preloading the test specimens before exposure to elevated temperature. Exposure to temperatures in the range of 100 to 300 C (212 to 572 F) decreased the compressive strength of high-strength concrete by 15 to 20 percent. At temperatures in the range of 400 to 800 C (752 to 1472 F), the compressive strength of concrete decreased to about 30 percent of its strength at room temperature. Approximately one-third of the preloaded specimens failed in an explosive manner during the heating period. The remaining specimens, however, showed a smaller loss of strength compared to that of unstressed specimens. The exposure to high temperature also decreased the modulus of elasticity of concrete regardless of the preload condition and the strength of concrete.