High Strength Concrete at High Temperature

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Title: High Strength Concrete at High Temperature

Author(s): L.T. Phan

Publication: Special Publication

Volume: 255

Issue:

Appears on pages(s): 1-22

Keywords: elevated temperatures; explosive spalling; high-strength concrete; polypropylene fibers; pore pressure

Date: 10/1/2008

Abstract:
Effects of elevated temperature exposure and various factors, including water-to-cementitious material ratios (w/cm), curing conditions, heating rates, test methods, and polypropylene (PP) fibers, on (1) pore pressure buildup and potential for explosive spalling and on (2) degradation of mechanical properties in normal-strength (NSC) and high-strength concrete (HSC) are presented. Degradations of mechanical properties were measured using 100 x 200 mm cylinders, heated to temperatures of up to 600 °C at 5 °C/min, and compared with results of other studies and existing codes. Pore pressures were measured using 100 x 200 x 200 mm blocks, heated to 600 °C at 5 °C/min and 25 °C/min. Experimental evidences of the complex, temperature-dependant moisture transport process that significantly influenced pore pressure and temperature developments are described.