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Heating, Spalling Characteristics and Residual Properties of High Performance Concrete.

pdf icon Heating, Spalling Characteristics and Residual Properties of High Performance Concrete. (1251 K)
Phan, L. T.; Lawson, J. R.; Davis, F. L.

NISTIR 6588; November 2000.

U.S./Japan Government Cooperative Program on Natural Resources (UJNR). Fire Research and Safety. 15th Joint Panel Meeting. Volume 2. Proceedings. March 1-7, 2000, San Antonio, TX, Bryner, S. L., Editor(s), 389-398 pp, 2000.

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fire safety; fire research; high performance concrete; heating; spalling; mechanical properties; test methods; exposure


This paper describes results of NIST's experimental program to study effects of elevated temperature exposure on residual mechanical properties of high-performance concrete (HPC). The cylindrical test specimens were made from four mixtures with water-to-cementitious material ratio (w/cm) ranging from 0.22 to 0.57, and room-temperature compressive strength ranging from 51 MPa to 93 MPa. Two of the mixtures contained silica fume. The specimens were heated to an interior temperature of 450 deg C, at a heating rate of 5 deg C/min. Elastic modulus and compressive strength were measured after cooling to room temperature. Results indicate that, within the range of compressive strength examined (51 MPa to 93 MPa), HPCs with higher original strength (lower w/cm) and with silica fume have higher relative residual strength after elevated temperature exposure than those with lower original strength (higher w/cm) and without silica fume. The differences in modulus of elasticity are less significant. However, the potential for explosive spalling increased in HPC specimens with lower w/cm and silica fume.