Heating, Spalling Characteristics and Residual Properties of High Performance Concrete.
Heating, Spalling Characteristics and Residual
Properties of High Performance Concrete.
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,
Available from: National Technical Information Service
(NTIS), Technology Administration, U.S. Department of
Commerce, Springfield, VA 22161.
1-800-553-6847 or 703-605-6000;
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fire safety; fire research; high performance concrete;
heating; spalling; mechanical properties; test methods;
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.