Spalling and Mechanical Properties of High Strength Concrete at High Tempeature.
Spalling and Mechanical Properties of High Strength
Concrete at High Tempeature.
(6255 K)
Phan, L. T.
Volume 2;
Concrete Under Severe Conditions: Environment and
Loading (CONSECA '07). Volume 2. 5th (Fifth)
International Conference. Proceedings. June 4-6, 2007,
Tours, France, Toutlemonde, F.; Sakai, K.; Gjorv, O. E.;
Banthia, N., Editor(s)(s), 1595-1608 pp, 2007.
Keywords:
concretes; spalling; mechanical properties; high
temperature; curing; heating rates; test methods;
polypropylene; fibers; degradation; exposure
Abstract:
Effects of elevated ternpemture exposure and various
factors, including water-to-cementitious materials
ratios (w/cm), curing conditions, heating rates, test
methods, and polypropylene (PP) fibers, on (1) pore
pressure buildup and potential for explosivc spalling
and on (2) degradation of mechanical properties in
normal strength (NSC) and high-strength concrete (HSC)
arc presented. Degradations of mechanical propctiies
were measured using 100 x 200 mm cylinders, heated to
temperatures of up to 600 DGC at 5 DGC/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 DGC at 5 DGC/min and 25 DGC/min. Experimental
evidences of the complex, temperature-dependant moisture
transport process which significantly influenced pore
pressure and temperature developments are described.
