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Spalling and Mechanical Properties of High Strength Concrete at High Tempeature.


pdf icon 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.