Pore Pressure in High-Strength Concrete at High Temperature
Long T. Phan
This paper presents results of an experimental program to study the effects of elevated temperature exposure on pore pressure buildup and potential for explosive spalling in normal strength (NSC) and high-strength concrete (HSC). Thermally-induced pore pressure and concrete temperatures, developed by exposing 100 x 200 x 200 mm HSC and NSC block specimens to 600 C at 5 C/min and 25 C/min heating rates, were measured. Experimental evidence of the complex heat-induced moisture transport process that varied with different temperature levels and significantly influenced the pore pressure and temperature developments are discussed. Pore pressure developments were shown to be directly related to this moisture transport process and had a significant influence on occurrence of explosive spalling. Effects of w/cm ratios, curing conditions, heating rates, and polypropylene (PP) fibers on pore pressure buildup and explosive spalling were quantified by measurements and described.
3rd| Performance, Innovations and Structural Implications (ConMat'05)
August 22-25, 2005
International Conference on Construction Materials