Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

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.
Proceedings Title
3rd| Performance, Innovations and Structural Implications (ConMat'05)
Conference Dates
August 22-25, 2005
Conference Location
Vancouver, CA
Conference Title
International Conference on Construction Materials


elevated temperature, explosive spalling, high-strength concrete, polypropylene fiber, pore pressure


Phan, L. (2005), Pore Pressure in High-Strength Concrete at High Temperature, 3rd| Performance, Innovations and Structural Implications (ConMat'05), Vancouver, CA (Accessed July 15, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created August 1, 2005, Updated February 19, 2017