Title:
Pore Structures, Permeabilities, and Compressive Strengths of Concrete at Temperatures up to 800 °C
Author(s):
Ivan Janotka and Lubomir Bagel
Publication:
Materials Journal
Volume:
99
Issue:
2
Appears on pages(s):
196-200
Keywords:
concrete; strength; temperature.
DOI:
10.14359/11713
Date:
3/1/2002
Abstract:
An experimental investigation on effects of temperatures up to 800 ºC on the strength characteristics, pore structure, and calculated permeability coefficients of concrete at the Mochovce nuclear power plant (Slovakia) is reported in this paper. Concrete specimens were manufactured in laboratory conditions using identical materials to those used at the Mochovce construction site and then subsequently exposed to selected temperatures. Test results reveal no significant changes in strength, average pore radius, or calculated permeability coefficients for tested specimens exposed to elevated temperatures up to 400 ºC. It demonstrates that the proposed calculation procedure for the permeability coefficient on the basis of the measured pore sizes using mercury intrusion porosimetry is a suitable technique for the evaluation of concrete quality. These results are as good and as useful as the measured strength and modulus of elasticity.