Title:
Influence of Compressive Stress on the Permeability of Concrete
Author(s):
T. W. Bremner, T. A. Holm, and J. M. McInerney
Publication:
Symposium Paper
Volume:
136
Issue:
Appears on pages(s):
345-356
Keywords:
compression; concrete; cylinders; lightweight aggregate concretes; nitrogen; permeability; stresses; General
DOI:
10.14359/4269
Date:
1/1/1993
Abstract:
The effect of stress on the nitrogen gas permeability of structural lightweight concrete was determined using cylindrical hollow concrete specimens loaded in axial compression at the same time that a nitrogen pressure differential was maintained across the cylinder wall. The nitrogen gas flow rate across the cylinder wall was noted and concrete permeability was measuredas the load increased. Flow rates tended to remain constant up to a critical stress corresponding to the onset of unstable crack propagation, at which time the flow rate increased rapidly. Rapid increases in permeability occurred at lower levels of applied stress-to-strength ratio with normal weight concrete than with lightweight concrete.