Acid Corrosion of Plain and Reinforced Concrete Sewage Systems
Publication: Journal of Materials in Civil Engineering
Volume 25, Issue 9
Abstract
The infrastructure of concrete sewage systems is affected notably by biogenic sulfuric acid attack, which causes rapid deterioration of each of its components. To provide a better understanding of this mechanism of damage, this paper reports on research carried out to study the response of the cementitious concrete matrix and the reinforcement steel under the attack of sulfuric acid. Concrete industrial pipes were cast using ordinary portland cement and pulverized fly ash, and specimens obtained from the mixes were left for several cycles in a solution of sulfuric acid at different pH. Experiments were carried out to assess the loss of weight and the electrical corrosion potential. Results showed that sulfuric acid attack can be considered a surface phenomenon, in which the acid attack destroys the cover of concrete before it reaches the reinforcement.
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Acknowledgments
The authors would like to thank the guidance of Professor José Gabriel Gómez Cortes and the support given by Manufacturas de Cemento–TITAN S.A.
References
ASTM. (1991). “Standard test method for half-cell potentials of uncoated reinforcing steel in concrete.” C876, West Conshohocken, PA.
Fattuhi, N. I., and Hughes, B. P. (1988). “Ordinary portland cement mixes with selected admixtures subjected to sulphuric acid attack.” Mater. J., 85(6), 512–518.
Tamimi, A. K. (1997). “High-performance concrete mix for an optimum protection in acidic conditions.” Mater. Struct., 30(3), 188–191.
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© 2013 American Society of Civil Engineers.
History
Received: Sep 27, 2011
Accepted: Jul 27, 2012
Published online: Aug 25, 2012
Discussion open until: Jan 25, 2013
Published in print: Sep 1, 2013
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