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Degradation of lime-pozzolan mortar exposed to dry deposition of SO2 pollutant gas: Influence of curring temperature

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Abstract

The reaction of lime-pozzolan mortars with SO2 gaseous pollutant using laboratory exposure chambers, with realistic presentation rates of pollutants, has been examined. Two different curing temperatures were used in order to promote microstructural alteration in the lime-pozzolan mortars. However, independent of curing temperature, the calcium aluminate hydrated phase formed in the hydration reaction of the pozzolan mortar was C3AS2H2.

For dry deposition of SO2 pollutant gas, the important roles of water and water plus oxidant in increasing loss of calcium from the carbonate component in the mortar are revealed, with little influence on the processes of the curing temperature of mortar. For the lime-pozzolan mortars exposed to SO2 in the additional presence of oxidant and water, the extent of chemical reaction of the mortar with the low pH surface water was about 80 times greater than that in the presence of SO2 alone.

Résumé

On a étudié la réaction des mortiers à base de chaux-pouzzolane en présence de SO2 dans des enceintes de laboratoire sous atmosphère gazeuse utilisant des taux réels de gaz polluant. Pour caractériser la modification des mortiers, ceux-ci ont été vieillis à deux températures différentes. Cependant, indépendamment de la température de cure, la réaction d'hydratation du mortier conduit à la formation du même aluminate de calcium de formule C3AS2H2. Dans le processus de déposition du SO2, on a observé que l'eau et surtout l'eau avec l'oxydant augmentent la perte de calcium provenant du composant carbonaté du mortier. La température de vieillissement a une faible influence dans le processus. Pour les mortiers exposés au SO2 en présence d'oxydant et d'eau, l'importance de la réaction chimique du mortier avec une eau de surface de faible pH, est de l'ordre de 80 fois plus grande que celle en présence de SO2 seul.

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Authors and Affiliations

  1. Corrosion and Protection Centre (UMIST), P.O. Box 88, M60 1QD, Manchester, (U.K.)

    S. Martinez-Ramirez & G. E. Thompson

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  1. S. Martinez-Ramirez
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  2. G. E. Thompson
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Martinez-Ramirez, S., Thompson, G.E. Degradation of lime-pozzolan mortar exposed to dry deposition of SO2 pollutant gas: Influence of curring temperature. Mat. Struct. 32, 377–382 (1999). https://doi.org/10.1007/BF02479630

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  • DOI: https://doi.org/10.1007/BF02479630

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