Materials and Structures

, Volume 32, Issue 8, pp 606–610 | Cite as

Wet deposition studies of hydraulic mortars

  • S. Martínez-Ramírez
  • G. E. Thompson
Technical Reports


Cement mortars and lime-pozzolan mortars have been exposed to wet/drying cycling of ‘acid rain’ solution, using realistic presentation rates, to simulate outdoor conditions. Cement type, water/cement ratio, and curing temperature were also examined. Form the pH of run-off solution, it is evident that reaction between the mortar and the ‘acid rain’ proceeds over the exposure period, with significant weight increases for the cement mortars and little influence of curing temperature for lime-pozzolan mortars. Exposure of the cement mortar gives to significant calcium loss to run-off and is also associated with retained souuble stalts; these results from the presence of free hydrated lime in the mortar. Conversely, lime-pozzolan mortars, associated with a clacium carbonate compounds, reveal comparatively reduced calcium loss,i.e by about one-tenth that of cement mortar.


Silica Fume Acid Rain Soluble Salt Cement Mortar Pozzolanic Reaction 
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Nous avons exposé plusieurs mortiers de ciment et pouzzolane, conservés dans des enceintes climatiques, à des cycles d'humidité et de séchage, à l'action d'une pluie acide, destinée à simuler les conditions extérieures. On a étudié l'influence du type de mortier, du rapport eau/ciment et de la température de la cure. Les valeurs du pH de l'eau de lavage indiquent que la réaction entre le mortier et la pluie acide produite pendant tout le temps d'exposition, est plus grande pour les mortiers de ciment, et que la température à laquelle les mortiers à la chaux ont été conservés a une incidence faible. Dans le cas des mortiers de ciment, on a observé une grande concentration de calcium, dans le liquide résultant du lavage, dû à la présence de chaux libre hydratée dans ces mortiers. À l'inverse, les mortiers à base de chaux et de pouzzolane présentent une perte en chaux de l'ordre du dixième de celle constatée pour les mortiers de ciment.


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Copyright information

© RILEM 1999

Authors and Affiliations

  • S. Martínez-Ramírez
    • 1
  • G. E. Thompson
    • 1
  1. 1.Corrosion and Protection centre (UMIST)ManchesterUK

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