5. Conclusions

Contrary to popular belief, the surface of concrete is far from inert. In addition to mechanisms, such as hydration, induced by the very nature of cement, the extreme surface of concrete is a site of particular exchange between the cementitious matrix and its environment (water, ionic compounds, gases and micro-organisms).

The kinetics of all these reactions involve various time periods, depending on the reaction under consideration: from a few hours for hydration of the main mineral phases at the extreme surface, to a few days for phenomena such as efflorescence, and up to several months or years for phenomena linked to carbonation, leaching or the growth of micro-organisms.

The reactivity of concrete surfaces should therefore not be considered negligible. Indeed, even if certain phenomena seem to affect only the aesthetics of concrete...

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page Protective coatings for concrete

Glossary

Bibliography

(1) - VERNET (C.), LUKASIK (J.), PRAT (E.) - Nanostructure, porosity, permeability, and diffusivity of Ultra high performance concretes (UHPC). – - Proceedings of the International Symposium on High Performance Concrete and Reactive Powder Concrete, Edited by AITCIN (P.C.) and DELAGRAVE (Y.), p. 17 (1998).
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Standards and norms

ISO Acoustique : méthode de calcul du niveau d'isotonie. - ISO 532 1975 ISO - 1975
AFNOR Tests for fresh concrete – Part 5: Impact table spread test - NF EN 12350-5 AFNOR - 2005
AFNOR Clay roof tiles for discontinuous laying – Determining physical characteristics – Part 1: Impermeability test - NF EN 539-1 AFNOR - 2006
ISO Fine ceramics (advanced ceramics, advanced technical ceramics) – Test method...