- Author
- Brown, P. W. | Clifton, J. R.
- Title
- Mechanisms of Deterioration in Cement-Based Materials and in Lime Mortar.
- Coporate
- National Bureau of Standards, Gaithersburg, MD
- Journal
- Durability of Building Materials, Vol. 5, 1988,
- Keywords
- cements | air pollution | failure | durability | building materials
- Abstract
- The possible deterioration processes in lime mortar and in cement-based materials are analyzed in terms of the responses of the constituents of these materials to air pollutants. The air pollutants considered are CO2, SO2, and NOx. The nature of possible chemical reactions between these pollutants and lime or cement are discussed. The factors which may limit the rate of deterioration are appraised. The effects of these reactions on durability are considered. The objective of this paper is to consider the possible deterioration processes in lime mortar and in cement-based materials as a result of exposure to three common atmospheric pollutants, CO2, SO2, and NOx. Emphasis is placed on portland cement-based materials. CO2 is considered as an atmospheric pollutant because of its elevated concentrations in urban microenvironments and because of its synergism with sulfate in affecting concrete durability.