DETERIORATION OF LONG SERVING CEMENT BASED SANDCRETE STRUCTURES IN NIGERIA
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Published:2002
J O Odigure, 2002. "DETERIORATION OF LONG SERVING CEMENT BASED SANDCRETE STRUCTURES IN NIGERIA", Challenges of Concrete Construction: Volume 6, Concrete for Extreme Conditions: Proceedings of the International Conference held at the University of Dundee, Scotland, UK on 9–11 September 2002, Ravindra K. Dhir, Michael J. McCarthy, Moray D. Newlands
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The fall in standard of the Nigerian economy, starting from the mid 1980s, has encouraged massive import of second hand goods, most especially industrial machines, cars, motorcycles, etc. It is a well-known fact that the majority of these are very inefficient and produce lot of pollutants (Cl−, SO2, CO2, CO, NxOy, etc) particularly as a result of incomplete fuel combustion. The presence of these pollutants has contributed not only to the depreciation of the peoples' quality of life but also to the degradation of cement based structures' physiochemical, mechanical and aesthetic qualities. This paper is aimed at developing a deterministic model, based on a mechanism of cement corrosion, to predict the deterioration of cement-based structures in Nigeria. The deterministic model equation developed is only used for a given depth of the sandcrete block. It does not represent the relationship between the concentration of pollutant CA and depth of penetration in the entire block volume. Variation in the type of pollutant and possible reaction, including leaching must also be considered in order to develop a more generic model.
INTRODUCTION
MATHEMATICAL MODELLING
EXPERIMENTAL DETAILS
RESULTS AND DISCUSSION
CONCLUSIONS
ACKNOWLEDGEMENTS
REFERENCES
