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۸ صفحه

The use of supplementary cementing materials and durability of concrete structures are the main issues for sustainability. Concrete deterioration and corrosion of reinforced concrete structures is a major problem in many countries. However, there is a substantial need for the construction of concrete structures in very severe environments. Survey of newly and old concrete structures in such regions show that many of these structures are not able to satisfy their minimum service life.
The use of special cements and pozzolans in corrosive regions has shown desirable performance of reinforced concrete and enhanced the durability of concrete. Results of accelerated and long term tests in simulated environments show that supplementary cementing materials can enhance the durability of concrete.
In this research work, concrete specimens containing different natural pozzolans have been thoroughly investigated. Test conducted include, compressive strength, permeability, chloride ion diffusion, corrosion of reinforcing bars, and carbonation all at different ages. The variables were the type of supplementary cementing materials and water cement ratio in concrete mixtures.
Test results at various ages are presented in this paper. The performance of concrete mixtures depends upon the type of pozzolan and their water cement ratios .Concrete mixtures containing natural pozzolans showed better performance in terms of chloride permeability and corrosion when compared with the control concrete mixtures.<\div>

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