The Behaviour of Portland - Pozzolana Cement Concrete in Aggressive Environments

Y., Alhassan A.; O., Apata A.
August 2012
Journal of Emerging Trends in Engineering & Applied Sciences;Aug2012, Vol. 3 Issue 4, p673
Academic Journal
The study present the behavior of fly ash/Portland cement mix, Calcined clay /Portland cement mix and rice husk ash/ Portland cement mix as cementing agents in the production of concrete. Mix ratio of 1:2:4 and percentage replacement level: 0, 10, 20, and 30 percents of cement by the various pozzolanas were used. Concrete cubes of size 150 mm x150 mm x 150 mm were cast, cured in aggressive media (CuSO4 and NaCl solutions) and crushed at 30 days, 60 days and 90 days to determine their compressive strength hence durability. Test results indicated that fly ash, calcined clay, and rice husk ash were pozzolanic. Compressive strength increases for calcined clay as its contents increases from 10% -30% signifying improved durability, while it is the opposite for fly ash and rice husk ash. All three pozzolanas showed improved durability, with fly ash been the most workable and calcined clay the least workable. Though, the results of the compressive strength of the concrete cubes made from portland-pozzolana cement (PPC) were not higher than that of the control (0% Portland cement replacement), they were all higher than the minimum strength specified in the British Standard code (ASTM C618, 1992). It was also observed that NaCl solution have a more severe effect on the durability for all three pozzolanas. The purpose of the study is to develop alternative to cement for use in aggressive environment.


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