Abstract
Accelerated carbonation tests have been carried out on Portland cement mortars and pastes partially substituted with a spent fluid catalytic cracking catalyst (FCC). This study has revealed that the incorporation of FCC on mortars produces a significant reduction of the alkaline reserve. Furthermore, it has been observed that this pozzolan also produces a reduction in mortar porosity. When the FCC/cement system is carbonated, both portlandite and CAH/CASH are transformed, yielding calcium carbonate. When the water/binder ratio (w/b) is low, the carbonation rate of mortars is negligible and is not modified by the presence of FCC. When the w/b ratio is medium or high, the carbonation rate rises sharply. In these cases, the presence of FCC accelerates the carbonation process suggesting that the reduction in porosity does not compensate for the reduction in portlandite which acts as a chemical barrier. INTRODUCTION EXPERIMENTAL RESULTS AND DISCUSION CONCLUSIONS ACKNOWLEDGEMENTS REFERENCES
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