Experimental Investigate Composite Effect of Metakaolin and Pumice on Durability and Corrosion Rebar in Self-Compacting Concrete

This paper discussed the effect of adding a pumice pozzolans and metakaolin composition on durability properties of self-compacting concrete (SCC) to present a corrosion-resistant mixed to be used for decks and piers of bridges in sea areas, and marine structures. Replacement of 10% pumice and 10% metakaolin and their 10% and 15% compositions as the replacement of some part of cement were used for making mix plans of the research. Compressive strength, water permeability, specific electrical resistivity, rapid chloride migration tests (RCMT), and accelerated corrosion tests were carried out. The tests were performed at the ages of 7, 14, 28, 56, 90, and 180 days. The results showed that a pumice and metakaolin composition maintained SCC’s mechanical properties, improved concrete durability, and increased age cracking in the accelerated tests considerably as compared with a control sample. The samples reduced RCMT up to 28.1% and increased age cracking by 26.4%.