Corrosion evaluation of patch repair material using seawater mixed mortar

The rapid infrastructure development in the world highlights the significance of mortar, especially in mitigating corrosion damage by using patching material. This experiment demonstrated the impact of corrosion prevention method by coating techniques, binder type, cover thickness, and several exposure conditions on the corrosion resistance. Cube-shaped specimens were fabricated with two round steel bars and cover depth of 3 cm and 5 cm, using Portland Pozzolan Cement (PPC) and Portland Composite Cement (PCC) as the binders. Corrosion protection methods including steel coating and surface concrete coating were used. Half-cell potential test was used to periodically measure the corrosion probability. The result showed that PCC demonstrated superior corrosion resistance relative to PPC, principally because to its increased CaO content, which improves strength and reduces permeability. A cover depth of 5 cm demonstrated more efficacy than 3 cm in reducing corrosion risk by restricting the ingress of chloride ions. Corrosion was shown to increase when saltwater was utilized as a mixing water, especially during wet and dry-wet cycles. Surface concrete coating was shown to be the most efficient of the corrosion protection approaches, drastically decreasing damaged areas by closing pores and limiting air and water infiltration. While steel coatings were applied and provide some protection, their efficacy was seen to be less reliable. Dry exposure conditions were identified as optimum, since less contact with water decreased the likelihood of rusting. These results underscore the significance of material selection, cover depth, and protective coatings in reducing corrosion in reinforced concrete buildings.