Performance of mortars for coating reinforced concrete structures located in marine environments

Abstract

It can be stated that knowledge about how mortar coatings can influence the penetration of chloride ions in reinforced concrete structures is still incipient, especially in those located in maritime environments with high exposure to these aggressive agents. In this context, evaluating the performance of coating mortars can help in the development of more effective solutions to protect reinforced concrete structures, bringing benefits to the construction industry and the environment, since, by increasing the durability of structures, maintenance costs and environmental damage decrease. Therefore, this work aims to verify the performance regarding the penetration of chlorides in mixed mortar composed of cement and hydraulic lime as binders, and another mixed mortar with the replacement of 10% of Portland cement with ash from burning coal. mineral in addition to hydraulic lime in the same proportion of the first one, and finally compare these two traces with similar studies. For that, test specimens were prepared and subjected to chloride diffusion tests, with variations in the degree of saturation (GS) at 100%, 85% and 65%, which allowed, through potentiometric titration tests, to obtain the chloride profiles of each sample. From the findings, it was observed that the samples have adequate mechanical resistance and high permeability and void rates.