Durability-Oriented Characterization of Conventional Concretes: Input Parameters for Corrosion Analysis of Rc-Beams in Marine Environments

Chloride-induced corrosion is one of the main deterioration problems of reinforced concrete (RC) structures in marine environments. Design codes set prescriptive requirements for such conditions, including compressive strength, cement content, w/c ratio, minimum cover depth, and maximum allowable crack widths. However, performance-based approaches are needed to better understand the material properties that influence durability. This study presents the characterization of two conventional concretes (25 MPa and 35 MPa), as part of an experimental program to evaluate RC beams' performance under marine exposure. This is particularly relevant in the Latin American context, where informal construction with lower-strength concretes is predominant. Standardized tests were conducted to assess indirect indicators of durability: oxygen permeability, accessible porosity, chloride migration, and electrical resistivity. Results show consistent differences between mixes, with the 35 MPa concrete exhibiting lower permeability, porosity, and chloride migration coefficients, and higher resistivity. These indicators confirm improved durability performance associated with mixed design parameters. The results obtained will provide essential input data for the next stages of the research, in which beams with controlled crack widths and cover depths (prescriptive variables defined by design codes) will be exposed to marine conditions to analyze corrosion initiation and propagation. The present outcomes establish the baseline for performance-based durability assessment and service-life estimation of RC elements, contributing to more sustainable design strategies, extending service life, and reducing maintenance interventions.