Electrochemical study on the chloride corrosion susceptibility of cementitious composites produced with sugarcane bagasse ash sand

• Published in: Construction & building materials Vol. 397; p. 132341
• Main Authors: de A.M. Rezende, Mariana, Corradini, Patricia G., Sales, Almir, Mascaro, Lucia H.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15.09.2023
• Subjects: Aggregate; Chloride environment; Concrete applications; Corrosion; Passivation; Sugarcane bagasse ash sand; Waste management; Waste management; Sugarcane bagasse ash sand; Chloride environment; Corrosion; Aggregate; Concrete applications; Passivation
• ISSN: 0950-0618; 1879-0526
• DOI: 10.1016/j.conbuildmat.2023.132341

[Display omitted] •SBAS was used as an agroindustrial bioadditive to concrete.•The reinforcement of SBAS concrete passivates around 7–15 days.•SBAS reinforced concrete exhibited a protective passivation film.•SBAS reinforced concrete is resistant to chloride corrosion. Sugarcane bagasse ash sand (SBAS) has been studied as a potential additive for reinforcement structures, but long-term (more than a week) studies on its use in test specimens have not been conducted considering the durability of these concretes. Additionally, there has been no assessment of electrochemical corrosion in corrosive media, such as chloride solutions. In this study, we conducted a physical and electrochemical investigation of SBAS, which partially replaces fine sand in a mortar configuration. Electrochemical impedance spectroscopy and open circuit potential monitoring techniques were used to evaluate the reinforcements in Ca(OH)2 (curing environment) and NaCl 3.5% (aggressive environment), and SEM-EDS was used to analyze the reinforcement surface. During the curing process, SBAS concrete formed a passivation film after a longer time (7–14 days) than the reference (REF) (7 days), and the passive film showed higher resistance values than the REF sample. After 191 days in the chloride medium, REF and SBAS samples presented similar corrosion resistance. Therefore, SBAS-reinforced concrete could be a sustainable and effective alternative to conventional concrete for structural applications.