Effect of the Type of Surface Treatment and Cement on the Chloride Induced Corrosion of Galvanized Reinforcements

World Multidisciplinary Civil Engineering-Architecture-Urban Planning Symposium - WMCAUS

土木建筑工程

Tittarelli, Francesca^1,2 ; Mobili, Alessandra^2 ; Maria Vicerè, Anna^1 ; Roventi, Gabriella^1 ; Bellezze, Tiziano^1

Department of Materials, Environmental Sciences and Urban Planning - SIMAU, Università Politecnica Delle Marche-UdR INSTM, Via Brecce Bianche 12, Ancona

60131, Italy^1

Institute of Atmospheric Sciences and Climate (CNR-ISAC), Via Piero Gobetti 101, Bologna

40129, Italy^2

关键词: Chloride induced corrosion;    Chlorides induced corrosions;    Corrosion behaviour;    Galvanized reinforcement;    Hexavalent chromium;    Passivation treatment;    Pozzolanic cements;    Steel-concrete interface;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/245/2/022088/pdf
DOI  :  10.1088/1757-899X/245/2/022088

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

The effect of a new passivation treatment, obtained by immersion of the galvanized reinforcements in a trivalent chromium salts based solution, on the chlorides induced corrosion has been investigated. To investigate also the effect of cement alkalinity on corrosion behaviour of reinforcements, concretes manufactured with three different European cements were compared. The obtained results show that the alternative treatment based on hexavalent chromium-free baths forms effective protection layers on the galvanized rebar surfaces. The higher corrosion rates of zinc coating in concrete manufactured with Portland cement compared to those recorded for bars in concrete manufactured with pozzolanic cement depends strongly on the higher chloride content at the steel concrete interface.