Analysis of the concrete-steel interface exposed to the outdoor environment and immersed in natural seawater

Abstract

The electrochemical behavior in reinforced concrete structures with and without sodium chloride (NaCl) in the mixing water in a marine / tropical environment was evaluated. The monitoring consisted of measuring the corrosion potential (Ecorr), the advance of carbonation front (xCO2) and a photographic record of the concrete / steel interface at different stages of the period of time of exposure. In the exposure to the weather, the addition of NaCl to the mixing water favored the advance of carbonation. The presence of chlorides was a determining factor at the beginning and development of the corrosion process in both exposures to the weather and immersion. Keywords: reinforced concrete; carbonation; corrosion potential; concrete-steel interface, chloride ion. Análisis de la interfaz concreto-acero de especímenes expuestos a la intemperie y sumergidos en agua de mar natural RESUMEN Se evaluó el comportamiento electroquímico en estructuras de concreto armado sin y con adición de cloruro de sodio (NaCl) en el agua de amasado en un ambiente marino/tropical. El monitoreo consistió en medir el potencial de corrosión (Ecorr), avance del frente de carbonatación (xCO2) y registro fotográfico de la interfase concreto/acero en diferentes etapas del periodo de exposición. En la exposición a la intemperie se observó que la adición de iones cloruro favoreció el avance de la carbonatación. La presencia de iones cloruro es determinante en el inicio y desarrollo del proceso de corrosión, tanto en exposición a la intemperie como en inmersión.

Sensor de corrosão para monitoramento de estruturas de concreto armado: Testes em corpos de prova de concreto armado

“…O sensor galvânico confeccionado usa como referência o sensor CorroWatch Multisensor, mas em lugar de usar como cátodo titânio ativado que é dez vezes mais caro do que o aço convencional (ISE, 2020), optou-se por utilizar o cobre. Desta forma, o trabalho trata de uma investigação relacionada com a solução de problemas relativos ao controle de qualidade, patologia e recuperação de construções, enfoque que é tema recorrente na revista Alconpat (Real et al, 2015;Hernández et al, 2016;Macioski et al, 2016;Pérez et al, 2018).…”

The importance of underpaint corrosion caused by damage to paint on steel structures

“…The presence of sodium chloride at the beginning of and during the corrosion process is decisive regarding the exposure to weathering. (Sosa et al, 2018). For group 6, only two specimens were prepared using corrosion grade D plates to verify the corrosion behavior in a specific situation of thin thickness on the convex surface, i.e., the paint on the weld points on the surface of the plate.…”