Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Corrosion performance of blended concretes exposed to different aggressive environments
Highlights Impress voltage and wetting/drying cycles were used as chloride induced corrosion. The MK, SF and OPC concretes subjected to accelerated corrosion were examined. In the simultaneous exposition to CO2 and Cl−, SF-concrete greatly reduces corrosion. Under carbonation MK and SF concretes shown higher corrosion rates than OPC. Use of metakaolin and silica fume enhances chloride resistance of concrete.
Abstract The research study presented herein evaluates the corrosion behaviour of the reinforcing steel in blended concretes using two pozzolanic additives—metakaolin (MK) and silica fume (SF)—at 10% replacement of cement weight. They are exposed to CO2 and chlorides. The corrosion process was followed by monitoring of open-circuit potential (OCP), polarisation resistance (Rp) and electrochemical impedance spectroscopy (EIS). Electrochemical measurements show that the addition of MK and SF enhances corrosion resistance exposed to chlorides, however under accelerated carbonation these concretes show higher corrosion rates. In the simultaneous exposition to carbon dioxide and chlorides, SF-concrete shows a decrease of corrosion rate.
Corrosion performance of blended concretes exposed to different aggressive environments
Highlights Impress voltage and wetting/drying cycles were used as chloride induced corrosion. The MK, SF and OPC concretes subjected to accelerated corrosion were examined. In the simultaneous exposition to CO2 and Cl−, SF-concrete greatly reduces corrosion. Under carbonation MK and SF concretes shown higher corrosion rates than OPC. Use of metakaolin and silica fume enhances chloride resistance of concrete.
Abstract The research study presented herein evaluates the corrosion behaviour of the reinforcing steel in blended concretes using two pozzolanic additives—metakaolin (MK) and silica fume (SF)—at 10% replacement of cement weight. They are exposed to CO2 and chlorides. The corrosion process was followed by monitoring of open-circuit potential (OCP), polarisation resistance (Rp) and electrochemical impedance spectroscopy (EIS). Electrochemical measurements show that the addition of MK and SF enhances corrosion resistance exposed to chlorides, however under accelerated carbonation these concretes show higher corrosion rates. In the simultaneous exposition to carbon dioxide and chlorides, SF-concrete shows a decrease of corrosion rate.
Corrosion performance of blended concretes exposed to different aggressive environments
Aguirre-Guerrero, Ana María (Autor:in) / Mejía-de-Gutiérrez, Ruby (Autor:in) / Montês-Correia, Maria João Ribeiro (Autor:in)
Construction and Building Materials ; 121 ; 704-716
14.06.2016
13 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Corrosion performance of blended concretes exposed to different aggressive environments
| British Library Online Contents | 2016
Corrosion performance of blended concretes exposed to different aggressive environments
| Online Contents | 2016
Corrosion performance of blended concretes exposed to different aggressive environments
| British Library Online Contents | 2016
Corrosion performance of blended concretes exposed to different aggressive environments
| British Library Online Contents | 2016