Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Corrosion and Service Life Assessment of Concrete Structures
In the past two decades, developing world is witnessing a construction boom. Many infrastructural systems such as highway/railway bridges, high-rise buildings, and power plants have been constructed in regions with significant chloride and/or carbonation exposure. These structures are expected to be serviceable for more than 100 years. However, many structures experience premature corrosion due to the race for fast-track construction, unavailability of skilled workers, lack of awareness of consequences of poor construction site practices, and low quest for quality/durability among some of the stakeholders. Therefore, it is essential to quantify the effect of these prevailing practices on corrosion characteristics of steel-binder interface (say, chloride threshold). Chloride threshold is the minimum chloride concentration at steel-binder interface required to initiate the corrosion of steel embedded in concrete. The existing test methods based on half-cell potential (HCP), linear polarization resistance (LPR), or electrochemical impedance spectroscopy (EIS)have limitations in assessing the corrosion characteristics of new-age concrete systems. Therefore, there is a dire need to develop a new test methodology to enable practitioners to evaluate the characteristics of new materials and effect of prevailing practices on corrosion characteristics and service life of RC structures. This chapter highlights the limitations of HCP, LPR, and EIS in assessing the RC systems with various steels and binders. Then, test methods based on EIS are proposed to evaluate the chloride threshold of steels (uncoated and coated steels and prestressing strand) embedded in various binder systems. Also, a framework is proposed on how to use the chloride threshold value and nomograms for service life estimation.
Corrosion and Service Life Assessment of Concrete Structures
In the past two decades, developing world is witnessing a construction boom. Many infrastructural systems such as highway/railway bridges, high-rise buildings, and power plants have been constructed in regions with significant chloride and/or carbonation exposure. These structures are expected to be serviceable for more than 100 years. However, many structures experience premature corrosion due to the race for fast-track construction, unavailability of skilled workers, lack of awareness of consequences of poor construction site practices, and low quest for quality/durability among some of the stakeholders. Therefore, it is essential to quantify the effect of these prevailing practices on corrosion characteristics of steel-binder interface (say, chloride threshold). Chloride threshold is the minimum chloride concentration at steel-binder interface required to initiate the corrosion of steel embedded in concrete. The existing test methods based on half-cell potential (HCP), linear polarization resistance (LPR), or electrochemical impedance spectroscopy (EIS)have limitations in assessing the corrosion characteristics of new-age concrete systems. Therefore, there is a dire need to develop a new test methodology to enable practitioners to evaluate the characteristics of new materials and effect of prevailing practices on corrosion characteristics and service life of RC structures. This chapter highlights the limitations of HCP, LPR, and EIS in assessing the RC systems with various steels and binders. Then, test methods based on EIS are proposed to evaluate the chloride threshold of steels (uncoated and coated steels and prestressing strand) embedded in various binder systems. Also, a framework is proposed on how to use the chloride threshold value and nomograms for service life estimation.
Corrosion and Service Life Assessment of Concrete Structures
Indian Institute of Metals Series
Kamachi Mudali, U. (Herausgeber:in) / Subba Rao, Toleti (Herausgeber:in) / Ningshen, S. (Herausgeber:in) / G. Pillai, Radhakrishna (Herausgeber:in) / P. George, Rani (Herausgeber:in) / Sridhar, T. M. (Herausgeber:in) / Kamde, Deepak (Autor:in) / Joseline, Dyana (Autor:in) / Rengaraju, Sripriya (Autor:in) / Karuppanasamy, Jayachandran (Autor:in)
05.05.2022
17 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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