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Methods of Monitoring Reinforced Concrete Corrosion in Formulations for Nuclear Facilities

Two concrete formulations, one of ordinary portland cement and one of pozzolanic portland cement, are compared by rebar corrosion criteria. Both formulations are candidates for nuclear applications whose durability requirement is higher than 300 years.

Product Number: 51317--9154-SG
ISBN: 9154 2017 CP
Author: Damián Vazquez
Publication Date: 2017
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The reinforced concrete is one of the main materials used for the construction of facilities designed for the development of peaceful activities of nuclear energy. This material in addition to being structural is a barrier for insulation and confinement of the radioactive materials. One of its degradation mechanisms is reinforcement corrosion a frequent cause of failure in service. Consequently it is essential to study this mechanism of degradation in formulations developed for this purpose as well as the development and implementation of monitoring techniques for real structures.The objective of this work is to compare from the corrosion point of view two concrete formulations: one made with ordinary portland cement and the other with pozzolanic portland cement. Both formulations are candidates for nuclear applications whose durability requirement is higher than 300 years. The results of approximately four years and six months of monitoring are presented. Those parameters are: corrosion potential and corrosion rate of the reinforcements electrical resistivity oxygen flow and internal temperature of concrete. These parameters were measured in reinforced concrete specimens by embedded sensors previously developed in our laboratory. Besides the carbonation rate and chloride diffusion coefficient were also measured using unreinforced specimens. The presence of reinforcements provides the possibility of monitoring directly on them the corrosion potential the corrosion rate and electrical resistivity of concrete using a commercial instrument widely used in the work reported in the literature. This allows comparison of different parameters associated with the corrosion process monitored by embedded sensors and the commercial instrument.

Key words: Reinforced concrete corrosion, durability of reinforced concrete, nuclear materials

The reinforced concrete is one of the main materials used for the construction of facilities designed for the development of peaceful activities of nuclear energy. This material in addition to being structural is a barrier for insulation and confinement of the radioactive materials. One of its degradation mechanisms is reinforcement corrosion a frequent cause of failure in service. Consequently it is essential to study this mechanism of degradation in formulations developed for this purpose as well as the development and implementation of monitoring techniques for real structures.The objective of this work is to compare from the corrosion point of view two concrete formulations: one made with ordinary portland cement and the other with pozzolanic portland cement. Both formulations are candidates for nuclear applications whose durability requirement is higher than 300 years. The results of approximately four years and six months of monitoring are presented. Those parameters are: corrosion potential and corrosion rate of the reinforcements electrical resistivity oxygen flow and internal temperature of concrete. These parameters were measured in reinforced concrete specimens by embedded sensors previously developed in our laboratory. Besides the carbonation rate and chloride diffusion coefficient were also measured using unreinforced specimens. The presence of reinforcements provides the possibility of monitoring directly on them the corrosion potential the corrosion rate and electrical resistivity of concrete using a commercial instrument widely used in the work reported in the literature. This allows comparison of different parameters associated with the corrosion process monitored by embedded sensors and the commercial instrument.

Key words: Reinforced concrete corrosion, durability of reinforced concrete, nuclear materials

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