Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Proposal and verification of a new isotherm based on exponential-asymptotic dependence between free and bound chlorides in reinforced concrete
Highlights We propose a new isotherm that relates free and bound chloride. The isotherm contains only two coefficients, making it easy to adjust. Its physical–chemical meaning is explained. Its behavior is compared with other expressions (Langmuir, Freundlich, etc.). It corrects the inflection contained in the initial stretch of Langmuir-Freundlich dependence.
Abstract The so-called isotherms represent the relationship between free and bound chlorides in the process of penetration of chloride ions in concrete structures. A new isotherm of the exponential-asymptotic type that corrects and improves the behavior of the classical four dependences in low porosity concrete subjected to high concentrations of chloride is present in this paper. The proposed isotherm has two advantages over the classic ones, in particular compared to that of Langmuir-Freundlich considered the most accurate. On the one hand, it contains only two coefficients so it is easy to adjust to the pairs (free chloride, bound chloride) obtained in experimental tests, on the other, it corrects the inflection contained in the initial stretch of Langmuir-Freundlich dependence. Data coming from experimental tests extracted from the scientific literature are used to fit the coefficients of all isotherms and long-term numerical simulations are performed to reproduce the concentration profiles and verify the consistent and precise behavior of the proposed isotherm to predict the first stage of the service life of the reinforced concrete structures.
Proposal and verification of a new isotherm based on exponential-asymptotic dependence between free and bound chlorides in reinforced concrete
Highlights We propose a new isotherm that relates free and bound chloride. The isotherm contains only two coefficients, making it easy to adjust. Its physical–chemical meaning is explained. Its behavior is compared with other expressions (Langmuir, Freundlich, etc.). It corrects the inflection contained in the initial stretch of Langmuir-Freundlich dependence.
Abstract The so-called isotherms represent the relationship between free and bound chlorides in the process of penetration of chloride ions in concrete structures. A new isotherm of the exponential-asymptotic type that corrects and improves the behavior of the classical four dependences in low porosity concrete subjected to high concentrations of chloride is present in this paper. The proposed isotherm has two advantages over the classic ones, in particular compared to that of Langmuir-Freundlich considered the most accurate. On the one hand, it contains only two coefficients so it is easy to adjust to the pairs (free chloride, bound chloride) obtained in experimental tests, on the other, it corrects the inflection contained in the initial stretch of Langmuir-Freundlich dependence. Data coming from experimental tests extracted from the scientific literature are used to fit the coefficients of all isotherms and long-term numerical simulations are performed to reproduce the concentration profiles and verify the consistent and precise behavior of the proposed isotherm to predict the first stage of the service life of the reinforced concrete structures.
Proposal and verification of a new isotherm based on exponential-asymptotic dependence between free and bound chlorides in reinforced concrete
Alhama, I. (Autor:in) / Sánchez-Pérez, J.F. (Autor:in)
08.07.2020
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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