Evaluation of Chloride Diffusion and Corrosion Resistance in Reinforced Concrete Using Internal Curing and Shrinkage Reducing Admixtures
| Autor: | Nora Elizondo Villarreal, A.M. Guzmán, Ana María Arato Tovar, Dora Irma Martínez Delgado, Francisco Javier Vázquez Rodríguez, Rodrigo Puente Ornelas, Edén A. Rodríguez |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Carbonation 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Chloride law.invention Corrosion Portland cement law Fly ash 0103 physical sciences Service life Electrochemistry medicine Composite material 0210 nano-technology Curing (chemistry) Shrinkage medicine.drug |
| Zdroj: | International Journal of Electrochemical Science. :6027-6047 |
| ISSN: | 1452-3981 |
| Popis: | The properties of high-performance concretes obtained by the internal curing technique were studied in the fresh and hardened states. In some of the concrete mixtures, fine normal weight aggregates were replaced with lightweight aggregates (LWA) at 20 % vol. and ordinary portland cement was replaced by pulverized class F fly ash at 20 % by mass. Additionally, some mixtures were prepared including a shrinkage-reducing admixture, either as part of the mixing water or pre-soaked into the lightweight fine aggregates. The prepared concretes were subjected to degradation tests, such as accelerated carbonation and chloride ion deterioration. In addition, the reinforced concretes were analyzed through electrochemical corrosion tests with the linear polarization resistance technique. It was found that the internally cured concretes presented a mechanical resistance similar to those reported for the reference concretes (conventional concretes), but provided a higher resistance to carbonation, rapid penetration of chloride ions, and a lower chloride ion diffusion coefficient. The reinforcing steel structure in the internally cured concretes showed lower corrosion currents (Icorr) and corrosion potentials (Ecorr) in comparison to the reference concretes. Therefore, the use of the internal curing technique in concretes with pre-soaking in either water or a solution of shrinkage-reducing admixture can be considered as a viable alternative to extend the service life of concrete structures in contact with harmful environments. |
| Databáze: | OpenAIRE |
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