Durabilidad de morteros de reparación sustentables expuestos a ambiente industrial

Mendoza-Rangel, J. M.; Flores-Jarquín, J. M.; De-Los-Santos, E. U.; Terradillos, Pedro Garcés

doi:10.21041/ra.v6i1.114

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…Electrical resistivity was evaluated as a parameter of durability of the repair mortars, so that this technique can be used to establish the relationship with properties, such as: degree of hydration of the cement [ 63 ], resistance to compression [ 64 , 65 , 66 , 67 , 68 , 69 , 70 ], resistance to permeability to Cl − ion [ 71 ], setting time [ 72 ], and probability of corrosion [ 73 ]. The electrical resistivity can be indirectly related to the porosity of the mortar or concrete and, therefore, may be linked to the susceptibility of the entrance of aggressive agents.…”

Section: Resultsmentioning

confidence: 99%

Corrosion Behavior of AISI 1018 Carbon Steel in Localized Repairs of Mortars with Alkaline Cements and Engineered Cementitious Composites

et al. 2020

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The selection of materials for repairs of reinforced concrete structures is a serious concern. They are chosen for the mechanical capacity that the repair mortar achieves. However, several important characteristics have been left aside, such as the adhesion of the repair mortar with the concrete substrate, the electrical resistivity and—hugely important—the protection against corrosion that the repair material can provide to the reinforcing steel. The aim of this work was to study the corrosion behavior of AISI 1018 carbon steel (CS) in mortars manufactured with alkaline cements, engineered cementitious composites (ECC), and supplementary cementitious materials (SCM). Two types of ordinary Portland cement (OPC) 30R and 40R were used. The constituent materials for the mortars with ECC mixture mortars they use OPC 40R, class F fly ash (FA), silica fume (SF) and polypropylene (PP) fibers. The sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) were used as activating agents in alkali activated cements. The reinforced specimens were immersed in two different electrolytes, exposed to a 3.5 wt % of NaCl and Na2SO4 solutions, for 12 months and their electrochemical behavior was studied by half-cell potential (Ecorr) and linear polarization resistance (LPR) according to ASTM C876-15 and ASTM G59-97, respectively. The results obtained indicated that, the mortar they have the best performance and durability, is the conventional MCXF mortar, with OPC 30R and addition of 1% polypropylene PP fiber improves the behavior against the attack of chlorides and sulfates.

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Section: Resultsmentioning

confidence: 99%

Corrosion Behavior of AISI 1018 Carbon Steel in Localized Repairs of Mortars with Alkaline Cements and Engineered Cementitious Composites

et al. 2020

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“…En este orden de ideas, puede decirse que, aunque el concreto natural utilizado para elaborar morteros naturales desde épocas de la antigua Roma renovó las técnicas de construcción en su momento [8]; en América Latina se han presentado, históricamente, variaciones y adaptaciones propias con aglomerantes tales como la cal y el yeso [11], motivadas en gran medida por la autoconstrucción en la vivienda popular [12], y con evidencias de estudios de durabilidad de morteros sostenibles en ambientes industriales [13]. En este contexto, es pertinente hoy día preguntarse si los materiales utilizados en su elaboración son adecuados para el desarrollo de un mortero natural cumpliendo con la normatividad colombiana, en cuanto a sus propiedades mecánicas, para entrar dentro de la clasificación de lo que se suele denominar como mortero.…”

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Estudio del comportamiento de muestras de mortero natural sometidas a esfuerzo de compresión

et al. 2018

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Físicas;Resumen: La combinación de diversos materiales, ya sea por decisión tecnológica o casualidad, permitió la construcción y conservación de edificaciones antiguas que aún siguen en pie. Buscando replicar las características de estas construcciones, materiales como cal, puzolana, y yeso fueron seleccionados para elaborar un mortero natural y comparar sus propiedades físicas y resistencia a la compresión con las de un mortero tipo portland, con el fin, de establecer una línea base de comportamiento para aplicación en obras civiles. Se empleó una metodología de post prueba únicamente con diseño factorial experimental y grupo intacto. En todas las muestras se presentó sedimentación producida por la diferencia de tamaño de partículas y el fenómeno de exudación, ocasionando bajas resistencias en el material.Abstract: The combination of materials by technology or mere chance allowed the construction and conservation of old buildings that to this day are still standing. Looking for the reproduction of this characteristics, materials such as lime, pozzolan, and gypsum were selected for elaboration of a natural mortar for comparison of the physical properties and compressive strength versus the Portland mortar. These studies are required to establish a baseline for generating applications in different civil works. The experimental methodology included post-test only analysis with factorial design and intact group. In all the evaluated samples, sedimentation occurred due to the difference in particle size and the exudation phenomenon, causing low resistance values.

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Evaluation of Chloride Diffusion and Corrosion Resistance in Reinforced Concrete Using Internal Curing and Shrinkage Reducing Admixtures

Vázquez-Rodríguez¹

2018

International Journal of Electrochemical Science

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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 (I corr ) and corrosion potentials (E corr ) 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.

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Durabilidad de morteros de reparación sustentables expuestos a ambiente industrial

Cited by 3 publications

References 7 publications

Corrosion Behavior of AISI 1018 Carbon Steel in Localized Repairs of Mortars with Alkaline Cements and Engineered Cementitious Composites

Corrosion Behavior of AISI 1018 Carbon Steel in Localized Repairs of Mortars with Alkaline Cements and Engineered Cementitious Composites

Estudio del comportamiento de muestras de mortero natural sometidas a esfuerzo de compresión

Evaluation of Chloride Diffusion and Corrosion Resistance in Reinforced Concrete Using Internal Curing and Shrinkage Reducing Admixtures

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