The quantity of different plastics generated after consumption is an impact factor affecting the environment, and the lack of recycling generates solid waste. The purpose of this work is to incorporate high-density recycled polyethylene fibers (HDPE) for possible use as concrete reinforcement. Physical and mechanical properties from recycled fibers were analyzed, such as density, absorption, and stress resistance, as well as workability, air content, porosity, concrete compression, and flexural strength properties. Samples were prepared with a low fiber content of 0.2% and 0.4%, as a substitution for sand weight, and lengths of 10 and 30 mm. To study corrosion phenomena, the specimens were exposed to a saline environment containing 3% sodium chloride for 365 days, and the electrochemical techniques including half-cell potential (HCP), electrochemical noise (EN), linear polarization resistance (LPR), and electrochemical impedance spectroscopy (EIS) were applied. The results showed a 4.8% increase in compressive strength with a low fiber percentage and short geometries, while flexural strength increased marginally by 2.3% with small quantities of HDPE fibers. All these factors contribute to greater material durability, less permeability, and crack control. A positive effect of fibers with short dimensions on the corrosion processes of a steel bar was observed, with the fibers acting as a physical barrier against the diffusion of chloride ions.

Chloride-induced corrosion of reinforcing steel embedded in concrete is a problem that causes the elements to lose their physical and mechanical properties and can lead to premature failures in civil works. This research article analyses the effectiveness of the green corrosion inhibitor in cement paste through the ethanolic extract of mango peel. The materials were dosed with the inhibitor added to the mixing water and the mechanical properties of the material were analysed by manufacturing cylindrical test specimens. To understand the corrosion phenomena, cubic samples were prepared and immersed in a 3 % sodium chloride (NaCl) solution for 365 days, simulating a highly aggressive chloride-ion environment. Electrochemical techniques such as half-cell potential (HCP), electro­chemical noise (EN), linear polarization resistance (LPR) and electrochemical impedance spectroscopy (EIS) are applied. The experimental results showed that the green corrosion inhibitor reduced the mechanical properties of concrete by 21.28 % compared to the blank, but a positive effect was observed in the corrosion evaluation. Initially, the inhibitor delayed the onset of corrosion, as indicated by high electrochemical noise and linear polarization resistance values due to the formation of a film of organic compounds present in the inhibitor extracts that acted on the active sites on the steel surface.

For some years, there has been interest in exploring the efficacy of corrosion inhibitors that are more environmentally friendly. The objective of this research is to evaluate the inhibitory potential of mango peel ethanol extract on the corrosion of carbon steel. The maceration method was used to obtain the inhibitor extract, and the concentrations used were 20, 50, and 100 ppm in a 3% NaCl saline solution that simulates a highly aggressive environment. Characterization of the chemical compounds was performed by FT‐IR and UV‐visible spectra. Electrochemical tests of electrochemical noise (EN), potentiodynamic curves, and electrochemical impedance spectroscopy (EIS) were performed. The results showed that the optimum concentration obtained for the corrosion inhibitors is 50 ppm, producing an efficiency of 63.11% in the polarization curves. The adsorption of the chemical compounds present in the mango peel extract on the surface of the steel obeys the Langmuir adsorption isotherm.

Chloride ion diffusion is an important parameter in the corrosion of reinforcing steel in concrete, exposed to marine conditions. This research study aims to investigate the effects of natural palm and mango fibers on reinforced concrete. Concrete cubes were manufactured and two volume fractions of fiber were tested with 0.2 and 0.4% relative to the weight of the sand and fiber dimensions of 1 cm and 3 cm in length. The samples were cured for 28 days and then submerged in a 3% sodium chloride saline solution simulating an aggressive marine environment. Electrochemical measurements were performed periodically over a period of 365 days. The corrosion rate of steel bars in reinforced concrete with different fiber contents was analyzed using the half-cell potential. electrochemical noise, linear polarization resistance, electrochemical impedance spectroscopy, and visual observation analysis. The results showed an initial positive effect of short mango and palm fibers in delaying the onset of corrosion in reinforced concrete compared to fiber-free control concrete. The values for short fibers (1×105 Ω·cm2) are an order of magnitude higher than those for long fibers (1×104 Ω·cm2), based on polarization resistance. However, during the final exposure period, the fibers showed a negligible influence on its corrosion resistance compared to fiber-free concrete. The type of corrosion present on the surface of the steel was localized with possible pitting, that is, corrosion developed in small points of the rod. The size, concentration, and type of fiber directly influence the electrochemical processes of reinforcing steel in concrete.

Las instituciones de educación superior (IES) desempeñan un papel fundamental en la promoción del desarrollo sostenible mediante la integración de prácticas ambientales en sus actividades académicas, administrativas y de infraestructura. Entre los desafíos asociados a la sostenibilidad universitaria destaca la gestión de los residuos de construcción y demolición (RCD), cuya generación se incrementa debido a los procesos de construcción, remodelación y mantenimiento de los campus. El objetivo de este estudio fue analizar el estado del conocimiento sobre la gestión de RCD en las IES, identificando estrategias, enfoques y experiencias reportadas en la literatura científica. Para lograr el objetivo, se realizó una revisión sistemática cualitativa, mediante cuatro fases: búsqueda, evaluación, análisis y síntesis; la lista final se conformó por 15 estudios científicos y 18 documentos institucionales. Los resultados muestran una evolución, desde enfoques centrados en el tratamiento y reciclaje de residuos, hasta estrategias de reutilización, valorización y economía circular. Sin embargo, se encontró que el desarrollo del conocimiento sobre RCD no se ve reflejado en su implementación en las universidades. Además, se observó una limitada articulación entre las etapas de selección, caracterización, procesamiento y reincorporación de los RCD como materiales reciclados. Se concluye que la gestión de RCD constituye un componente estratégico para la consolidación de campus sostenibles y para el cumplimiento de los Objetivos de Desarrollo Sostenible.trad