Mechanical Performance of Steel Fibre Reinforced Concrete Exposed to Wet–Dry Cycles of Chlorides and Carbon Dioxide

Abstract

This paper presents an experimental study investigating the corrosion damage of carbon-steel fibre reinforced concrete (SFRC) exposed to wet–dry cycles of chlorides and carbon dioxide for two years, and its effects on the mechanical performance of the composite over time. The results presented showed a moderate corrosion damage at fibres crossing cracks, within an approximate depth of up to 40 mm inside the crack after two-years of exposure, for the most aggressive exposure conditions investigated. Corrosion damage did not entail a significant detriment to the mechanical performance of the cracked SFRC over the time-scales investigated. Corrosion damage to steel fibres embedded in uncracked concrete was negligible, and only caused formation of rust marks at the concrete surface. Overall, the impact of fibre damage to the toughness variation of the cracked composite over the time-scale investigated was secondary compared to the toughness variation due to the fibre distribution. The impact of fibre corrosion to the performance of the cracked composite was subject to a size-effect and may only be significant for small cross-sections.

Influencia de variables experimentales en las propiedades mecánicas de los concretos reforzados con fibras de acero (SFRC) en experimentos de degradación por cloruros: revisión bibliográfica y análisis estadístico

“…As mentioned, this work focused on the influence of the aforementioned experimental variables on the reduction of the maximum load and the residual resistance after the degradation process in bending tests. In general, the authors relied on the standard EN 14651: 2007 for three-point bending tests (Marcos-Meson et al, 2021), as well as the standards EN 1015-3:1999, EN 413-2 : 2016and EN 14889-1: 2006 for the use of superplasticizer, the air content and the type of fiber to be used respectively in the preparation of concrete specimens (Marcos-Meson et al, 2020).…”

“…, the fibers improve the tensile properties of concrete, fatigue resistance, impact resistance, and toughness and help control cracking (Behbahani & Nematollahi, 2011;Kaur et al, (2012), Ferreira et al, 2018Zhang et al, 2020). SFRC is used, for example, in tunnel lining, highway construction, and buildings prone to earthquake damage (Berrocal, 2015;Marcos-Meson et al, 2019;Zhang et al, 2020). In addition, the SFRC is applied in infrastructures with aggressive environments, such as industrial floors, buildings to store nuclear waste, and hydraulic and marine structures, such as docks, oil platforms, and gas pipelines (Doo-Yeol et al, 2021;Hou et al, 2021).…”

“…On the other hand, another of the variables with influence on the variation of the maximum load according to the results obtained here is the concentration of chlorides. However, this information has yet to be corroborated due to a lack of bibliographic information; studies such as that of Marcos-Meson et al (2021) show how this variable negatively influences the properties of the SFRCs studied.…”

Study of the resistance of concrete of anisotropic and varitropic structures to alternating wetting and drying

“…Исследования, посвященные оценке стойкости бетонов к различным видам агрессивных воздействий, представлены в работах [4][5][6][7][8][9][10]. Например, в работе [4] авторами была выполнена оценка коррозионной стойкости порошкового бетона, где по результатам экспериментов было установлено, что применение надсернокислого аммония в качестве агрессивного раствора позволит значительно ускорить процесс испытаний цементных композитов на сульфатостойкость.…”

Multidimensional Transport Experiment and Simulation of Chloride Ions in Concrete Subject to Simulated Dry and Wet Cycles in a Marine Environment

“…Lu et al [26] studied the effect of the concrete mix ratio, dry-to-wet ratio, and exposure time on chloride ion penetration into concrete under the action of dry and wet cycles; the depth of chloride ion penetration increased with the increase in dry-and-wet-cycle air-drying time and exposure time. Xu et al [27] and Marcos-Meson et al [28] concluded that carbonation will accelerate the chloride ions transport in concrete under dry and wet cycles. Dong et al [29] investigated the chloride ion transport and service life of aeolian sand concrete under dry-wet cycles.…”