Effect of Gasification Char and Recycled Carbon Fibres on the Electrical Impedance of Concrete Exposed to Accelerated Degradation

Abstract

This paper aims to evaluate the effect of carbon-based conductive recycled additions, i.e., recycled carbon fibres (RCF) and gasification char (GCH), on the mechanical, electrical, and durability properties of concretes. The obtained results show that the compressive strength of concrete is not affected by conductive additions, whereas electrical impedance, measured according to Wenner’s method, is significantly reduced (6%, 30% and 74% with RCF, GCH, and their combination, respectively) to the advantage of self-sensing properties. As durability is concerned, conductive additions slightly increase capillary water absorption, whereas they decrease chloride ingress through diffusion and do not significantly modify carbonation resistance.

Research on the dispersion of carbon fiber and recycled carbon fiber in cement-based materials: a review

“…Finished waste carbon fiber mainly consist of offcuts generated during the carbon fiber production process. Several researchers incorporated a mixture of carbon fiber and graphite fiber obtained from production line spools into cement-based materials (Belli et al, 2018;Mobili et al, 2021;Mobili et al, 2022a;Mobili et al, 2022b;Mobili et al, 2023). Yan et al (2022) employed trimmed waste carbon fiber as chopped fiber mixed with concrete.…”

Development and metrological characterization of cement-based elements with self-sensing capabilities for structural health monitoring purposes

“…Many materials have been recently applied to pursue this aim, both in form of fibres and fillers. Among the others we can mention steel fibres [22], carbon fibres (both virgin and recycled), nickel powder [23], carbon nanotubes [24], graphene [25], graphite [26], foundry sand [27], carbon black [28], char, and biochar [29]. In a view of green and circular economy, recently particular interest has been shown on recycled material and byproducts potentially having self-sensing capabilities; this strategy allows not only to reuse materials, but also to limit production costs.…”