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.
Highlights
The structural integrity of concrete-based artifacts is of great importance in guaranteeing its safety for the final users and to better manage the structure’s service life costs
It is possible to notice that, in the last day of the test, there is a rapid increase of Qi in both recycled carbon fibres (RCF) and gasification char (GCH) specimens, meaning that they have not reached saturation as opposed to REF, which is mirrored by a slight decrease of electrical impedance (Figure 12)
All the tested carbon-based additions additions seem seem to to make make concrete concrete more more resistant resistant to to chloride chloride penetration, penetration, something something which which is different to when chlorides penetrate from the contact with a chloride-rich solution
Summary
The structural integrity of concrete-based artifacts (buildings, tunnels, bridges, etc.) is of great importance in guaranteeing its safety for the final users and to better manage the structure’s service life costs. From “The Law of Fives” proposed by De Sitter [1], it is well known that the costs for repairing a concrete structure exponentially grow with the time elapsed between the first sign of degradation and intervention For this reason, research has been active in developing strategies to promptly identify these signs of degradation, strategies which involve the use of different types of sensors. The answer to this question is yes, concrete can This ability is referred to as the self-sensing capability of concrete [2]. Measured electrical impedance takes into account both of the above-mentioned conduction mechanisms [8] It should be Sustainability 2022, 14, 1775.
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