Concrete infrastructures are susceptible to corrosion in acidic environments; therefore, the constituent material should be engineered to sense the onset of ion penetration and propagation into the critical sites of the structure. Based on this concept, an intelligent alkali activated chemiresistor has been designed to sense the presence and concentration of sulphuric acid (𝐻2𝑆𝑂4), considering the prerequisites of the structural health monitoring of durable cementitious structures. The proposed nanocomposite developed out of SWCNTs, fly ash, ground granulated blast-furnace-slag (GGBS), and sodium silicate, is a built-in, low-powered, and ambience-operating structural element. 𝐻2𝑆𝑂4 was introduced on the surface of the highly alkaline, porous, and fractured sensor. The chemiresistor responses were distinguishable as the consequence of 𝐻2𝑆𝑂4 neutralization and speciation into sulphate (𝑆𝑂42−) and hydrogen sulphate (𝐻𝑆𝑂4−) species. This fundamental study can facilitate the future real-time aggressive ion interrogation potential of the SWCNT alkali activated nanocomposites in the construction industry.

Sulphuric acid sensing of single-walled carbon nanotubes incorporated alkali activated materials

Sgarzi, Massimo
;
2022

Abstract

Concrete infrastructures are susceptible to corrosion in acidic environments; therefore, the constituent material should be engineered to sense the onset of ion penetration and propagation into the critical sites of the structure. Based on this concept, an intelligent alkali activated chemiresistor has been designed to sense the presence and concentration of sulphuric acid (𝐻2𝑆𝑂4), considering the prerequisites of the structural health monitoring of durable cementitious structures. The proposed nanocomposite developed out of SWCNTs, fly ash, ground granulated blast-furnace-slag (GGBS), and sodium silicate, is a built-in, low-powered, and ambience-operating structural element. 𝐻2𝑆𝑂4 was introduced on the surface of the highly alkaline, porous, and fractured sensor. The chemiresistor responses were distinguishable as the consequence of 𝐻2𝑆𝑂4 neutralization and speciation into sulphate (𝑆𝑂42−) and hydrogen sulphate (𝐻𝑆𝑂4−) species. This fundamental study can facilitate the future real-time aggressive ion interrogation potential of the SWCNT alkali activated nanocomposites in the construction industry.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10278/5004941
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