Micro- and meso-structural changes on electrically cured ultra-high performance fiber-reinforced concrete with dispersed carbon nanotubes

This study investigated the potential application of electrical curing method on ultra-high performance fiber-reinforced concrete (UHPFRC) by incorporating carbon nanotubes (CNTs) and resulting structural changes in micro- and meso-scale. The addition of CNTs significantly decreased the electrical r...

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Bibliographic Details
Published in:Cement and concrete research 2020-11, Vol.137, p.106214, Article 106214
Main Authors: Jung, Myungjun, Park, Ji-seul, Hong, Sung-Gul, Moon, Juhyuk
Format: Article
Language:English
Subjects:
Carbon nanotubes
Carbon nanotubes (CNTs)
Crosslinking
Curing
Electrical curing
Fiber reinforced concretes
Fractal geometry
Low voltage
Mechanical properties
Microstructure
Reinforced concrete
Steam curing
Ultra-high performance fiber-reinforce concrete (UHPFRC)
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Summary:This study investigated the potential application of electrical curing method on ultra-high performance fiber-reinforced concrete (UHPFRC) by incorporating carbon nanotubes (CNTs) and resulting structural changes in micro- and meso-scale. The addition of CNTs significantly decreased the electrical resistance of the UHPFRC, and the temperature inside the UHPFRC was able to increase to 90 °C under low voltage by the Joule effect. This enabled electrical curing, which can produce a similar effect to steam curing but in a much more energetically efficient way. The added CNTs slightly hindered the hydration reaction of the UHPFRC, but it modified the formation of C-(A)-S-H to be denser, stiffer, and more complex which have been evidenced by observed partial cross-linking in the C-(A)-S-H and the higher fractal dimension of solid system. The results of this study are promising for using UHPFRC in on-site field condition and extending the application of CNTs in structural materials. [Display omitted]
ISSN:0008-8846
1873-3948
DOI:10.1016/j.cemconres.2020.106214