Combined Functionalization of Carbon Nanotubes (CNT) Fibers with H2SO4/HNO3 and Ca(OH)2 for Addition in Cementitious Matrix

Eduardo Batiston; Paulo Ricardo de Matos; Philippe Jean Paul Gleize; Roman Fediuk; Sergey Klyuev; Nikolai Vatin; Maria Karelina

doi:10.3390/fib9030014

Fibers (Mar 2021)

Combined Functionalization of Carbon Nanotubes (CNT) Fibers with H2SO4/HNO3 and Ca(OH)2 for Addition in Cementitious Matrix

Eduardo Batiston,
Paulo Ricardo de Matos,
Philippe Jean Paul Gleize,
Roman Fediuk,
Sergey Klyuev,
Nikolai Vatin,
Maria Karelina

Affiliations

Eduardo Batiston: Department of Civil Engineering, Community University of the Chapecó Regions, Chapeco 89809-900, Brazil
Paulo Ricardo de Matos: Department of Civil Engineering, Federal University of Santa Catarina, Florianópolis 88040-900, Brazil
Philippe Jean Paul Gleize: Department of Civil Engineering, Federal University of Santa Catarina, Florianópolis 88040-900, Brazil
Roman Fediuk: Polytechnic Institute, Far Eastern Federal University, 690922 Vladivostok, Russia
Sergey Klyuev: Department of Theoretical Mechanics and Strength of Materials, Belgorod State Technological University Named after V.G. Shukhov, 308012 Belgorod, Russia
Nikolai Vatin: Institute of Civil Engineering, Peter the Great St. Petersburg Polytechnic University, 195251 St. Petersburg, Russia
Maria Karelina: Department of Road-Building Materials, Moscow Automobile and Road Construction University, 125319 Moscow, Russia

DOI: https://doi.org/10.3390/fib9030014
Journal volume & issue: Vol. 9, no. 3
p. 14

Abstract

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Acid treatment is commonly used to improve the dispersion of carbon nanotubes (CNT) in a cementitious matrix, but it causes undesired delay on cement hydration kinetics. This work reports a combined CNT functionalization method with H2SO4/HNO3 and Ca(OH)2 for addition in a cementitious matrix. Results showed that the Ca(OH)2 exposure neutralized the active sites generated by acid exposure, compensating the delay in hydration. As a result, CNT exposed to H2SO4/HNO3 for 9 h and further Ca(OH)2 treatment led to equivalent hydration kinetics than un-treated CNT did with improved stability.

Published in Fibers

ISSN: 2079-6439 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Chemical technology: Chemicals: Manufacture, use, etc.; Technology: Chemical technology: Textile bleaching, dyeing, printing, etc.; Science: Biology (General); Science: Physics
Website: http://www.mdpi.com/journal/fibers/

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