Effect of Multiwalled Carbon Nanotube Functionalization with 3-Aminopropyltriethoxysilane on the Rheology and Early-Age Hydration of Portland Cement Pastes
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 8
Abstract
The mechanical performance of cementitious materials can be improved by incorporating carbon nanotubes (CNTs). Nevertheless, some challenges must be overcome, such as reducing the agglomeration trend of CNTs and minimizing their negative effect on the fresh state of the cementitious matrices. In this study, early-age portland cement (PC) hydration and the rheological behavior of cementitious composites with nonsilanized, 3-aminopropyltriethoxysilane (APTES)-functionalized CNTs were investigated. The APTES-functionalized CNTs were incorporated into PC pastes in contents of 0.05% and 0.1% by cement weight. The rotational rheometry of the CNT cementitious composites was carried out during the first hour of hydration. The effect of CNT silanization on cement hydration was assessed using isothermal calorimetry and in situ X-ray diffraction (XRD) for 48 h. The functionalization of CNTs with APTES offset the negative effect of nonsilanized CNTs on the fresh properties of the cementitious matrix, reducing the dynamic yield stress up to 39%. Calorimetry and in situ XRD results revealed that nonsilanized CNTs hindered early cement hydration, while the APTES-treated CNTs allowed proper hydration. At 28 days, the XRD and thermogravimetric analysis (TGA) results indicated that nonsilanized and silane-treated CNTs showed an equivalent hydration degree compared to the plain cement paste. Overall, CNT silanization improved the early age performance of cement pastes, enhanced the fresh properties of cement pastes, and did not affect the early hydration of PC.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
National Council for Scientific and Technological Development (CNPq), Santa Catarina Research Foundation (FAPESC), and Coordination for the Improvement of Higher Education Personnel (CAPES) are acknowledged for providing financial support for this research. LabMat (UFSC) and Ms. Patrícia Prates are acknowledged for the SEM analysis. X-Ray Diffraction Laboratory (LDRX-UFSC) is acknowledged for in situ XRD analysis. LCME (UFSC) is acknowledged for TEM analysis. The authors are also grateful to the Central de Análises of the Chemistry Department for the TGA analysis. Paulo de Matos (UFSM) is acknowledged for his assistance in rheology and in situ XRD analyses.
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Journal of Materials in Civil Engineering
Volume 34 • Issue 8 • August 2022
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Received: Sep 8, 2021
Accepted: Dec 9, 2021
Published online: May 24, 2022
Published in print: Aug 1, 2022
Discussion open until: Oct 24, 2022
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