Synergistic strengthening mechanism of Portland cement paste reinforced by a triple hybrid of graphene oxide, functionalized carbon nanotube, and nano-silica
- Authors
- Kim, Gyeongryul; Suh, Hyeongwon; Cho, Seongmin; Im, Sumin; Nezhad, Erfan Zal; Seok, Seungwook; Choi, Changsik; Bae, Sungchul
- Issue Date
- Oct-2022
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Graphene oxide; Functionalized carbon nanotube; Nano-silica; Synergistic effect; Dispersion; Hydration
- Citation
- CONSTRUCTION AND BUILDING MATERIALS, v.352, pp.1 - 18
- Indexed
- SCIE
SCOPUS
- Journal Title
- CONSTRUCTION AND BUILDING MATERIALS
- Volume
- 352
- Start Page
- 1
- End Page
- 18
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/172531
- DOI
- 10.1016/j.conbuildmat.2022.129017
- ISSN
- 0950-0618
- Abstract
- This study investigates the synergistic strengthening mechanism of graphene oxide (GO), functionalized carbon nanotubes (f-CNT), and nano-silica (NS) triple hybrid-reinforced Portland cement composite. GO was selected as the variable owing to the synergistic effect of GO with both f-CNTs and NS upon dispersion by forming bonds with both nanomaterials. At a low GO dosage (similar to 0.03 wt% of cement), the bond between GO and NS deteriorated the dispersion in Ca2+-rich solution due to the overly attached NS on the GO surface. The highest GO fraction (0.05 wt%) also led to poor dispersion as the excess GO was agglomerated by Ca2+ ions. However, an optimal amount of GO (0.04 wt%) significantly improved the dispersion quality. The enhanced dispersion of the triple hybrid positively influenced the hydration degree and mechanical performance of the cement paste (133 % and 156 % for compressive and tensile splitting strength compared to OPC) and the pozzolanic reactivity of NS.
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