Insight on the mechanical properties of hierarchical porous calcium-silicate-hydrate pastes according to the Ca/Si molar ratio using in-situ synchrotron X-ray scattering and nanoindentation test
- Authors
- Im, Sumin; Jee, Hyeonseok; Suh, Heongwon; Kanematsu, Manabu; Morooka, Satoshi; Choe, Hongbok; Yuhei, Nishio; Machida, Akihiko; Kim, Jihoon; Lim, Seungmin; Bae, Sungchul
- Issue Date
- Feb-2023
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Calcium -silicate -hydrate (C -S -H); Synchrotron X-ray; Pair distribution function (PDF); Nanoindentation; Multiscale
- Citation
- CONSTRUCTION AND BUILDING MATERIALS, v.365, pp.1 - 18
- Indexed
- SCIE
SCOPUS
- Journal Title
- CONSTRUCTION AND BUILDING MATERIALS
- Volume
- 365
- Start Page
- 1
- End Page
- 18
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/185161
- DOI
- 10.1016/j.conbuildmat.2022.130034
- ISSN
- 0950-0618
- Abstract
- Nanocrystalline calcium–silicate–hydrate (C-S-H) is a typical heterogeneous material with a multiscale structure spanning a wide length scale from angstrom to micrometer, and whose structure is determined by the Ca/Si ratio. In this study, we directly applied compressive loads on synthetic C-S-H pastes with Ca/Si ratios of 0.6–1.2 and investigated their mechanical properties using the elastic modulus calculated at three length scale levels (i.e., angstrom to nanometer, micrometer, and millimeter) via in-situ synchrotron X-ray scattering, nanoindentation tests, and strain gauges, respectively. Further, 29Si nuclear magnetic resonance spectroscopy was conducted on the C-S-H pastes to elucidate the alterations in the silicate polymerization. The experimental results confirmed the deformation behavior of the C-S-H paste with different Ca/Si ratios under external loading, which was demonstrated to be transferred from the surface of the pastes to particles owing to the presence of multiscale pores.
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