Analysis of atomistic structural deformation characteristics of calcium silicate hydrate in 53-year-old tricalcium silicate paste using atomic pair distribution function
- Authors
- Bae, Sungchul; Jee, Hyeonseok; Suh, Heongwon; Kanematsu, Manabu; Shiro, Ayumi; Machida, Akihiko; Watanuki, Tetsu; Shobu, Takahisa; Morooka, Satoshi; Geng, Guoqing; Suzuki, Hiroshi
- Issue Date
- Mar-2020
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Atomistic structure; C-S-H; Deformation; X-ray scattering; Pair distribution function
- Citation
- CONSTRUCTION AND BUILDING MATERIALS, v.237, pp.1 - 10
- Indexed
- SCIE
SCOPUS
- Journal Title
- CONSTRUCTION AND BUILDING MATERIALS
- Volume
- 237
- Start Page
- 1
- End Page
- 10
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/146111
- DOI
- 10.1016/j.conbuildmat.2019.117714
- ISSN
- 0950-0618
- Abstract
- Although the atomistic structure and the deformation characteristics of calcium silicate hydrates (C-S-H) are of primary interest in cement chemistry, they have not been fully investigated. In this study, pair distribution function (PDF) analysis was conducted on a 53-year-old fully hydrated tricalcium silicate (C3S) paste using in situ synchrotron high-energy X-ray scattering to probe the atomic structural deformation of C-S-H under external loading. The results were compared with those from our previous PDF study of a 131-day-old C3S paste in order to elucidate the effect of aging on the mechanical characteristics of C-S-H. Three different strains measured by the strain gauge, by the lattice shifts (d-spacing) in the reciprocal space, and by the shift of the interatomic distance (r) in the real space were compared. In the range of r < 20 angstrom, where most of the information was derived from C-S-H, the 53-year-old C3S paste had a higher overall elastic modulus (18.3 GPa) and better resistance to compressive stress than the 131-day-old C3S paste (elastic modulus: 8.3 GPa). Moreover, it was found that the macroscopic strains of the 53-year-old C3S paste were presumably induced by mechanical deformation such as microcracks at the macroscale. The results provide experimental evidence for the atomistic and mesoscale mechanical behavior of C-S-H in the early and late ages.
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