Pair distribution function analysis of nanostructural deformation of calcium silicate hydrate under compressive stress
- Title
- Pair distribution function analysis of nanostructural deformation of calcium silicate hydrate under compressive stress
- Author
- 배성철
- Keywords
- calcium silicate hydrate; deformation; portland cement; X-ray methods
- Issue Date
- 2018-02
- Publisher
- WILEY
- Citation
- JOURNAL OF THE AMERICAN CERAMIC SOCIETY, v. 101, no. 1, page. 408-418
- Abstract
- Despite enormous interest in calcium silicate hydrate (C-S-H), its detailed atomic structure and intrinsic deformation under an external load are lacking. This study demonstrates the nanostructural deformation process of C-S-H in tricalcium silicate (C3S) paste as a function of applied stress by interpreting atomic pair distribution function (PDF) based on insitu X-ray scattering. Three different strains in C3S paste under compression were compared using a strain gauge, Bragg peak shift, and the real space PDF. PDF refinement revealed that the C-S-H phase mostly contributed to PDF from 0 to 20 angstrom whereas crystalline phases dominated that beyond 20 angstrom. The short-range atomic strains exhibited two regions for C-S-H: I) plastic deformation (0-10 MPa) and II) linear elastic deformation (>10 MPa), whereas the long-range deformation beyond 20 angstrom was similar to that of Ca(OH)(2). Below 10 MPa, the short-range strain was caused by the densification of C-S-H induced by the removal of interlayer or gel-pore water. The strain is likely to be recovered when the removed water returns to C-S-H.
- URI
- https://ceramics.onlinelibrary.wiley.com/doi/abs/10.1111/jace.15185https://repository.hanyang.ac.kr/handle/20.500.11754/117677
- ISSN
- 0002-7820; 1551-2916
- DOI
- 10.1111/jace.15185
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > ARCHITECTURAL ENGINEERING(건축공학부) > Articles
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