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Pair distribution function analysis of nanostructural deformation of calcium silicate hydrate under compressive stress
Author(s) -
Bae Sungchul,
Jee Hyeonseok,
Kanematsu Manabu,
Shiro Ayumi,
Machida Akihiko,
Watanuki Tetsu,
Shobu Takahisa,
Suzuki Hiroshi
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15185
Subject(s) - deformation (meteorology) , materials science , hydrate , calcium silicate hydrate , silicate , phase (matter) , strain (injury) , stress (linguistics) , composite material , mineralogy , crystallography , compressive strength , compression (physics) , chemical engineering , chemistry , cement , medicine , linguistics , philosophy , organic chemistry , engineering
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 (C 3 S) paste as a function of applied stress by interpreting atomic pair distribution function ( PDF ) based on in situ X‐ray scattering. Three different strains in C 3 S 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 Å whereas crystalline phases dominated that beyond 20 Å. 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 Å 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.