Plastic deformation mechanism of calcium-silicate hydrates determined by deviatoric-stress Raman spectroscopy
Journal Article
·
· Cement and Concrete Research
- Univ. of California, Berkeley, CA (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Creep of the cement matrix affects the structural stability of concrete. In Portland cements, the creep is largely controlled by the binding phase calcium-(aluminum-)silicate-hydrate, or C-(A-)S-H. This phase has a lamellar structure and under deviatoric stress aligns its c-axis with the principal stress. However, the limiting resistance to this reorientation is unknown at the nanocrystalline level. Small-angle X-ray scattering shows that the lamellae thickness decreases under 100's MPa deviatoric stress. Deviatoric stress Raman spectroscopy shows that there are two ways that this break-up can occur. If the material's silicate chains are cross-linked, then strain in Si–O bonds does not increase above certain stresses, indicating a relaxation adjacent to the Si–O bond. If the chains are not cross-linked, then the silicate chains are broken up by rastering against each other, introducing defects. These results show that the plastic deformation of C-(A-)S-H is relevant for Portland cement creep.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1839019
- Alternate ID(s):
- OSTI ID: 1782308
OSTI ID: 23206261
- Journal Information:
- Cement and Concrete Research, Journal Name: Cement and Concrete Research Vol. 146; ISSN 0008-8846
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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