0540578 - FZÚ 2021 RIV GB eng J - Článek v odborném periodiku
Němeček, J. Prof. - Maňák, Jan - Němeček, J. - Krejčí, T.
Effect of vacuum and focused ion beam generated heat on fracture properties of hydrated cement paste.
Cement and Concrete Composites. Roč. 100, Jul (2019), s. 139-149. ISSN 0958-9465. E-ISSN 1873-393X
Grant CEP: GA ČR(CZ) GA17-05360S
Institucionální podpora: RVO:68378271
Klíčová slova: vement * micro-beam * tensile strength * fracture energy * nanoindentation * focused ion beam * vacuum
Obor OECD: Civil engineering
Impakt faktor: 6.257, rok: 2019
Způsob publikování: Omezený přístup
Web výsledku:
https://doi.org/10.1016/j.cemconcomp.2019.03.027
DOI: https://doi.org/10.1016/j.cemconcomp.2019.03.027

The paper focuses on quantifying of vacuum and heat influence as unavoidable effects that appear during preparation and in-situ monitoring of micromechanical performance of cement pastes. Experimental tests at micrometer scale employ microscopic techniques of Scanning Electron Microscopy (SEM) and Focused Ion Beam (FIB). High vacuum is applied to samples during SEM-FIB procedures causing dessication and densification of primary cement paste constituents, the CSH gels. The effect of local heating due to ionic interactions during FIB milling is studied by means of micromechanical measurements on micro-beams and finite element (FE) numerical model. The paper also reports micromechanical response received by low energy milling for which microstructural changes due to increased temperature are restricted to very small volumes and can be assumed to be negligible with respect to the micro-beam dimensions.


Trvalý link: http://hdl.handle.net/11104/0318199