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Statistical nanoindentation technique in application to hardened cement pastes: Influences of material microstructure and analysis method
Hu C.2; Gao Y.3; Zhang Y.3; Li Z.2
2016-06-15
Source PublicationConstruction and Building Materials
ISSN09500618
Volume113Pages:306-316
AbstractStatistical nanoindentation technique has been widely used to study the microstructural mechanical properties of various types of hardened cement pastes, which has significantly improved the fundamental understanding on the mechanical performances of concrete and other cementitious composites. However, it was noted that the contradictory results from statistical nanoindentation technique appeared in the literatures and the critical aspects in the application of this technique to hardened cement pastes were recognized. This work is designed to provide an insight into the critical aspects, including the influences of material microstructure and statistical analysis method. Firstly, the microstructure of hardened cement pastes was investigated by SEM-BSE/EDX analysis. Then, the influence of heterogeneous material microstructure on the nanoindentation results was investigated through a micromechanical method. After that, two general methods of parameter estimation were applied to analyze the nanoindentation data and global optimal results were sought by multiple runs with the random starting values. This work revealed that the indented 'Calcium-Silicate-Hydrate' microstructure is a fact of the composites and the analysis result largely depends on the selected statistical analysis method. The influences of material microstructure and statistical analysis method may cause unreliable result. In this paper, a method for the verification of the result from statistical nanoindentation technique in hardened cement pastes was proposed.
KeywordComposition Hardened cement paste Mechanical properties Micromechanics Microstructure Statistical analysis
DOI10.1016/j.conbuildmat.2016.03.064
URLView the original
Language英語
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Cited Times [WOS]:22   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
Affiliation1.University of Toronto
2.Hong Kong University of Science and Technology
3.Southeast University
Recommended Citation
GB/T 7714
Hu C.,Gao Y.,Zhang Y.,et al. Statistical nanoindentation technique in application to hardened cement pastes: Influences of material microstructure and analysis method[J]. Construction and Building Materials,2016,113:306-316.
APA Hu C.,Gao Y.,Zhang Y.,&Li Z..(2016).Statistical nanoindentation technique in application to hardened cement pastes: Influences of material microstructure and analysis method.Construction and Building Materials,113,306-316.
MLA Hu C.,et al."Statistical nanoindentation technique in application to hardened cement pastes: Influences of material microstructure and analysis method".Construction and Building Materials 113(2016):306-316.
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