期刊
CEMENT AND CONCRETE RESEARCH
卷 107, 期 -, 页码 317-336出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2018.02.010
关键词
Microstructure; Micromechanics; Nanoindentation; Quantitative EDS; Supplementary cementitious materials; Glue powder; Metakaolin
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC) [RGPIN-2016-05985, 6636-438380-2013]
- Research Center on Concrete Infrastructure (CRIB)
Current demand for novel highly sustainable concrete urges improving the links between chemical and mechanical effects of supplementary cementitious materials (SCMs) on the microstructure of blended-cement pastes. In this work, coupled Nanolndentation and Quantitative Energy Dispersion Spectroscopy (NI-QEDS) was applied to disclose chemo-mechanical properties of microstructure phases in systems incorporating typical dosages of fly ash, slag, metakaolin, or glass powder. For a fixed water-to-binder ratio of 0.4, the C-(A)-S-H chemistry was significantly affected by the SCMs, while its average mechanical properties varied within the limited ranges M approximate to 25-27 GPa, H approximate to 0.7-0.8 GPa and C approximate to 180-230 GPa. The SCMs further changed the arrangement of anhydrous phases and minor hydrates embedded in the C-(A)-S-H matrix, which were also characterized (e.g., Portlandite, AFm such as carboaluminates, or an hydrotalcite-like phase). Finally, engineering properties of blended-cement matrices requires tailoring both the intermix of hydrates and the rigid anhydrous SCM inclusions.
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