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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Chemo-Mechanical Properties of Cement Matrices with Fly Ash and Slag
Author(s): William Wilson, Luca Sorelli, and Arezki Tagnit-Hamou
Publication: Special Publication
Appears on pages(s): 29.1-29.14
Keywords: calcium-aluminum-silicate-hydrates (C-A-S-H); calcium-silicate-hydrates (C-S-H); fly ash (FA); ground granulated blast-furnace slag (S); microstructure; nanoindentation; SEM-EDS; statistical deconvolution; supplementary cementitious materials (SCMs)
Abstract:A better understanding of the microstructural features of cement matrices incorporating supplementary cementitious materials (SCMs) represents key knowledge for engineering more sustainable concrete infrastructures. By fostering the coupling of nanoindentation techniques with quantitative energy-dispersive Xray spectroscopy (NI-QEDS), this work aims at disclosing the effects of substituting Portland cement by 30% fly ash or 50% slag on hydrous and anhydrous phases. Notably, after one year of hydration, measurements attributed
to calcium-(aluminum)-silicate-hydrates, C-(A)-S-H, showed average Ca/(Si+Al) ratios < 1.5 for the pastes with SCMs, compared to Ca/(Si+Al) 1.9 for a Portland-cement-only paste. Interestingly, an intermix of C-(A)-S-H and hydrotalcite-like phases was also found in the slag-containing system. Nevertheless, similar micro-mechanical properties were found for these different C-(A)-S-H (modulus M 26–29 GPa [3770–4205 ksi] and hardness H 0.8–0.9 GPa [115–130 ksi]), which indicate that C-A-S-H formed by fly ash or slag reaction may replace
Portland-cement C-S-H with equivalent mechanical properties at the micrometer scale.
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