Zhu, X and Richardson, IG orcid.org/0000-0002-4340-7121 (2023) Morphology-structural change of C-A-S-H gel in blended cements. Cement and Concrete Research, 168. 107156. ISSN 0008-8846
Abstract
Pastes of white Portland cement (wPC) and wPC-30 % pulverized fuel ash (PFA), -60 % ground granulated blast furnace slag (GGBS), -30 % or 60 % inert filler (anatase-type TiO2) blends were prepared to investigate the dominant factors for morphological change of outer product (OP) C-A-S-H gel in blended cement systems. The OP C-A-S-H gel in SCMs-blended cements changes its morphology from fibrillar-like to mixed fine-fibrillar/foil-like when its Ca/(Si + Al) ratio < 1.30 and Al/Si ratio > 0.15. Meanwhile, the fine-fibrillar/foil-like C-A-S-H has the mean length of the aluminosilicate chain longer than 7– 8, of which, the [SiO4] bridging site occupancy factor (SOFBT) is higher than 0.6 and the [AlO4] SOFBT is higher than 0.3. The pore solutions show the characteristics of effective saturation index (ESI) of CH < −0.15 and ESI of jennite-based C-S-H gel < 0.10. The morphology of C-A-S-H gel in inert filler blends remains fibrillar throughout the hydration.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2023 The Authors. This is an open access article under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited. |
Keywords: | SCMs, Morphology, C-A-S-H gel, Nano-structural change |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Civil Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 25 Apr 2023 10:10 |
Last Modified: | 25 Jun 2023 23:19 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.cemconres.2023.107156 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:198531 |