Richardson, IG, Girão, AV, Taylor, R et al. (1 more author) (2016) Hydration of water- and alkali-activated white Portland cement pastes and blends with low-calcium pulverized fuel ash. Cement and Concrete Research, 83. pp. 1-18. ISSN 0008-8846
Abstract
Pastes of white Portland cement (wPc) and wPc-pulverized fuel ash (pfa) blends were studied up to 13 years. The reaction of wPc with water was initially retarded in the presence of pfa particles but accelerated at intermediate ages. Reaction with KOH solution was rapid with or without pfa. A universal compositional relationship exists for the C-A-S-H in blends of Pc with aluminosilicate-rich SCMs. The average length of aluminosilicate anions increased with age and increasing Al/Ca and Si/Ca; greater lengthening in the blends was due to additional Al3+ at bridging sites. The morphology of outer product C-A-S-H was always foil-like with KOH solution, regardless of chemical composition, but with water it had fibrillar morphology at high Ca/(Si+Al) ratios and foil-like morphology started to appear at Ca/(Si+Al) ≈1.2-1.3, which from the literature appears to coincide with changes in the pore solution. Foil-like morphology cannot be associated with entirely T-based structure.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2016 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/) |
Keywords: | Calcium-Silicate-Hydrate (C-S-H); TEM; Hydration; Fly ash; Retardation |
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) |
Funding Information: | Funder Grant number EPSRC (Engineering and Physical Sciences Research Council) GR/S45874/01 Castle Cement Ltd PL/5931 Nirex Ltd T/LTR/404572 DC 05 45 Lafarge NONE GIVEN. Castle Cement Ltd N/A Nuclear Decommissioning Authority NR 3374 Nirex Ltd NPO0785 (PURCHASE ORDER) |
Depositing User: | Symplectic Publications |
Date Deposited: | 16 Feb 2016 11:16 |
Last Modified: | 03 Mar 2020 14:13 |
Published Version: | http://dx.doi.org/10.1016/j.cemconres.2016.01.008 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.cemconres.2016.01.008 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:95157 |