Adu-Amankwah, S orcid.org/0000-0002-0568-2093, Zajac, M, Skoček, J et al. (3 more authors) (2021) Combined influence of carbonation and leaching on freeze-thaw resistance of limestone ternary cement concrete. Construction and Building Materials, 307. 125087. ISSN 0950-0618
Abstract
Performance of OPC and composite cements including limestone ternary blended concretes and pastes exposed to natural carbonation, leaching, and freeze-thaw (FT) cycles and their coupling were investigated. The combined regime is analogous to the Capillary suction, internal damage and Freeze-thaw (CIF) test. The freeze-thaw test results showed that composite cement concretes are more susceptible to surface scaling and internal damage. Microanalysis of complementary cement pastes revealed partial carbonation after equilibration at 65% RH. Decalcification due to leaching accompanied capillary suction, profound in the partially carbonated ternary cement pastes such that portlandite was depleted from the surface before the FT cycles commenced. Successive cycles increased porosity; heterogeneity and coarsening of the pore structures were drastic when carbonation and leaching preceded FT, modifying the C-S-H morphology and composition. Curtailing carbonation and leaching reduced surface scaling and internal damage to comparable levels as OPC of the same strength class. These findings imply that changes in porosity and phase assemblage in composite cements caused by carbonation and leaching contributed to their FT susceptibility.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2021 Elsevier Ltd. All rights reserved. This is an author produced version of an article published in Construction and Building Materials. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Limestone ternary cement; Carbonation; Leaching; Freeze-thaw resistance; Durability; Microstructure |
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: | 11 Oct 2021 10:36 |
Last Modified: | 08 Oct 2022 00:15 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.conbuildmat.2021.125087 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:179012 |
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