Combined influence of carbonation and leaching on freeze-thaw resistance of limestone ternary cement concrete

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F21%3A00356216" target="_blank" >RIV/68407700:21110/21:00356216 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1016/j.conbuildmat.2021.125087" target="_blank" >https://doi.org/10.1016/j.conbuildmat.2021.125087</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.conbuildmat.2021.125087" target="_blank" >10.1016/j.conbuildmat.2021.125087</a>

Result language
angličtina
Original language name
Combined influence of carbonation and leaching on freeze-thaw resistance of limestone ternary cement concrete
Original language description
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.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20101 - Civil engineering

Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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