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Cementitious materials limitations for concrete exposed to deicing salt plus repeated cycles of freezing and thawing
University of Washington, USA.
RISE Research Institutes of Sweden, Built Environment, Infrastructure and concrete technology.
LaFarge PNW/Holcim North America, USA.
SLU Swedish University of Agricultural Sciences, Sweden.
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2023 (English)In: ce/papers, Vol. 6, no 6, p. 1168-1172Article in journal (Refereed) Published
Abstract [en]

Reducing the carbon footprint of concrete generally involves reducing the amount of calcium oxide in the cementitous materialsbyblending flyashand/or ground limestone into the cement or by replacing some of the cement with supplementary cementitious materials. This increasesthe ratio of SiO2+Al2O3+Fe2O3to CaO+MgO in the cementitious material.While reducing the CaOcontent of cementitious ma-terials is good for the environment, it may not be good for concrete exposed to de-icing salts plus repeatedcycles of freezing and thawing due to the effect of carbon-ation. Though carbonation can refine the pore structure when using only portland cement, it coarsens the pore structure when using high levels of cement replace-ment.This leads to increased scaling potential.A review of theeffects of different cementitious materials combinations on carbonationalong with an examina-tion offield performance ofconcrete exposed to deicing salt plus repeated cycles of freezing and thawingis used to developa relationship based on the ratio of SiO2+Al2O3+Fe2O3to CaO+MgOin order to determine when limitations on cement replacement, or additional protective measures may be needed when scaling is a concern

Place, publisher, year, edition, pages
2023. Vol. 6, no 6, p. 1168-1172
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-70951DOI: 10.1002/cepa.2946OAI: oai:DiVA.org:ri-70951DiVA, id: diva2:1831380
Available from: 2024-01-25 Created: 2024-01-25 Last updated: 2024-01-25Bibliographically approved

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Helsing, Elisabeth

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