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Effects of reactive magnesia on microstructure and frost durability of portland cement-based binders
Department of Civil and Structural Engineering, Aalto University, School of Engineering, Espoo.ORCID iD: 0000-0001-6287-2240
Department of Civil and Structural Engineering, Aalto University, School of Engineering, Espoo.ORCID iD: 0000-0001-7279-6528
2013 (English)In: Journal of materials in civil engineering, ISSN 0899-1561, E-ISSN 1943-5533, Vol. 25, no 12, p. 1941-1950Article in journal (Refereed) Published
Abstract [en]

The effects of portland cement (PC) replacement with magnesia (reactive magnesium-oxide) on properties of PC-based pastes, mortars, and concretes were investigated. The research included determination of mechanical properties and frost durability in addition to studies of the microstructure and microchemistry. The mortar and paste mixtures contained from 10-80 weight percent (wt%) replacement of PC by magnesia and had water to cementitious-binder ratios from 0.4-0.7, whereas concretes contained from 5-10 wt% magnesia and had a water to cementitious-binder ratio of 0.53. Replacement of PC by magnesia had adverse effects on the mechanical properties and frost durability. The magnesia reduced microcracking of the binder matrix in comparison with pastes containing only PC. The primary hydration product of magnesia was brucite in addition to regular hydration phases of PC. The amount of formed portlandite was increased. Magnesia caused densification of the microstructure but also increased the capillary porosity, resulting in lower frost-durability. © 2013 American Society of Civil Engineers.

Place, publisher, year, edition, pages
2013. Vol. 25, no 12, p. 1941-1950
Keywords [sv]
Forst durability, Magnesia, Microstructure
National Category
Infrastructure Engineering
Research subject
Structural Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-4074DOI: 10.1061/(ASCE)MT.1943-5533.0000768ISI: 000329913900018Scopus ID: 2-s2.0-84888071299Local ID: 1efb78db-6192-44ab-96e8-5631f46614d0OAI: oai:DiVA.org:ltu-4074DiVA, id: diva2:976936
Note

Upprättat; 2013; 20160222 (andcwi)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2023-05-08Bibliographically approved

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Cwirzen, AndrzejHabermehl-Cwirzen, Karin

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