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Properties and performance of silane: blended cement systems
RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
2013 (English)In: Materials and Structures, ISSN 1359-5997, E-ISSN 1871-6873, Vol. 46, no 9, 1429-1439 p.Article in journal (Refereed)
Abstract [en]

The paper presents the results of a study dealing with the performance of water repellents on hardened blended cement pastes. Since on the European market Portland cement does not play the dominant role anymore and due to the new national and European policies concerning Greenhouse Gases and sustainability, cement manufacturers produce more and more blended cements (CEM II-CEM V). Nevertheless, the majority of experience concerning the efficacy of water repellents is gained from Portland cement; therefore knowledge in regard to the interactions of blended cement with water repellent agent is minimal. Two silane-based products were applied on 'fresh' and carbonated cement substrates containing limestone, fly ash, slag and trass, and were investigated in terms of their functionality. The evaluation of the treatments' performance and effectiveness were assessed using various laboratory measurements. Hydrophobicity, water absorption, colour changes and the penetration depth of silanes into the substrate were evaluated before and after artificial aging experiments. Moreover, the outdoor weathering test was performed to shed light on treated surface appearance in a 'real' outdoor environment. The results showed that surface wettability was independent on water ingress or colour variations, especially for cement specimens artificially aged by accelerated carbonation. Cement pastes containing slag and trass seemed to more distinctly affect the water repellents' surface performance.

Place, publisher, year, edition, pages
2013. Vol. 46, no 9, 1429-1439 p.
Keyword [en]
Aging, Blended cement, Carbonation, Durability, Fly ash, Impregnation, Silanes, Water repellents
National Category
Other Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-2724DOI: 10.1617/s11527-012-9984-1Local ID: 3989OAI: oai:DiVA.org:ri-2724DiVA: diva2:960327
Available from: 2016-09-07 Created: 2016-09-07 Last updated: 2017-11-21Bibliographically approved

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