Chloride intrusion and freeze-thaw resistance of self-compacting concrete with two different nano-SiO2

G. Quercia Bianchi, P.R. Spiesz, G. Hüsken, H.J.H. Brouwers

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Abstract

In this study two different types of nano-SiO2 were applied in self-compacting concrete (SCC), both having similar particle size distributions (PSD) but produced in two different processes (pyrogenic and colloidal precipitation). The influence of nano-SiO2 on transport phenomena in SCC was investigated using the accelerated rapid chloride migration test at different ages (28 and 91 days) as well as the long-term diffusion test. The freeze-thaw resistance, expressed by the scaling factor (Sn), was also studied. Additionally, the microstructural characteristics of the hardened concretes were investigated by FEG-SEM and MIP analyses. The obtained results demonstrate that the addition of 3.8% bwoc of nano-SiO2 improves the SCC durability due to the refinement of the microstructure and the reduction in the connectivity of the pores. Additionally, a small difference in the reactivity of both types of applied nano-SiO2 additives was demonstrated.
Original languageEnglish
Title of host publicationProceedings of the 18th International Conference on Building Materials (IBAUSIL 2012), 12. bis 15. September, Weimar, Germany
EditorsH.-B. Fischer, K.-A. Bode, C. Beuthan
Place of PublicationWeimar, Germany
PublisherBauhaus-Universität Weimar
Pages2-0123-2-0136
ISBN (Print)978-3-00-034075-8
Publication statusPublished - 2012
Event18. Internationale Baustofftagung "ibausil", 12.-15. September 2012, Weimar, Deutschland - Weimar, Germany
Duration: 12 Sep 201215 Sep 2012

Conference

Conference18. Internationale Baustofftagung "ibausil", 12.-15. September 2012, Weimar, Deutschland
CountryGermany
CityWeimar
Period12/09/1215/09/12

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