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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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.
Originele taal-2Engels
TitelProceedings of the 18th International Conference on Building Materials (IBAUSIL 2012), 12. bis 15. September, Weimar, Germany
RedacteurenH.-B. Fischer, K.-A. Bode, C. Beuthan
Plaats van productieWeimar, Germany
UitgeverijBauhaus-Universität Weimar
Pagina's2-0123-2-0136
ISBN van geprinte versie978-3-00-034075-8
StatusGepubliceerd - 2012
Evenement18. Internationale Baustofftagung "ibausil", 12.-15. September 2012, Weimar, Deutschland - Weimar, Duitsland
Duur: 12 sep 201215 sep 2012

Congres

Congres18. Internationale Baustofftagung "ibausil", 12.-15. September 2012, Weimar, Deutschland
Land/RegioDuitsland
StadWeimar
Periode12/09/1215/09/12
Ander18th Ibausil, International Conference on Building Materials (Internationale Baustofftagung)

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