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 language | English |
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| Title of host publication | Proceedings of the 18th International Conference on Building Materials (IBAUSIL 2012), 12. bis 15. September, Weimar, Germany |
| Editors | H.-B. Fischer, K.-A. Bode, C. Beuthan |
| Place of Publication | Weimar, Germany |
| Publisher | Bauhaus-Universität Weimar |
| Pages | 2-0123-2-0136 |
| ISBN (Print) | 978-3-00-034075-8 |
| Publication status | Published - 2012 |
| Event | 18. Internationale Baustofftagung "ibausil", 12.-15. September 2012, Weimar, Deutschland - Weimar, Germany Duration: 12 Sept 2012 → 15 Sept 2012 |
Conference
| Conference | 18. Internationale Baustofftagung "ibausil", 12.-15. September 2012, Weimar, Deutschland |
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| Country/Territory | Germany |
| City | Weimar |
| Period | 12/09/12 → 15/09/12 |