Abstract
The paper deals with the durability of hydrophobic layers in concrete, investigated by using non-destructive single-sided nuclear magnetic resonance (NMR). With this measuring technology, the amount and distribution of water as well as of hydrophobing agents inside the concrete can be visualised. By comparing NMR measurements of single specimen over time, changes in the hydrophobic layer properties can be seen. Results after UV radiation, alkaline storage and carbonation show the different effects of each exposure. The investigated hydrophobing agents for application on concrete were stable during long term exposure in alkaline solution. The effect of UV radiation was limited to the roll-off behaviour of the concrete surface. The results after CO2 exposure show that structural changes caused by carbonation of blast furnace slag cement based concrete decrease the hydrophobic layer thickness, while carbonation of Portland cement concrete has no influence. In addition, efficacy tests show that water transport through the affected hydrophobic layers of blast furnace slag concrete is accelerated.
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Acknowledgment
The authors thank the German Science Foundation (DFG) for funding the project “durability of hydrophobic treatments on concrete surfaces”.
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Antons, U., Raupach, M., Weichold, O. (2015). Durability of Hydrophobic Treatments on Concrete. In: Andrade, C., Gulikers, J., Polder, R. (eds) Durability of Reinforced Concrete from Composition to Protection. Springer, Cham. https://doi.org/10.1007/978-3-319-09921-7_4
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DOI: https://doi.org/10.1007/978-3-319-09921-7_4
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