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The Influence of Age and Temperature on the Bond Behaviour between Prestressing Strands and UHPC

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Abstract:

Applications of precast elements made of UHPC have been increasing in recent years. Also in the Czech Republic, UHPC can be found as a structural material in first applications in both, buildings and transport structural engineering. Structures made from this modern material required experimental programs verification of material properties and also for determination of behaviour of structural elements. In previous research of the bond of UHPC and various types of reinforcement was proven to be very good, which makes it possible to reduce radically anchorage lengths. This paper deals in more detail with determination of the bond of prestressing strands and UHPC, during the first week after casting, in particular. For prestressing of precast elements, there are very important short-time strengths and short-time bond is showing to be a decisive factor for optimum prestressing time. Second part of the paper is focused on impact of thermal stress on bond of prestressing strands and UHPC. Samples were subjected to the cycling heat/frost and effect of a number of cycles on final bond behaviour of both UHPC and ordinary concrete were investigated. The article describes differences between ordinary concrete and UHPC.

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Periodical:

Advanced Materials Research (Volume 1106)

Pages:

25-28

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1106.25

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Online since:

June 2015

Authors:

David Citek*, Tomáš Mandlík, Jiří Kolisko, Jan L. Vitek, Stanislav Rehacek

Keywords:

Bond, Reinforcement, Short-Time Bond Strengths, Temperature, UHPC

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© 2015 Trans Tech Publications Ltd. All Rights Reserved

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References

[1] Čítek, D., Vítek, J.L., Kolísko, J., Huňka, P., Řeháček, S.: Assessment of Bond Behaviour of UHPC and Prestressing Strands In.: Advanced Materials Research, Vol 1000, pp.247-250, Trans Tech Publications, Switzerland, (2014).

DOI: 10.4028/www.scientific.net/amr.1000.247

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[2] Čítek, D., Kolísko, J., Vítek, J.L., Huňka, P.: Vliv kotevní délky na soudržnost předpínací výztuže a UHPC, Sborník 12. Konference Technologie Betonu, ČBS, Jihlava, 2014, ISBN 978-80-903806-4-6 (In Czech).

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