Bonding Time and Prestress Loss in Precast Pretensioned Concrete during Steam Curing
Publication: Journal of Structural Engineering
Volume 148, Issue 3
Abstract
During steam curing of concrete, the axial restraint of pretensioned strands causes thermal prestress loss of the strands accumulated until sufficient bonding occurs. A theoretical model is presented in this paper to predict the progressive slippage of strands with time, bonding time, and the amount of thermal prestress loss. The model incorporating the equivalent age-dependent local bond-slip relationships considers the effects of material-related factors, the layout of the prestressing system, and changes in the temperature. Three pairs of two monostrand pretensioned concrete prisms were fabricated to validate the developed model. The model was able to trace the experimentally measured progressive slippage of the strand reasonably well, and it predicted thermal prestress losses by 5.2%–5.5% of the initial prestress of 1,395 MPa for the tested prisms.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2020R1A6A3A01100227).
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Published In
Journal of Structural Engineering
Volume 148 • Issue 3 • March 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Feb 21, 2020
Accepted: Nov 3, 2021
Published online: Jan 7, 2022
Published in print: Mar 1, 2022
Discussion open until: Jun 7, 2022
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- Thermal Prestress Losses in Normal- and High-Early-Strength Concrete, ACI Structural Journal, 10.14359/51736114, 119, 6, (2022).