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Time-dependent autogenous shrinkage of shotcrete with alkaline and alkali-free accelerators

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Abstract

The time-dependent autogenous shrinkage of shotcrete under different alkali content and dosage of accelerators was tested. The adiabatic temperature rise, microstructure, chemical compound, and mercury injection test were characterized to determine the influence of accelerators on the autogenous shrinkage of shotcrete. The previous theoretical model for shrinkage was improved by introducing the influence factor of expansive hydration products. An autogenous shrinkage prediction model suitable for shotcrete was proposed, and the relevant model parameters were calibrated based on experimental results. Compared with the control group, alkali-free or alkaline accelerator significantly accelerates the autogenous shrinkage of shotcrete, which is mainly due to the accelerating effect on the hydration process at an early age and the free water absorption in the hydration process; Compared with the alkaline accelerator, alkali-free accelerator generates a large amount of expansive hydration product Ettringite. Therefore the autogenous shrinkage of shotcrete with alkali-free accelerator was smaller than that with alkaline accelerator. By introducing the influence factor \(p_{1}\) the previous shrinkage model was improved. The new model can better describe the influence of expansive hydration products generated by accelerators on the shrinkage of shotcrete. The theoretical model is suitable to investigate the shrinkage development of the initial tunnel support structures.

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Acknowledgement

This work has been supported by grants from the National Science Foundation of China (No. 51908551, U1934206), the National Key Research and Development Program of China (2020YFC1909900), and the Scientific Research Project of China Academy of Railway Sciences Group Co., Ltd (2021YJ173).

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Authors and Affiliations

  1. China Academy of Railway Sciences Corporation Limited, Railway Engineering Research Institution, Beijing, 100081, China

    Jiahe Wang, Huajian Li, Yanbin Tan, Linxiang Li, Yanan Qu & Yongjiang Xie

  2. State Key Laboratory for Track Technology of High-speed Railway, Beijing, 100081, China

    Jiahe Wang, Huajian Li, Yanbin Tan, Linxiang Li, Yanan Qu & Yongjiang Xie

Authors
  1. Jiahe Wang
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  2. Huajian Li
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  3. Yanbin Tan
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  4. Linxiang Li
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  6. Yongjiang Xie
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Contributions

Jiahe Wang wrote the main manuscript text; Huajian Li and Yanbin Tan participated in the experiments and theoretical research; Linxiang Li, Yanan Qu and Yongjiang Xie revised the manuscript. All authors reviewed the manuscript.

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Wang, J., Li, H., Tan, Y. et al. Time-dependent autogenous shrinkage of shotcrete with alkaline and alkali-free accelerators. Mech Time-Depend Mater 27, 605–628 (2023). https://doi.org/10.1007/s11043-023-09593-0

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  • DOI: https://doi.org/10.1007/s11043-023-09593-0

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