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Hydration, microstructure and autogenous shrinkage behaviors of cement mortars by addition of superabsorbent polymers

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Abstract

Superabsorbent Polymer (SAP) has emerged as a topic of considerable interest in recent years. The present study systematically and quantitively investigated the effect of SAP on hydration, autogenous shrinkage, mechanical properties, and microstructure of cement mortars. Influences of SAP on hydration heat and autogenous shrinkage were studied by utilizing TAM AIR technology and a non-contact autogenous shrinkage test method. Scanning Electron Microscope (SEM) was employed to assess the microstructure evolution. Although SAP decreased the peak rate of hydration heat and retarded the hydration, it significantly increased the cumulative heat, indicating SAP helps promote the hydration. Hydration promotion caused by SAP mainly occurred in the deceleration period and attenuation period. SAP can significantly mitigate the autogenous shrinkage when the content ranged from 0 to 0.5%. Microstructure characteristics showed that pores and gaps were introduced when SAP was added. The microstructure difference caused by SAP contributed to the inferior mechanical behaviors of cement mortars treated by SAP.

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Acknowledgements

The authors would like to thank the financial sponsorship provided by the National Natural Science Foundation of China (Grant No. 51778638). The contents of this paper reflect the views of the authors, who are responsible for the facts and the accuracy of the data presented herein, and do not necessarily reflect any official views or policies. The first author would also like to thank the China Scholarship Council (CSC) for their support.

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Authors and Affiliations

  1. School of Civil Engineering, Central South University, Changsha, 410075, China

    Beibei Sun, Hao Wu, Weimin Song, Zhe Li & Jia Yu

  2. Magnel Laboratory for Concrete Research, Department of Structural Engineering, Ghent University, Ghent, 9052, Belgium

    Beibei Sun

  3. National Engineering Laboratory for High Speed Railway Construction, Central South University, Changsha, 410075, China

    Hao Wu

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  1. Beibei Sun
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  2. Hao Wu
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  3. Weimin Song
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  4. Zhe Li
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  5. Jia Yu
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Correspondence to Weimin Song.

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Sun, B., Wu, H., Song, W. et al. Hydration, microstructure and autogenous shrinkage behaviors of cement mortars by addition of superabsorbent polymers. Front. Struct. Civ. Eng. 14, 1274–1284 (2020). https://doi.org/10.1007/s11709-020-0656-x

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  • DOI: https://doi.org/10.1007/s11709-020-0656-x

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