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Effects of curing temperature and superabsorbent polymers on hydration of early-age cement paste containing a CaO-based expansive additive

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Abstract

The early-age shrinkage can easily result in crack of concrete in the early age, which seriously affects the durability of concrete. The CaO-based expansion additive is a normally used and effective material for the shrinkage compensation and the reduction of early-age crack risk in concrete. The hydration is a factor that significantly influences the mechanical and durability properties of concrete, and the study on the hydration of the cement paste containing a CaO-based expansive additive under different curing temperature and with superabsorbent polymers addition is lacking. In this study, tests were conducted using the low-field nuclear magnetic resonance to assess the effect of curing temperature and superabsorbent polymers on the hydration of early-age cement paste containing a CaO-based expansion additive. The experimental results show that the incorporation of CaO-based expansive additive can promote the hydration of cement paste, and 2% dosage of CaO-based expansive additive has a better promotion than that of 3% dosage. High curing temperature can effectively accelerate the hydration of cement paste containing the CaO-based expansion additive. In addition, superabsorbent polymers can also effectively promote hydration.

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Acknowledgements

The authors gratefully acknowledge the financial supports from the National Natural Science Foundation of China under Grant Nos. 51878245, 51438003, 51578268 and 51708483, the Scientific research project of Department of Education Anhui Province under Grant No. KJ2017B01.

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Correspondence to Haitao Zhao.

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Zhao, H., Jiang, K., Di, Y. et al. Effects of curing temperature and superabsorbent polymers on hydration of early-age cement paste containing a CaO-based expansive additive. Mater Struct 52, 108 (2019). https://doi.org/10.1617/s11527-019-1407-0

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