Abstract
Nitrogenous strength enhancer is an organic chemical additive, which is popularly used to regulate cement hydration and improve cement properties. In this work, the effect of N, N-di(hydroxyethyl)glycine (bicine) on the hydration process and the properties of Portland cement were systematically investigated. The results obtained indicate that bicine significantly changes the morphology of portlandite crystals from a parallel-stacked lamellar shape to a distorted one and also decreases the pore size of the hardened cement paste at early age. The C–S–H phase in the hardened cement paste presents a higher Ca/Si ratio when adding bicine. Additionally, low doses of bicine can accelerate the hydration of C3A and C3S at lower dosage and promote the conversion of AFt to AFm. Thus, the mechanical performance would increase 30.9% and 13.6% at 3 d and 7 d only with 0.03% bicine, respectively. However, adding excessive bicine is not beneficial for the strength development in the early and late ages.
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Acknowledgements
The National Natural Science Foundation of China (52102020, 52172018), the Natural Science Foundation of Shandong Province (ZR2020QE047), the Doctoral Fund Project of University of Jinan (XBS2004), the authors are grateful for the financial support of the National Key Research and Development Program (2020YFB0312100ZL), the Taishan Scholars Program, the Case-by-Case Project for Top Outstanding Talents of Jinan, and the “111 Project” of International Corporation on Advanced Cement-based Materials (No. D17001). Special thanks are extended anonymous reviewers for their value comments.
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XL was involved in conceptualization, methodology, investigation, writing—original draft. JJ contributed to writing—review and editing. ZY was involved in investigation and formal analysis. PD and HC contributed to methodology and data curation. JW was involved in supervision and writing—review and editing. XC contributed to resources and investigation.
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Lu, X., Jia, J., Ye, Z. et al. The influence of bicine on the hydration and properties of Portland cement. J Therm Anal Calorim 147, 13125–13134 (2022). https://doi.org/10.1007/s10973-022-11702-z
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DOI: https://doi.org/10.1007/s10973-022-11702-z