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Cellulose nanofibrils for the performance improvement of ultra-high ductility cementitious composites

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Abstract

This study explored the effect of cellulose nanofibrils (CNFs) as a binder at different weight percentages, namely, 0%, 0.05%, 0.1%, and 0.15%, on the hydration, rheology, pore structure, and mechanical properties of ultra-high ductility cementitious composites (UHDCCs). The hydration kinetics with different CNF contents were studied using isothermal calorimetry (IC), showing a retardation effect on the early hydration of UHDCCs matrices at 70 h due to adsorption of CNFs on the surface of cement particles. Thermogravimetric analysis (TGA) demonstrated that CNFs improved the degree of hydration at 28 days by facilitating transport of water into unhydrated cement cores. The two rheological parameters, namely, the yield stress and plastic viscosity, of the fresh UHDCCs matrices increased with increasing CNF content. Low-field nuclear magnetic resonance (LF-NMR) analysis, as a nondestructive method, indicated that the addition of CNFs could reduce the porosity of the UHDCCs and refine their pore size distribution, and an 8.9–46.1% increase in the compressive strength of the corresponding specimens was found. Notably, CNFs increased the tensile initial cracking stress and tensile stress of UHDCCs by 91.2% and 30.8%, respectively, and maintained or increased their tensile strain-hardening capacity by over 8%. The flexural tests also found a 54.6% increase in the initial stress and a 14.8% increase in the peak stress. As a preliminary, CNFs show crucial promise as a greener nanomaterial to improve the strength and ductility of UHDCCs.

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Acknowledgments

Research into the pore structure was performed by LF-NMR analysis at Suzhou Niumag Analytical Instrument Corporation, Jiangsu, China We are also grateful to Springer Nature for its linguistic assistance during the preparation of this manuscript.

Funding

This work was supported by the National Natural Science Foundation of China (grant nos. 52078282, 52038006 and 51908339), the China Academy of Engineering Consulting Project “Research on Development Strategy and Key Technologies of Bamboo Construction Sector in China towards 2035” (grant no. 2018-ZCQ-06) and the Program for Changjiang Scholars and Innovative Research Team from the University of China (grant no. IRT_17R69).

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Correspondence to Qiaoling Liu.

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Liang, L., Zhang, X., Liu, Q. et al. Cellulose nanofibrils for the performance improvement of ultra-high ductility cementitious composites. Cellulose 29, 1705–1725 (2022). https://doi.org/10.1007/s10570-022-04421-z

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  • DOI: https://doi.org/10.1007/s10570-022-04421-z

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