Influence of Nanofibrillated Bacterial Cellulose on the Properties of Ordinary and Expansive Mortars

Emika Kuroiwa; Nguyen Xuan Quy; Yukio Hama

doi:10.3390/ma15062094

Influence of Nanofibrillated Bacterial Cellulose on the Properties of Ordinary and Expansive Mortars

Materials (Basel). 2022 Mar 11;15(6):2094. doi: 10.3390/ma15062094.

Authors

Emika Kuroiwa¹, Nguyen Xuan Quy², Yukio Hama³

Affiliations

¹ Division of Sustainable and Environmental Engineering, Muroran Institute of Technology, Muroran 050-8585, Japan.
² Faculty of Civil Engineering, Hanoi Architectural University, Hanoi 100000, Vietnam.
³ Graduate School of Engineering, College of Environmental Technology, Muroran Institute of Technology, Muroran 050-8585, Japan.

Abstract

This study uses two types of nanofibrillated bacterial cellulose (NFBC), a culture solution containing NFBC (B_f) and a purified solution (P_f), to investigate the influence of NFBC on the basic properties of mortar. The flow test, air content test, setting time test, restraint expansion test, dry shrinkage test, strength test and freeze-thaw test were performed. The results show that the flow of fresh mortar increases for B_f and decreases for P_f, while the setting time of mortar is delayed for B_f. The dry shrinkage is slightly decreased as a result of using NFBC in expansive mortar. In addition, for both types of NFBC, the strength is not significantly affected in ordinary mortar, while the compressive strength tends to increase slightly after 28 days of underwater curing in expansive mortar. Moreover, the frost resistance improves as the air content increases in ordinary mortar. In expansive mortar, the frost resistance is improved for B_f, but the frost resistance is not improved for P_f. This investigation has revealed that NFBC can be used as an admixture to improve the properties of mortar, such as frost resistance.

Keywords: compressive strength; curing conditions; expansive additive; frost resistance; nanofibrillated bacterial cellulose; setting time.