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Advances in Concrete Construction
  Volume 8, Number 4, December 2019 , pages 311-320

Fire resistance evaluation of fiber-reinforced cement composites using cellulose nanocrystals
Hyung-Joo Lee, Seung-Ki Kim, Heon-Seok Lee, Yong-Hak Kang, Woosuk Kim and Thomas H.-K. Kang

    In this study, the effect of cellulose nanocrystals (CNCs) on the fire resistance properties of fiber-reinforced cement composites was investigated. The main variables were CNCs content (0.4, 0.8 and 1.2vol.% compared with cement), steel fiber ratio, and exposure temperature (100, 200, 400, 600 and 800oC). The fire resistance properties, i.e., residual compressive strength, flexural strength, and porosity, were evaluated in relation with the exposure temperature of the specimens. The CNCs suspensions were prepared to composited dispersion method of magnetic stirring and ultra-sonication. CNCs are effective for increasing the compressive strength at high temperatures but CNCs do not seem to have a significant effect on flexural reinforcement. Porosity test result showed CNCs reduce the non-hydration area inside the cement and promote hydration.
Key Words
    Cellulose Nanocrystals (CNCs); fire resistance; porosity; residual strength; microstructure
Hyung-Joo Lee, Seung-Ki Kim, Heon-Seok Lee, Woosuk Kim: Department of Architectural Engineering, Kumoh National Institute of Technology, 61 Daehak-ro, Gumi, Gyeongsangbuk-do 39177, Republic of Korea
Yong-Hak Kang: Daegu & Gyeongbuk Branch, Korea Conformity Laboratories, Daegu 42994, Republic of Korea
Thomas H.-K. Kang: Department of Architecture & Architectural Engineering, Seoul National University, Seoul 08826, Republic of Korea

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