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Effect of Nanocellulose on the Mechanical and Self-shrinkage Properties of Cement Composites

나노셀룰로오스가 시멘트복합체의 역학적 특성 및 자기수축 특성에 미치는 영향

  • Kim, Sun-Woo (Dept. of Construction Engineering Education, College of Education, Chungnam National University) ;
  • Yoon, Byung-Tae (Greenhouse Gas Resources Research Group, KRICT)
  • 김선우 (충남대학교 건설공학교육과) ;
  • 윤병태 (한국화학연구원 온실가스자원화연구그룹)
  • Received : 2016.04.19
  • Accepted : 2016.07.14
  • Published : 2016.08.10

Abstract

Nanocelluloses, mainly cellulose nanofibrils (CNF) and cellulose nanocrystals (CNC, i.e., defect-free, rod-like crystalline residues after acid hydrolysis of fibers), have been the subject of recent interest. Due to the presence of hydroxyl groups on the surface of nanocelluloses, their surfaces are reactive, making them suitable candidates for reinforcing materials for manufacturing polymer composites. In this study, CNF was used as a reinforcing material for manufacturing cement composites. CNF was prepared by TEMPO (2,2,6,6,-tetramethyl piperidine-1-oxyl radical) oxidation procedure combined with extensive homogenization and ultrasonication. Transmission electron microscopy (TEM) analysis of the suspension showed the width of CNF between 10 and 15 nm. The compressive strength of cement composites containing 0.5% CNF was comparable to that of conventional cement composites. On the other hand, the tensile and flexural strength were improved by 49.7% and 38.8%, respectively, compared to those of conventional cement composites. Also, at an ambient condition, the degree of self-shrinkage reduction reached to 18.9% in one day, followed by 5.9% in 28 days after molding.

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