Cement-Based Composites Reinforced with Nanofibrillated Cellulose from Bamboo Organossolv Pulp

Autor(es)

Correia, Viviane da Costa ; Savastano, Holmer, Jr. ; Ghavami, K ; Franco, PJH

• Tipo de documento: Artigo Científico
• Fonte: NON-CONVENTIONAL MATERIALS AND TECHNOLOGIES: NOCMAT FOR THE XXI CENTURY; v. 7, p. 9-pg., 2018-01-01.

Resumo

Nanofibrillated cellulose has good mechanical performance and high specific surface, which contributes to improve the adhesion between fiber and matrix. The use of cellulose nanofibres as reinforcement of cementitious materials may contribute for improving particle packing, as consequence it helps to decrease porosity and crack growth rate at nanoscale, with corresponding strengthening of the composite. Thus, the aim of this work was to study the effect of 1%, 2% and 3% (by weight) of bamboo nanofibrillated cellulose as reinforcement of cementitious composites in comparison to composites reinforced with 8% of bamboo pulp. The cementitious composites were produced by slurry-dewatering method and they were subjected to physical, mechanical e microstructural analyses at 8 days of age. The results indicated that on average 3% of nanofibrillated cellulose showed higher strength than composites reinforced with 1% and 2% of fibers. Modulus of rupture of composites reinforced with 8% of bamboo pulp was lower than composites reinforced with nanofibrillated cellulose. In relation to toughness, composites reinforced with nanofibrillated cellulose were more fragile than composites reinforced with pulp. This is due to the lower amount of nanofibrillated cellulose used as reinforcement, and due to the lower length of these fibers in comparison to pulp fibers, which reduces the pull-out energy involved in the fracture. Considering the intrinsic characteristics of the nanofibrillated cellulose, this vegetable fiber showed to be a promising material for use as nanoreinforcement of the cement-based composites, however, more studies are necessary about the optimum amount of nanofibers for improving the toughness of the cementitious composites. (AU)

• Processo FAPESP: 15/21079-0 - Obtenção de celulose nanofibrilada de bambu e seu potencial como reforço para matrizes frágeis
• Beneficiário: Viviane da Costa Correia
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 12/51467-3 - Agroindustrial wastes and their potential use as appropriate materials for housing and infraestructure (Agrowaste)
• Beneficiário: Holmer Savastano Junior
• Modalidade de apoio: Auxílio à Pesquisa - Temático