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metadata.artigo.dc.title: Surface properties of eucalyptus pulp fibres as reinforcement of cement based composites
metadata.artigo.dc.creator: Tonoli, Gustavo Henrique Denzin
Almeida, Alessandra Etuko Feuzicana de Souza
Silva, Marcelo de Assumpção Pereira da
Bassa, Alexandre
Oyakawa, Danilo
Savastano Júnior, Holmer
metadata.artigo.dc.subject: Atomic force microscopy
Cellulose fibre
Contact angle
Surface energy 2010
metadata.artigo.dc.identifier.citation: TONOLI, G. H. D. et al. Surface properties of eucalyptus pulp fibres as reinforcement of cement based composites. Holzforschung, Berlin, v. 64, n. 5, 2010.
metadata.artigo.dc.description.abstract: The objective of the present work is to evaluate the effects of the surface properties of unrefined eucalyptus pulp fibres concerning their performance in cement-based composites. The influence of the fibre surface on the microstructure of fibre-cement composites was evaluated after accelerated ageing cycles, which simulate natural weathering. The surface of unbleached pulp is a thin layer that is rich in cellulose, lignin, hemicelluloses, and extractives. Such a layer acts as a physical and chemical barrier to the penetration of low molecular components of cement. The unbleached fibres are less hydrophilic than the bleached ones. Bleaching removes the amorphous lignin and extractives from the surface and renders it more permeable to liquids. Atomic force microscopy (AFM) helps in understanding the fibre-cement interface. Bleaching improved the fibre-cement interfacial bonding, whereas fibres in the unbleached pulp were less susceptible to the re-precipitation of cement hydration products into the fibre cavities (lumens). Therefore, unbleached fibres can improve the long-term performance of the fibre-cement composite owing to their delayed mineralization.
metadata.artigo.dc.language: en_US
Appears in Collections:DCF - Artigos publicados em periódicos

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