Processing and dimensional changes of cement based composites reinforced with surface-treated cellulose fibres

Autor(es)

Tonoli, G. H. D. ^[1] ; Belgacem, M. N. ^[2] ; Siqueira, G. ^[2] ; Bras, J. ^[2] ; Savastano, Jr., H. ^[3] ; Rocco Lahr, F. A. ^[4]

Afiliação do(s) autor(es)

^[1] Univ Fed Lavras, Forestry Sci Dept, BR-37200000 Lavras, MG - Brazil

^[2] Grenoble INP Pagora, Lab Genie Proc Papetiers LGP2, UMR CNRS 5518, F-38402 St Martin Dheres - France

^[3] Univ Sao Paulo, Dept Food Engn, Fac Zootecnia & Engn Alimentos, BR-13635900 Pirassununga, SP - Brazil

^[4] Univ Sao Paulo, Dept Struct Engn, Escola Engn Sao Carlos, BR-13566590 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CEMENT & CONCRETE COMPOSITES; v. 37, p. 68-75, MAR 2013.
• Citações Web of Science: 32

Resumo

The objective of the present work is to evaluate the impact of the surface grafting of cellulose fibres on the processing, dimensional stability and mechanical performance of fibre-cement composites. The surface modification of the pulps was performed with methacryloxypropyltri-methoxysilane (MPTS), aminopropyltri-ethoxysilane (APTS) and n-octadecyl isocyanate, an aliphatic isocyanate (Al). X-ray photoelectron spectroscopy (XPS) showed that the chemical changes have indeed occurred at the surface, and contact angle measurements showed that the surface energy has also changed. MPTS- and AI-treated fibres presented lower hydrophilic character than untreated fibres, whereas APTS increased the water retention value of the pulp. MPTS-treated fibres decreased the water retention and improved dimensional stability of the fibre-cement composites, while the contrary occurred with other modified fibres. Fibre-cement strength was little influenced by fibre treatment, whereas AI-treated fibres contributed to higher specific energy (SE) and the lower SE value for APTS-treated fibres is an indication of the improvement on fibre to cement adherence. These results are promising and contribute toward new strategies to improve the processing and stability of natural fibre-reinforced cement products. (C) 2013 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 05/59072-4 - Utilização de fibras curtas de eucalipto em fibrocimento sem amianto
• Beneficiário: Gustavo Henrique Denzin Tonoli
• Modalidade de apoio: Bolsas no Brasil - Doutorado