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Cellulose modified fibres in cement based composites
Authors:G.H.D. Tonoli  U.P. Rodrigues Filho  H. Savastano  J. Bras  M.N. Belgacem  F.A. Rocco Lahr
Affiliation:1. Department of Structural Engineering, Escola de Engenharia de São Carlos, Universidade de São Paulo, Avenida Trabalhador São Carlense, 400, São Carlos/SP 13566-590, Brazil;2. Department of Molecular Physics and Chemistry, Instituto de Química de São Carlos, Universidade de São Paulo, Avenida Trabalhador São Carlense, 400, São Carlos/SP 13566-590, Brazil;3. Department of Food Engineering, Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo (USP), Avenida Duque de Caxias Norte, 225, 13635-900 Pirassununga, São Paulo/SP, Brazil;4. Laboratoire de Génie des Procédés Papetiers (LGP2), UMR CNRS 5518, Grenoble INP-Pagora – 461, Rue de la Papeterie, 38402 Saint-Martin-d’Hères, France;1. Departament d’Enginyeria Tèxtil i Paperera, Universitat Politècnica de Catalunya – Barcelona TECH, C/Colom, 11, E-08222 Terrassa, Spain;2. Departament d’Enginyeria Agroalimentària i Biotecnologia, Universitat Politècnica de Catalunya – Barcelona TECH, Avinguda del Canal Olímpic, 15, E-08860 Castelldefels, Spain;3. Department of Civil Engineering, Federal University of Rio de Janeiro (COPPE/UFRJ), P.O. Box 68506, 21945-970 Rio de Janeiro, Brazil;1. Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, PR China;2. State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southwest University of Science and Technology, Mianyang 621010, PR China;3. Department of Mechanical Engineering, University of New Orleans, LA 70148, USA;1. Polymer and Composite Materials Group, Institute of Engineering in Technology and Science (INTECIN), Engineering Faculty, University of Buenos Aires, National Research Council (CONICET), Las Heras 2214 (C1127AAR), Buenos Aires, Argentina;2. École Normale Supérieure de Cachan, Département Génie Civil Francia, France;1. Department of Engineering, Universidade Federal de Lavras, Brazil;2. Department of Forest Sciences, Universidade Federal de Lavras, Brazil;3. Research Nucleus on Materials for Biosystems, University of São Paulo (Universidade de São Paulo)/USP, Brazil;1. Civil Engineering Department, COPPE, Universidade Federal do Rio de Janeiro, P.O. Box 68506, 21941-972 Rio de Janeiro, RJ, Brazil;2. Department of Civil Engineering, Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rua Marques de São Vicente 225, 22453-900 Rio de Janeiro, RJ, Brazil;3. Technology Department, Universidade Estadual de Feira de Santana, Av. Transnordestina, S/N, Novo Horizonte, 44.036-900 Feira de Santana, BA, Brazil;1. Department of Civil and Environmental Engineering, University of Windsor, Windsor, Ontario, Canada;2. Research and Development, Domtar Inc., Montreal, Quebec, Canada
Abstract:The objective of the present work is to evaluate the effect of surface modification of cellulose pulp fibres on the mechanical and microstructure of fibre–cement composites. Surface modification of the cellulose pulps was performed with Methacryloxypropyltri-methoxysilane (MPTS) and Aminopropyltri-ethoxysilane (APTS) in an attempt to improve their durability into fibre–cement composites. The surface modification showed significant influence on the microstructure of the composites on the fibre–matrix interface and in the mineralization of the fibre lumen as seen by scanning electron microscopy (SEM) with back-scattered electron (BSE) detector. Accelerated ageing cycles decreased modulus of rupture (MOR) and toughness (TE) of the composites. Composites reinforced with MPTS-modified fibres presented fibres free from cement hydration products, while APTS-modified fibres presented accelerated mineralization. Higher mineralization of the fibres led to higher embrittlement of the composite after accelerated ageing cycles. These observations are therefore very useful for understanding the mechanisms of degradation of fibre–cement composites.
Keywords:
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