Abstract
The impact of grafted surface of cellulose fibers on the mechanical and physical properties of fiber-cement composites (FCC) has been investigated. The grafting was performed with n-octadecyl isocyanate [i.e., with an aliphatic isocyanate (AI)], with the intention to protect the cellulose fiber from alkali degradation in the cement matrix. The chemical changes, observed by contact angle measurements and X-ray photoelectron spectroscopy, showed a higher hydrophobic character of AI-treated fibers. The strength of FCC was tested during 28 days of curing treatment. The extracted AI-treated fibers contributed to higher specific energy and final specific deflection after accelerated aging cycles in comparison with the reference composites reinforced with untreated fibers. The higher values of limit of proportionality and modulus of elasticity for composites with AI-treated fibers are an evidence of the densification of the fiber-matrix transition zone. The modulus of rupture values were higher for composites with AI-treated and Soxhlet-extracted fibers after 200 soak and dry aging cycles. In comparison with the reference, AI-treated fibers decreased the water absorption and the apparent porosity of the FCC. The modification of fibers could be a new strategy to improve the performance and stability of cement products reinforced with natural fibers.
Financial support for this research project was provided by the Conselho Nacional de Desenvolvimento Científico e Tecnológico and Fundação de Amparo à Pesquisa do Estado de São Paulo (Fapesp n. 2009/10614-0) and Fundação de Amparo à Pesquisa do Estado de Minas Gerais (Fapemig) in Brazil. Cementitious raw materials and Eucalyptus pulp were kindly furnished by Infibra Ltda. and Fibria Cellulose S.A., respectively, in Brazil. Thanks also to Rede Brasileira de Compósitos e Nanocompósitos Lignocelulósicos (Brazil).
References
Ahmed, A., Adnot, A., Grandmaison, J.L., Kaliaguine, S., Doucet, J. (1987) ESCA analysis of cellulosic materials. Cellulose Chem. Technol. 21:483–492.Search in Google Scholar
Arsene, A., Bilba, K. (2008) Silane treatment of bagasse fiber for reinforcement of cementitious composites. Composites Part A 39:1488–1495.10.1016/j.compositesa.2008.05.013Search in Google Scholar
ASTM Standard. C948-81. Test method for dry and wet bulk density, water absorption, and apparent porosity of thin sections of glass-fiber reinforced concrete. West Conshohocken, PA, USA, 1981.Search in Google Scholar
ASTM Standard. C150-09. Standard specification for Portland cement. West Conshohocken, PA, USA, 2009.Search in Google Scholar
Bel-Hassen, R., Boufi, S., Salon, M.C.B., Abdelmouleh, M., Belgacem, M.N. (2008) Adsorption of silane onto cellulose fibers. The effect of pH on silane hydrolysis, condensation, and adsorption behaviour. J. Appl. Polym. Sci. 108:1958–1968.Search in Google Scholar
Belgacem, M.N., Gandini, A. (2005) The surface modification of cellulose fibres for use as reinforcing elements in composite materials. Compos. Interf. 12:41–75.Search in Google Scholar
Belgacem, M.N., Gandini, A. Monomers, Polymers and Composites from Renewable Resources. Elsevier, Amsterdam, 2008a.Search in Google Scholar
Belgacem, M.N., Gandini, A. (2008b) Surface modification of cellulose fibres. In: Monomers, Polymers and Composites from Renewable Resources. Eds. Belgacem, M.N., Gandini, A. Elsevier, Amsterdam. Chapter 18. pp. 385–400.10.1016/B978-0-08-045316-3.00018-1Search in Google Scholar
Belgacem, M.N., Gandini, A. (2009) Natural fibre-surface modification and characterisation. In: Cellulose fibre reinforced polymer composites. Eds. Sabu, T., Pothan, L. Old City Publishing, Philadelphia, London and Paris. Chapter 2. pp. 14–46.Search in Google Scholar
Belgacem, M.N., Czeremuszkin, G., Sapieha, S., Gandini, A. (1995) Surface characterization of cellulose fibres by XPS and inverse gas chromatography. Cellulose 2:145–157.10.1007/BF00813015Search in Google Scholar
Boras, L., Gatenholm, P. (1999) Surface properties of mechanical pulps prepared under various sulfonation conditions and preheating time. Holzforschung 53:429–434.10.1515/HF.1999.071Search in Google Scholar
Brandt, A.M. (2008) Fibre reinforced cement-based (FRC) composites after over 40 years of development in building and civil engineering. Compos. Struct. 86:3–9.Search in Google Scholar
Bensted, J. (1999) Thaumasite—background and nature in deterioration of cements, mortars and concretes. Cem. Concr. Compos. 21:117–121.Search in Google Scholar
Dias, C.M.R., Savastano Jr., H., John, V.M. (2010) Exploring the potential of functionally graded materials concept for the development of fiber cement. Constr. Build. Mater. 24: 140–146.Search in Google Scholar
Dorris, G.M., Gray, D. (1978) The surface analysis of paper and wood fibres by ESCA. I. Application of cellulose and lignin. Cellulose Chem. Technol. 12:9–23.Search in Google Scholar
European Standard, EN 494 (1994) Fibre-cement profiled sheets and fittings for roofing—products specification and test methods.Search in Google Scholar
Fan, M.Z., Bonfield, P.W., Dinwoodie, J.M., Boxall, J., Breese, M.C. (2004) Dimensional instability of cement-bonded particleboard: the effect of surface coating. Cem. Concr. Res. 34:1189–1197.10.1016/j.cemconres.2003.12.010Search in Google Scholar
Freire, C.S.R., Silvestre, A.J.D., Pascoal Neto, C., Belgacem, M.N., Gandini, A. (2006) Controlled heterogeneous modification of cellulose fibers with fatty acids: effect of reaction conditions on the extent of esterification and fiber properties. J. Appl. Polym. Sci. 100:1093–1102.Search in Google Scholar
Gaiolas, C., Costa, A.P., Nunes, M., Silva, M.J.S., Belgacem, M.N. (2008) Grafting of paper by silane coupling agents using cold-plasma discharges. Plasma Process Polym. 5:444–452.10.1002/ppap.200700149Search in Google Scholar
Govin, A., Peschard, A., Fredon, E., Guyonnet, R. (2005) New insights into wood and cement interaction. Holzforschung 59:330–335.10.1515/HF.2005.054Search in Google Scholar
Hoikkanema, M., Honkanenb, M., Vippolab, M., Lepistob, T., Vuorinena, J. (2011) Effect of silane treatment parameters on the silane layer formation and bonding to thermoplastic urethane. Progr. Org. Coating 72:716–723.Search in Google Scholar
Ikai, S., Reichert, J.R., Rodrigues, A.V., Zampieri, V.A. (2010) Asbestos-free technology with new high toughness polypropylene (PP) fibers in air-cured Hatschek process. Constr. Build. Mater. 24:171–180.Search in Google Scholar
John, V.M., Agopyan, V., Prado, T.A. (1998) Durability of cement composites and vegetable fibres for roofing. In: Proceedings of 3rd Ibero-American Symposium on Roofing for Housing. Cyted/USP, São Paulo. pp. 51–59.Search in Google Scholar
Karade, S.R., Irle, M., Maher, K. (2005) Assessment of wood-cement compatibility: a new approach. Holzforschung 57:672–680.10.1515/HF.2003.101Search in Google Scholar
Krouit, M., Belgacem, M.N., Bras, J. (2010) Chemical versus solvent extraction treatment: comparison and influence on polyester based bio-composite mechanical properties. Composites Part A 41:703–708.10.1016/j.compositesa.2010.01.014Search in Google Scholar
Kulpinski, P., Erdman, A., Namyslak, M., Fidelus, J.D. (2012) Cellulose fibers modified by Eu3+-doped yttria-stabilized zirconia nanoparticles. Cellulose 19:1259–1269.10.1007/s10570-012-9704-6Search in Google Scholar
Mansur, A.A.P., Mansur, H.S. (2011) Surface interactions of chemically active ceramic tiles with polymer-modified mortars. Cem. Concr. Compos. 33:742–748.Search in Google Scholar
Neville, A.M. Properties of Concrete. 4th ed. John Wiley and Sons, New York, 1996.Search in Google Scholar
Owens, D.K., Wendt, R.C. (1969) Estimation of the surface free energy of polymers. J. Appl. Polym. Sci. 13:1741–1747.Search in Google Scholar
Paquet, O., Krouit, M., Bras, J., Thielemans, W., Belgacem, M.N. (2010) Surface modification of cellulose by PCL grafts. Acta Mater. 58:792–801.10.1016/j.actamat.2009.09.057Search in Google Scholar
Peijs, T., Baillie, C. (2003) Eco-composites (A special issue of 14 publications devoted to cellulose-based composite materials). Compos. Sci. Technol. 63:1223–1336.Search in Google Scholar
Plueddemann, E.P. Silane Coupling Agents, 2nd ed. Plenum Press, New York, 1991. pp. 272.10.1007/978-1-4899-2070-6Search in Google Scholar
Raquez, J.M., Murena, Y., Goffin, A.L., Habibi, Y., Ruelle, B., Debuyl, F., Dubois Aibi, P. (2012) Surface-modification of cellulose nanowhiskers and their use as nanoreinforcers into polylactide: a sustainably-integrated approach. Compos. Sci. Technol. 72:544–549.10.1016/j.compscitech.2011.11.017Search in Google Scholar
RILEM (1984). Testing methods for fibre reinforced cement-based composites. [Réunion internationale des aboratoires d’essais et des recherches sur lês matériaux et les constructions (RILEM).] Matér. Constr. 17:441–56.Search in Google Scholar
Rueda, L, Fernández d’Arlas, B., Zhou, Q., Berglund, L.A., Corcuera, M.A., Mondragon, I., Eceiza, A. (2011) Isocyanate-rich cellulose nanocrystals and their selective insertion in elastomeric polyurethane. Compos. Sci. Technol. 71:1953–1960.Search in Google Scholar
Savastano Jr., H., Warden, P.G. (2005) Special theme issue: natural fibre reinforced cement composites. Cem. Concr. Compos. 27:517–624.Search in Google Scholar
Savastano Jr., H., Warden, P.G., Coutts, R.S.P. (2000) Brazilian waste fibres as reinforcement for cement-based composites. Cem. Concr. Compos. 22:379–384.Search in Google Scholar
Savastano Jr., H., Turner, A., Mercer, C., Soboyejo, W.O. (2006) Mechanical behavior of cement-based materials reinforced with sisal fibers. J. Mater. Sci. 41:6938–6948.Search in Google Scholar
Savastano Jr., H., John, V.M., Agopyan, V., Moslemi, A. (2010) Special issue on inorganic-bonded fiber composites. Constr. Build. Mater. 24:129–220.Search in Google Scholar
Stenstad, P., Andresen, M., Tanem, B.S., Stenius, P. (2008) Chemical surface modifications of microfibrillated cellulose. Cellulose 15:35–45.10.1007/s10570-007-9143-ySearch in Google Scholar
Siqueira, G., Bras, J., Dufresne, A. (2010) New process of chemical grafting of cellulose nanoparticles with a long chain isocyanate. Langmuir 26:402–411.10.1021/la9028595Search in Google Scholar
Tappi Useful Method UM-256. Water retention value. Technical association of the pulp and paper industry. Atlanta, GA, USA, 1981.Search in Google Scholar
Tonoli, G.H.D., Joaquim, A.P., Arsène, M.A., Bilba, K., Savastano Jr., H. (2007) Performance and durability of cement based composites reinforced with refined sisal pulp. Mater. Manuf. Processes 22:1–8.Search in Google Scholar
Tonoli, G.H.D., Rodrigues Filho, U.P., Savastano Jr., H., Bras, J., Belgacem, M.N., Lahr, F.A.R. (2009) Cellulose modified fibres in cement based composites. Composites Part A 40:2046–2053.10.1016/j.compositesa.2009.09.016Search in Google Scholar
Tonoli, G.H.D., Almeida, A.E.F.S., Pereira, M.A.S., Bassa, A., Oyakawa, D., Savastano Jr., H. (2010) Surface properties of Eucalyptus pulp fibres as reinforcement of cement-based composites. Holzforschung 64:595–601.Search in Google Scholar
Tonoli, G.H.D., Santos, S.F., Savastano Jr., H., Delvasto, S., Mejía de Gutiérrez, R., Lopez de Murphy, M. del M. (2011a) Effects of natural weathering on microstructure and mineral composition of cementitious roofing tiles reinforced with fique fibre. Cem. Concr. Compos. 33:225–232.10.1016/j.cemconcomp.2010.10.013Search in Google Scholar
Tonoli, G.H.D., Savastano Jr., H., Santos, S.F., Dias, C.M.R., John, V.M., Lahr, F.A.R. (2011b) Hybrid reinforcement of sisal and polypropylene fibers in cement-based composites. J. Mater. Civ. Eng. 23:177–187.10.1061/(ASCE)MT.1943-5533.0000152Search in Google Scholar
Tonoli, G.H.D., Belgacem, M.N., Bras, J., Silva, M.A.P., Lahr, F.A.R, Savastano Jr., H. (2012) Impact of bleaching pine fibre on the fibre/cement interface. J. Mater. Sci. 47:4167–4177.Search in Google Scholar
Tonoli, G.H.D., Belgacem, M.N., Siqueira, G., Bras, J., Savastano Jr., H., Lahr, F.A.R. (2013) Processing and dimensional changes of cement based composites reinforced with surface-treated cellulose fibres. Cem. Concr. Compos. 37:68–75.Search in Google Scholar
Won, J.P., Hong, B.T., Choi, T.J., Lee, S.J., Kang, J.W. (2012) Flexural behaviour of amorphous micro-steel fibre-reinforced cement composites. Compos. Struct. 94:1443–1449.Search in Google Scholar
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