Abstract
Dry-processed wastepaper (magazine) fibers possess desirable mechanical characteristics as reinforcing fibers in cement-based matrices; up to 50% of virgin wood fibers have been replaced with wastepaper fibers in cement composites without any significant change in short-term performance characteristics. The large volumes of fibrous cement board used in building construction promise to provide wastepaper with a large-volume and high-value application. In this study, the effects of weathering on the performance of recycled wastepaper fiber-cement composites were investigated through accelerated aging tests simulating natural aging conditions. Microstructural studies were conducted in order to establish the mechanisms of aging in the composite material. These mechanisms provided the basis for the selection of certain refinements in the matrix composition, which were successfully evaluated for the control of weathering effects on the composite material structure and properties. The effects of aging and moisture on composites were best controlled by measures which reduced the calcium hydroxide content of hydration products and improved the watertightness and the structure of interface zones; these refinements were made using relatively high levels of cement replacement with silica fume or through full substitution of Portland cement with a special cement.
Résumé
Les fibres de papier journal recyclées à sec présentent des propriétés mécaniques permettant de les utiliser comme fibres de renforcement dans des matrices cimentaires; on a remplacé jusqu'à 50% de fibres de bois viege par des fibres de papier de récupération dans des composites cimentaires sans qu'il se produise de changement significatif dans les performances à court terme. Les vastes quantités de panneaux de ciment fibreux utilisées dans la construction promettent de fournir en quantité importante, du papier de rebut pour des applications de qualité. On a étudié ici les effets du vieillissement sur la performance de composites ciment/fibres de papier de récupération recyclé par des essais accélérés simulant les conditions naturelles du vieillissement. On s'est livré à des études microstructurales afin de déterminer les mécanismes de vieillissement du composite; grâce à quoi on a pu opérer certaines améliorations de la matrice dont l'évaluation a permis de contrôler les effets du vieillissement sur la structure et les propriétés du matériau composite. L'influence du vieillissement et de l'humidité sur les composites a été la mieux contrôlée par des mesures réduisant la teneur en hydroxyde de calcium des produits d'hydratation et améliorant l'étanchéité et la structure des zones d'interface; ces améliorations ont été pratiquées en utilisant des taux assez élevés de fumées de silice en remplacement du ciment ou en substituant entièrement un ciment spécial au ciment Portland.
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References
ASTM C1186-91 (1991), ‘Standard Specification for Flat Non-Asbestos Fiber-Cement Sheets’.
Earnst, Charles M (1987), ‘The Modern Thermogravimetric Approach to the Compositional Analysis of Materials’, ASTM STP 997, Compositional Analysis by Thermogravimetry, pp. 1–18.
Vinson, K. D. and Daniel, J. I., ‘Specialty cellulose fibers for cement reinforcement’, Thin section fiber reinforced concrete and ferrocement, American Concrete Institute Publication SP-124, 1990, pp. 99–124.
Coutts, R. S. P., ‘Sticks and stones’,Forest Products Newsletter. CSIRO Division of Chemical and Wood Technology (Australia), Vol. 2, No. 1, 1988, pp. 1–4.
Coutts, R.S.P., ‘Autoclaved beaten wood fiber reinforced cement composites’,Composites,15 (2) (1984) 139–143.
Coutts, R.S.P. and Mitchell, A.S., ‘Wood pulp fiber-cement composites’,Journal of Applied Polymer Science: Applied Polymer Symposium,37 (1983) 29–844 John Wiley & Sons Inc.
Coutts, R.S.P., ‘Wood fibers in organic matrices’,Chemistry in Australia,50 (5) (1983) 143–148.
Soroushian, P. and Shah, Z., ‘Reinforcement of thin cement products with recycled wastepapers fibers’, Report MSU-Engr-002-93, College of Engineering, Michigan State University, (1993).
Soroushian, P. and Marikunte, S., ‘Reinforcement of cementbased material with cellulose fibers’, Thin section fiber reinforced concrete and ferrocement, American Concrete Institute, Publication SP-124 (1990) 99–124.
Sharman, W.R. and Vautier, B.P., ‘Accelerated durability testing of autoclaved wood-fiber reinforced cement-sheet composites’,Durability of Building Materials 3 (1986) 255–275.
Sharman, W.R., ‘Durability of fiber-concrete sheet claddings’, New Zealand Concrete Construction, (Aug. 1983), 3–7.
Bentur, A., ‘Silica fume treatments as means for improving durability of glass fiber reinforced cements’,Journal of Materials in Civil Engineering, ASCE,1 3 (Aug. 1989) 167–183.
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Soroushian, P., Shah, Z. & Won, J.P. Aging effects on the structure and properties of recycled wastepaper fiber cement composites. Mat. Struct. 29, 312–317 (1996). https://doi.org/10.1007/BF02486366
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DOI: https://doi.org/10.1007/BF02486366