A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The use of extrusion technology for the production of cement boards with unbleached kraft pulps is evaluated in this paper. Cement boards reinforced by both hardwood and softwood pulp of different percentages were fabricated using an auger type lab extruder. The moisture content, water absorption and density of all batches were measured. The flexural response of the cement boards was used to investigate the strength, the toughness, the anisotropy, the age effect and the resistance to natural weathering as well as to freeze-thaw cycling. With a relative ease of manufacture and a much cleaner production, extrusion was found to be a suitable means for making cement boards with up to 8% pulp by weight. Higher pulp content increased the toughness of the material but didn't enhance the flexural strength appreciably due to a higher water content required for extrudability. Anisotropic behavior and age effect were observed. The extruded products exhibited good resistance to weathering and freeze-thaw cycling. Hardwood pulps, cheaper and more available than the softwood ones, were found to be more suitable for extrusion production in terms of extrudability, finished surface and long term mechanical properties.
The use of extrusion technology for the production of cement boards with unbleached kraft pulps is evaluated in this paper. Cement boards reinforced by both hardwood and softwood pulp of different percentages were fabricated using an auger type lab extruder. The moisture content, water absorption and density of all batches were measured. The flexural response of the cement boards was used to investigate the strength, the toughness, the anisotropy, the age effect and the resistance to natural weathering as well as to freeze-thaw cycling. With a relative ease of manufacture and a much cleaner production, extrusion was found to be a suitable means for making cement boards with up to 8% pulp by weight. Higher pulp content increased the toughness of the material but didn't enhance the flexural strength appreciably due to a higher water content required for extrudability. Anisotropic behavior and age effect were observed. The extruded products exhibited good resistance to weathering and freeze-thaw cycling. Hardwood pulps, cheaper and more available than the softwood ones, were found to be more suitable for extrusion production in terms of extrudability, finished surface and long term mechanical properties.
Strength, toughness and durability of extruded cement boards with unbleached kraft pulp
2002
14 Seiten, 9 Bilder, 3 Tabellen, 5 Quellen
Conference paper
English
Strength, Toughness and Durability of Extruded Cement Boards with Unbleached Kraft Pulp
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