COMPATIBILITY OF FOUR EASTERN CANADIAN WOODS WITH GYPSUM AND GYPSUM-CEMENT BINDERS BY ISOTHERMAL CALORIMETRY
作者： Raúl Espinoza Herrera , Alain Cloutier
DOI: 10.4067/S0718-221X2008000300009
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摘要: La viabilidad de cuatro especies madera del este Canada para la elaboracion tableros particulas aglomeradas mezcladas con yeso y una mezcla yeso-cemento fue estudiada por calorimetria isotermica siguiendo las reacciones hidratacion mezclas yeso-madera yesocemento-madera. compatibilidad determinada sobre dos tipos madera, unas sometidas a un pre-tratamiento extraccion agua caliente otras sin pre-tratamiento. Se utilizaron siguientes especies: Pinus banksiana, Abies balsamea, Populus tremuloides Betula papyrifera. De acuerdo al factor compatibilidad, fueron consideradas compatibles el yeso-cemento, siendo aptas fabricacion compuestos. El contenido extractivos solubles en bajo no influyo determinacion compatibilidad. Sin embargo, los afectaron tiempos caso balsamea retrasaron nivel indeseable. Tanto adicion 30% cemento como redujeron visiblemente tiempo requerido alcanzar maximo flujo calor, ademas eliminar efecto causado yeso. En general, menos sensible efectos inhibitorios que puro. Abstract In order to determine the feasibility of manufacturing wood-gypsum and wood-gypsum-cement particleboards, hydration reactions four Eastern Canadian wood species with gypsum Portland cement were studied. The compatibility hot water extracted raw particles both gypsum-Portland mixture determined for jack pine, balsam fir, aspen white birch by isothermal calorimetry. found be compatible suitable inorganic-bonded composite boards on basis factor. extractive content was low in did not have consistent impact Nevertheless, soluble extractives an time required reach maximum heat flux, delaying it undesirable levels particularly case fir mixed neat gypsum. However, effect markedly reduced addition cement. Hot extraction significantly flux. gypsum-cement less sensitive inhibitory than
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