Abstract
This paper presents the results of the evaluation of the sugarcane leaf, burnt under controlled conditions in order to obtain a reactive ash with pozzolanic properties. Chemical analysis, amorphousity and surface structure of the sugar cane straw ash (SCSA) were studied by X-ray diffraction, X-ray fluorescence spectroscopy and scanning electron microscope (SEM). The results of this research showed that SCSA has significant presence of amorphous material and a high content of silica (81.0%). The pozzolanic activity of the SCSA was evaluated by the Fratini test and the pozzolanic activity index. In order to interpretate the pozzolan activity, the Feret method was used. It is conclude that the SCSA presents pozzolanic characteristics for blending Portland cement.
Highlights
The River Cauca Valley, with over 200000 hectares of sugar cane fields, potentially generates upward of five million tonnes of sugar cane straw
A partir del análisis de la ceniza se ha encontrado que el mayor porcentaje de sus partículas está compuesto por sílice con contenidos del orden de 93% y 73% para la cascarilla de arroz y el bagazo, respectivamente
Chemical method.- Seven- and 28-day pozzolanicity values were determined with the Frattini test described in Colombian standard NTC 1512 (19)
Summary
The River Cauca Valley, with over 200000 hectares of sugar cane fields, potentially generates upward of five million tonnes of sugar cane straw. En Colombia, diversas instituciones, entre las cuales se encuentran la Universidad del Valle con el Grupo de Investigación de Materiales Compuestos y la Universidad del Cauca con el Grupo CYTEMAC, han desarrollado estudios sobre la composición química y posibles usos de las cenizas de la cascarilla de arroz y el bagazo, ya que éstas se presentan en contenidos bastante elevados, con porcentajes de 22,15 y 14,71%, respectivamente. En cuanto a la ceniza de la hoja de caña de azúcar (Sugar Cane Straw Ash, SCSA), tanto obtenida a partir de hojas calcinadas a cielo abierto en las vecindades de una fábrica de azúcar (5-7) como en hornos rudimentarios (5, 6, 10), similares a los incineradores construidos en Asia para producir ceniza de cascarilla de arroz, se obtiene una significativa presencia de material amorfo (vítreo) y alta actividad puzolánica. Algunos investigadores han desarrollado modelos matemáticos para describir el proceso, tanto en el régimen cinético como en el cinético-difusivo, permitiendo determinar los parámetros que caracterizan el proceso y la cinética de la reacción puzolánica (11-14)
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