Effects of calcining conditions on the microstructure of sugar cane waste ashes (SCWA): Influence in the pozzolanic activation |
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| Authors: | E.V. Morales E. Villar-Cociña M. Frías S.F. Santos H. Savastano |
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| Affiliation: | 1. Department of Physics, Central University of Las Villas, Santa Clara, Villaclara 54830, Cuba;2. Eduardo Torroja Institute (CSIC), cl Serrano Galvache 4, 28033, Spain;3. Faculty of Animal Science and Food Engineering, University of Sao Paulo, Rural Construction, P.O. Box 23, Pirassununga SP 13635-900, Brazil;1. Civil & Environmental Engineering Department, Room 415, Jaesung Civil Engineering Building, 222 Wangsimni-ro, Seongdong Gu, Seoul, South Korea;2. Civil & Environmental Engineering Department, Room 404, Jaesung Civil Engineering Building, 222 Wangsimni-ro, Seongdong Gu, Seoul, South Korea;1. Department of Civil Engineering, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran;2. Young Researchers and Elite Club, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran;1. Zachry Department of Civil Engineering, Texas A&M University, College Station, TX 77840, USA;2. Department of Civil Engineering, Amirkabir University of Technology, Tehran, Iran;1. Maestría en Ciencias en Conservación y Aprovechamiento de Recursos Naturales, CIIDIR-Oaxaca, Calle Hornos No 1003, Col. Noche Buena, Sta. Cruz Xoxocotlán C.P. 71230, Oaxaca, Mexico;2. Instituto Politécnico Nacional, CIIDIR Oaxaca, Grupo de Materiales y Construcción, Mexico;3. Universidad Autónoma de Nuevo León (UANL), FIC, Cd Universitaria S/N, San Nicolás de los Garza, Nuevo León C.P. 66451, Mexico;4. Universidad Autónoma Benito Juárez de Oaxaca (UABJO), Cuerpo Académico de Materiales, Mexico;5. Instituto Politécnico Nacional, ESIME-Zacatenco, Cd. de México, Mexico;1. Department of Civil Engineering, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, Bangkok 10140, Thailand;2. Department of Civil Engineering, Faculty of Engineering, Rajamangala University of Technology Srivijaya, Songkla 90000, Thailand |
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| Abstract: | In this paper a study of calcining conditions on the microstructural features of sugar cane waste ash (SCWA) is carried out. For this purpose, some microparticles (<90 μm) of sugar cane straw ash and sugar cane bagasse ash of samples calcined at 800 °C and 1000 are studied by combining the bright field and the dark field images with the electron diffraction patterns in the transmission electron microscopy (TEM). It is appreciated that the morphology and texture of these microparticles change when silicon or calcium are present. Furthermore, it is observed that iron oxide (magnetite Fe3O4) is located in the calcium-rich particles.The microstructural information is correlated with the results of a kinetic–diffusive model that allows the computing of the kinetic parameters of the pozzolanic reaction (mainly the reaction rate constant). The results show that the sugar cane wastes ash calcined at 800 and 1000 °C have properties indicative of high pozzolanic activity. The X-ray diffraction patterns, the TEM images and the pozzolanic activity tests show the influence of different factors on the activation of these ashes. |
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