Characterization of Sugarcane Bagasse Ash for Use in the Production of Geopolymers

Reference Presenter Authors
04-097 Mérilin Cristina dos Santos Fernandes Fernandes, M.C.(Universidade Estadual Paulista "Júlio de Mesquita Filho"); Luna, C.M.(Universidade Estadual Paulista "Júlio de Mesquita Filho"); There is interest in replacing traditional cement with alternative cementitious materials that show the desired specifications with less environmental damage. In this sense, geopolymers emerged as a new class of newly developed materials with cementitious characteristics [1]. Theoretically, all aluminosilicate material can be activated by alkalis for the geopolymers production, provided some requirements are met: high solubility in basic medium and high availability of SiO2 and Al2O3 in the medium [2]. Due to the high silica concentration and pozzolanic behavior of the sugarcane bagasse ash, it been studied as a potential cement additive. This ash is a waste generated as a result of the sugarcane bagasse burning in boilers to produce steam and electric power and has no suitable destination. Sugarcane is one of the most produced crops in the world with an estimated production in Brazil of 635 million tons in the 2017/2018 harvest [3]. Thus, the main purpose of this work was to investigate the possibility to use sugarcane bagasse ash as raw material in geopolymers by analyzing its physical and chemical characteristics in x-ray fluorescence, x-ray diffraction and thermogravimetric analysis. Such an application can be an economical alternative in the geopolymers production, besides being a suitable destination for a waste produced in large quantity. The results obtained in this work show that sugarcane bagasse ash is a promising material in the production of geopolymers with the possibility of mixing with other aluminosilicates, such as metakaolin. The amount of ash to be incorporated in the metakaolin will depend on the characteristics of this last material.
[1] DUXSON, P. et al. Journal of Materials Science, 42 (9), p. 2917-2933, 2007.
[2] SHI, C. et al. Cement and Concrete Research, 41 (7), p. 750-763, 2011.
[3] CONAB. Acompanhamento da Safra Brasileira Cana-de-Açúcar, 4 (3), p. 8, 2017.
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