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    Characterization and evaluation of rice husk ash and wood ash in sustainable clay matrix bricks

    Autor: 
    Eliche-Quesada, D
    ;
    Felipe Sesé, Manuel Ángel (1)
    ;
    López-Pérez, J A
    ;
    Infantes-Molina, A
    Fecha: 
    01/2017
    Palabra clave: 
    rice husk ash; wood ash; clay bricks; sustainability; technological properties; JCR; Scopus
    Tipo de Ítem: 
    Articulo Revista Indexada
    URI: 
    https://reunir.unir.net/handle/123456789/5371
    DOI: 
    http://dx.doi.org/10.1016/j.ceramint.2016.09.181
    Dirección web: 
    http://www.sciencedirect.com/science/article/pii/S0272884216317163?via%3Dihub
    Resumen:
    This study analyzes the feasibility of using biomass combustion ash waste (rice husk or wood ash from boards) as secondary raw materials in the manufacture of clay bricks. The ash was characterized using particle size distribution analysis, chemical composition analysis by X-ray diffraction (XRD) and X-ray fluorescence (XRF), thermal analysis, elemental analysis, and scanning electron microscopy (SEM). Either rice husk ash or wood ash was used to replace different amounts (10-30 wt%) of clay in brick manufacture. Brick samples were formed by compression at 54.5 MPa and fired at temperatures of 900 or 1000 degrees C for 4 h, at a heating rate of 3 degrees C/min. The bricks' properties were compared to conventional products containing only clay and prepared following standard procedures. The bricks' technological properties depended on type and amount of ash used, and firing temperature. The results showed small variations due to firing temperature. Firing at 1000 degrees C achieved greater densification and thus lower water absorption and higher compressive strength firing at 900 degrees C produced higher porosity, which reduced compressive strength. Based on the results, 1000 degrees C was selected as the optimal firing temperature; and 10 wt% rice husk ash and 20 wt% wood ash as the optima amounts of biomass ash waste. Moreover, the bricks containing wood ash showed properties similar to the control bricks containing only clay and improved thermal conductivity. Finally, the bricks containing 10 wt% rice husk ash and 30 wt% wood ash fulfilled standard requirements for clay masonry units.
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