CEMENTOS DE ACTIVACIÓN ALCALINA PRODUCIDOS EMPLEANDO COMO PRECURSOR CENIZAS DE BIOMASA
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2024-09-19
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Jaén: Universidad de Jaén
Resumen
En esta investigación, se analizaron las características físicas y mecánicas de geopolímeros basados en
cenizas de biomasa activados con una solución de silicato sódico e hidróxido sódico. Se investigó la
influencia del módulo de activador (Ms = mol SiO2/ mol Na2O) de la solución activante, con valores de 0,
5, 1,0, 1,5 y 2,0, en las propiedades tecnológicas del material cementante. Los resultados revelaron que
un módulo de activador Ms= 1,5 da lugar a cementos con las propiedades mecánicas óptimas,
alcanzandosé resistencias a compresión de 26 MPa y resistencias a flexión de 7,8 MPa tras 28 días de
curado. Por tanto, los resultados indican que las cenizas de biomasa activadas con un Ms=1,5 son un
precursor efectivo para fabricar geopolímeros destinados a usos estructurales.
This investigation analysed the physical and mechanical characteristics of biomass ash-based geopolymers activated with a sodium silicate and sodium hydroxide solution. The influence of the activator modulus (Ms = mol SiO2/ mol Na2O) of the activating solution, with values of 0, 5, 1.0, 1.5 and 2.0, on the technological properties of the cementitious material was investigated. The results revealed that an activator modulus Ms= 1.5 results in cements with optimum mechanical properties, reaching compressive strengths of 26 MPa and flexural strengths of 7.8 MPa after 28 days of curing. Therefore, the results indicate that biomass ashes activated with Ms=1.5 are an effective precursor for the manufacture of geopolymers for structural applications. The production of this type of cement is not only economical due to the low cost of the raw materials used but also energy efficient, as synthesis occurs at temperatures close to ambient temperature, significantly contributing to the approach towards a circular economy.
This investigation analysed the physical and mechanical characteristics of biomass ash-based geopolymers activated with a sodium silicate and sodium hydroxide solution. The influence of the activator modulus (Ms = mol SiO2/ mol Na2O) of the activating solution, with values of 0, 5, 1.0, 1.5 and 2.0, on the technological properties of the cementitious material was investigated. The results revealed that an activator modulus Ms= 1.5 results in cements with optimum mechanical properties, reaching compressive strengths of 26 MPa and flexural strengths of 7.8 MPa after 28 days of curing. Therefore, the results indicate that biomass ashes activated with Ms=1.5 are an effective precursor for the manufacture of geopolymers for structural applications. The production of this type of cement is not only economical due to the low cost of the raw materials used but also energy efficient, as synthesis occurs at temperatures close to ambient temperature, significantly contributing to the approach towards a circular economy.