A porous geopolymer based on aluminum-waste with acoustic properties.

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ID: 3990
2019
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Ranked #71 of 145 articles by views in waste management (new york, ny)

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Abstract
Paval, a solid waste stream from the aluminum industry, is used as a pore generation agent in geopolymers. Paval was mixed with coal combustion fly ash, as a geopolymeric precursor, and activated with alkaline solution with the aim of obtaining porous geopolymers to be used as noise barriers. Both geopolymeric and pore generation reactions happen simultaneously. Aluminum from Paval can react with water and OH¯ from the geopolymerization activating solution, producing hydrogen. The hydrogen gas released generates a highly porous material. The influence of the fly ash-paval proportion and the setting temperature on open porosity, compressive strength and noise-absorbing properties were evaluated. To better understand these influences, the setting time, volume expansion and mineral composition were also studied. The obtained results showed that a higher Paval content (fly ash-Paval ratio 50:50) and setting temperature (70 °C) produced a lower setting time and higher volume expansion, increasing the open porosity and improving acoustic properties, but reducing the compressive strength. The material manufactured under these conditions showed similar amorphous phase content to the non-porous geopolymers made without Paval. On the other hand, the obtained materials did not raise environmental concerns in a normalised leaching test.
Reference Key
leiva2019awaste Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Leiva, C;Luna-Galiano, Y;Arenas, C;Alonso-Fariñas, B;Fernández-Pereira, C;
Journal waste management (new york, ny)
Year 2019
DOI
S0956-053X(19)30430-1
URL
Keywords Keywords not found

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