The feasibility of using woody biomass fly ash (WBFA) as a mineral admixture in cement-based materials was investigated. This fly ash was characterized for chemical composition and used to prepare a cement blend with 70 wt% Portland cement and 30 wt% WBFA. Cubic specimens were cast from a blended cement paste (water-to-binder ratio 0.50) and, after 28 days of curing at 20°C and 100% relative humidity, these specimens were tested for heavy metal leachability through the use of a sequential leaching protocol, at a constant pH of leachant (deionized water; pH 6.0). It was found that, except for the chloride content, the WBFA is able to meet the European chemical requirements established for reuse of coal fly ash in cement-based materials. Although the WBFA is characterized by a significant content of heavy metals of particular environmental concern (Cd, Cr, Cu, Ni, Pb, Zn), the results of the monolith leaching test have shown a good immobilization capacity of such metals by the cementitious matrix and, consequently, a good environmental quality of the blended cement investigated.

Reuse of woody biomass fly ash in cement-based materials: leaching tests / Berra, Mario; De Casa, Giancarlo; Dell'Orso, Marcello; Galeotti, Luigi; Mangialardi, Teresa; Paolini, Antonio Evangelista; Piga, Luigi. - STAMPA. - VIII(2011), pp. 133-146. ((Intervento presentato al convegno International Scientific Meeting on “Recycling of Biomass Ashes” tenutosi a Innsbruck nel 22-23 marzo 2010. [10.1007/978-3-642-19354-5_10].

Reuse of woody biomass fly ash in cement-based materials: leaching tests

De Casa, Giancarlo;Galeotti, Luigi;Mangialardi, Teresa;Paolini, Antonio Evangelista;Piga, Luigi
2011

Abstract

The feasibility of using woody biomass fly ash (WBFA) as a mineral admixture in cement-based materials was investigated. This fly ash was characterized for chemical composition and used to prepare a cement blend with 70 wt% Portland cement and 30 wt% WBFA. Cubic specimens were cast from a blended cement paste (water-to-binder ratio 0.50) and, after 28 days of curing at 20°C and 100% relative humidity, these specimens were tested for heavy metal leachability through the use of a sequential leaching protocol, at a constant pH of leachant (deionized water; pH 6.0). It was found that, except for the chloride content, the WBFA is able to meet the European chemical requirements established for reuse of coal fly ash in cement-based materials. Although the WBFA is characterized by a significant content of heavy metals of particular environmental concern (Cd, Cr, Cu, Ni, Pb, Zn), the results of the monolith leaching test have shown a good immobilization capacity of such metals by the cementitious matrix and, consequently, a good environmental quality of the blended cement investigated.
Recycling of Biomass Ashes
9783642193538
ash; reuse; biomass
02 Pubblicazione su volume::02a Capitolo o Articolo
Reuse of woody biomass fly ash in cement-based materials: leaching tests / Berra, Mario; De Casa, Giancarlo; Dell'Orso, Marcello; Galeotti, Luigi; Mangialardi, Teresa; Paolini, Antonio Evangelista; Piga, Luigi. - STAMPA. - VIII(2011), pp. 133-146. ((Intervento presentato al convegno International Scientific Meeting on “Recycling of Biomass Ashes” tenutosi a Innsbruck nel 22-23 marzo 2010. [10.1007/978-3-642-19354-5_10].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/387235
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