High temperature behavior of sodium and potassium volcanic ashes-based alkali-activated materials (Mt. Etna, Italy)

Scanferla, Paolo; Finocchiaro, Claudio; Gharzouni, Ameni; Barone, Germana; Mazzoleni, Paolo; Rossignol, Sylvie

doi:10.1016/j.conbuildmat.2023.133702

Cited by 5 publications

(2 citation statements)

References 41 publications

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“…Moreover, this material has proven effective in real-world restoration efforts, as exemplified by its successful application in the replication of AA-mortar for the restoration of a mosaic section within the Monreale Cathedral, a UNESCO Heritage site situated in Sicily, Italy [77]. Finally, these binders evidenced a wide versatility, considering the tests with foaming agents for the production of foamy paste [78] or the high fire resistance observed up to 1000 • C [79].…”

Section: Methodsmentioning

confidence: 99%

An Economic Analysis of the Use of Local Natural Waste: Volcanic Ash of Mt. Etna Volcano (Italy) for Geopolymer Production

Cavalieri,

Ferrara,

Finocchiaro

et al. 2024

Sustainability

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This paper analyses the net social benefits deriving from the medium-scale production of geopolymers based on volcanic ash compared to traditional cementitious materials used in construction and restoration sectors. In contrast to the existing literature grounded on the physical and mechanical characterization of geopolymers, our analysis considers two aspects: public finance savings from avoiding the disposal of volcanic ash in landfills and environmental benefits deriving from reduction in CO2 releases due to the production process at room temperature. Our case study focuses on the reuse of natural waste, namely the volcanic ash of the Mt. Etna volcano (Italy), whose disposal involves significant costs for society. Its use in the alkaline activation process avoids the exploitation of natural resources. Considering the huge amount of volcanic ash from Mt. Etna that falls on the urban areas of Eastern Sicily, the results show relevant economic benefits, in terms of both avoided costs and tax reductions for the citizens. Alongside these, significant environmental benefits are evidenced thanks to the release of up to 78% lower CO2 emissions by synthesised materials with volcanic ash than by traditional cementitious ones. Overall, the social cost savings compared to traditional materials is 0.339 EUR/kg for geopolymer.

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Section: Methodsmentioning

confidence: 99%

An Economic Analysis of the Use of Local Natural Waste: Volcanic Ash of Mt. Etna Volcano (Italy) for Geopolymer Production

Cavalieri,

Ferrara,

Finocchiaro

et al. 2024

Sustainability

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“…Considering previous studies [41,42] and to assure satisfying results, a small amount of MK was added in the last two sets in order to increase the low reactivities of fly ash and volcanic ash due to their low Al amounts compared to that of MK.…”

Section: Binder and Mortar Preparationsmentioning

confidence: 99%

Compositional Differences in Construction and Demolition Wastes (CDWs) for Geopolymer Mortars: A Comparative Study Using Different Precursors and Alkaline Reagents

Volpintesta,

Finocchiaro,

Barone

et al. 2024

Minerals

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In the view of the recycling and upscaling processes of waste materials, three different precursors, namely metakaolin, fly ash and volcanic ash, were mixed with Na- or K-silicate to produce binders aimed for the synthesis of geopolymer mortars based on construction and demolition wastes (CDWs). These later, used as aggregates in amount of 50 wt.%, were sampled in two geologically different Italian areas. A comparative study was carried out through a multidisciplinary approach using mineralogical–chemical analyses and physical–mechanical tests for the characterization of six binders and twelve mortars. The aim was to verify the effects of CDW interactions on binders as well as the extent of their compositional influences on the final properties. The chemical and mineralogical results evidenced strong compositional differences among the CDWs, differently influencing the physical–mechanical performances (i.e., compressive strength, density, water absorption and porosity) of the mortar samples. Regardless of the types of precursors and CDWs used, a better influence of K-silicate than sodium on the synthetised samples was observed. Furthermore, the higher versatility of metakaolin mortars with any type of CDW used was noted. Contrary, fly ash and volcanic ash mortars showed better properties with CDWs based on their high silica content and volcanic minerals. The study highlighted the critical roles of the CDW composition and precursor selection in mortar production. It confirmed that CDWs can be recycled for geopolymeric synthesis through proper characterisation and binder selection. Optimising these parameters allows for the successful integration of CDWs into geopolymeric materials. This process supports the advancement of a circular economy in the construction industry.

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Effects of the addition of slaked lime to alkali-activated pastes based on volcanic ashes from Mt. Etna volcano (Italy)

Finocchiaro,

Occhipinti,

Barone

et al. 2024

Ceramics International

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High temperature behavior of sodium and potassium volcanic ashes-based alkali-activated materials (Mt. Etna, Italy)

Cited by 5 publications

References 41 publications

An Economic Analysis of the Use of Local Natural Waste: Volcanic Ash of Mt. Etna Volcano (Italy) for Geopolymer Production

An Economic Analysis of the Use of Local Natural Waste: Volcanic Ash of Mt. Etna Volcano (Italy) for Geopolymer Production

Compositional Differences in Construction and Demolition Wastes (CDWs) for Geopolymer Mortars: A Comparative Study Using Different Precursors and Alkaline Reagents

Effects of the addition of slaked lime to alkali-activated pastes based on volcanic ashes from Mt. Etna volcano (Italy)

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