The issue of transforming asbestos-cement waste into a usable product

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26232511%3A_____%2F25%3AN0000074" target="_blank" >RIV/26232511:_____/25:N0000074 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

The issue of transforming asbestos-cement waste into a usable product

Popis výsledku v původním jazyce

Asbestos minerals, which belong to the silicate group, naturally occur in two main forms: chrysotile and amphibole. A key characteristic of all asbestos minerals is their fibrous structure, with lengths that greatly exceed their cross-sectional dimensions. Materials containing asbestos are defined as those with an asbestos content exceeding 0.1 wt.%. Classified as a carcinogenic and mutagenic hazardous substance, asbestos has been widely utilized due to its exceptional properties, including non-flammability, resistance to acids and alkalis, strength, and flexibility. Notably, asbestos-cement products represent a significant category, extensively employed in the construction industry. As a result, substantial quantities of asbestos remain in existing buildings, necessitating costly disposal in dedicated landfills. These landfills pose potential risks to future generations, underscoring the need for practical, safe disposal methods or, ideally, the reprocessing of asbestos into materials suitable for alternative applications. Current asbestos waste processing technologies are categorized into five approaches: thermal, thermochemical, chemical, physico-chemical, and mechano-chemical methods. The thermal method, applied on a limited and pilot scale in the Netherlands, is used to produce ceramics and artificial aggregates. The chemical method, also at a pilot stage, is employed primarily in France for generating silica and magnesium, though it requires the use of highly aggressive chemicals. The thermochemical method involves the addition of fluxes to lower the temperature required for transforming asbestos-containing waste into inert artificial aggregates, with applications in Australia and the USA. Mechano-chemical processing necessitates rigorous filtration of resulting dust or operation in a liquid medium; in the Netherlands and the USA, this approach yields calcium silicate hydrate, which can be used in cement, paints, and catalysts. Physico-chemical technology includes the MID-MIX method, which processes asbestos dust and sludge with the addition of quicklime to produce a filler for concrete or asphalt (used in Croatia and the Netherlands). Most of these technologies rely on specialized processes and equipment. In contrast, our proposed approach leverages existing technology to recycle asbestos-cement waste, yielding a functional hydraulic or carbonatable binder—an active and sustainable building material.

Název v anglickém jazyce

The issue of transforming asbestos-cement waste into a usable product

Popis výsledku anglicky

Asbestos minerals, which belong to the silicate group, naturally occur in two main forms: chrysotile and amphibole. A key characteristic of all asbestos minerals is their fibrous structure, with lengths that greatly exceed their cross-sectional dimensions. Materials containing asbestos are defined as those with an asbestos content exceeding 0.1 wt.%. Classified as a carcinogenic and mutagenic hazardous substance, asbestos has been widely utilized due to its exceptional properties, including non-flammability, resistance to acids and alkalis, strength, and flexibility. Notably, asbestos-cement products represent a significant category, extensively employed in the construction industry. As a result, substantial quantities of asbestos remain in existing buildings, necessitating costly disposal in dedicated landfills. These landfills pose potential risks to future generations, underscoring the need for practical, safe disposal methods or, ideally, the reprocessing of asbestos into materials suitable for alternative applications. Current asbestos waste processing technologies are categorized into five approaches: thermal, thermochemical, chemical, physico-chemical, and mechano-chemical methods. The thermal method, applied on a limited and pilot scale in the Netherlands, is used to produce ceramics and artificial aggregates. The chemical method, also at a pilot stage, is employed primarily in France for generating silica and magnesium, though it requires the use of highly aggressive chemicals. The thermochemical method involves the addition of fluxes to lower the temperature required for transforming asbestos-containing waste into inert artificial aggregates, with applications in Australia and the USA. Mechano-chemical processing necessitates rigorous filtration of resulting dust or operation in a liquid medium; in the Netherlands and the USA, this approach yields calcium silicate hydrate, which can be used in cement, paints, and catalysts. Physico-chemical technology includes the MID-MIX method, which processes asbestos dust and sludge with the addition of quicklime to produce a filler for concrete or asphalt (used in Croatia and the Netherlands). Most of these technologies rely on specialized processes and equipment. In contrast, our proposed approach leverages existing technology to recycle asbestos-cement waste, yielding a functional hydraulic or carbonatable binder—an active and sustainable building material.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20100 - Civil engineering

Projekt

<a href="/cs/project/SS07020041" target="_blank" >SS07020041: Využití nebezpečného odpadu pro výrobu hydraulického pojiva</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů