Cementitious binders for immobilization of hazardous elements

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Cementitious binders for immobilization of hazardous elements

Popis výsledku v původním jazyce

The paper deals with development of cementitious binders for immobilization of certain toxic elements or groups of elements (oxyanions-forming elements, heavy metals, amphoteric elements). The base of the binders for stabilization of cationic and certain anionic contaminants are clinkers with phosphorus incorporated into the structure of clinker silicates. Hydration of such binders results in formation of phases with the apatite structure, which is known to be able to immobilize hazardous elements, and belite and alite structures for formation of binding hydrosilicates, ensuring the physical compactness of the hydrated matter and also the fixation of some toxic elements. Further binders tested for immobilization properties were clinkers with other types of anionic substitutions in belite and alite (SO3) or other cement types (e.g., calciumaluminate - CAC), their mixtures with supplementary additives (sorbents, additives changing the Ca/Si ratio of C-S-H gel, or substance providing phosphorus for formation of insoluble compounds with apatite structure). The prepared binders were mixed with water doped with various toxic elements; after a defined period of cement stone hydration the specimens were subjected to long-term testing of leachability of individual toxic elements. The research methods involved besides leaching tests were also optical and electron microscopy. Proceedings of the 6th International Conference on Sustainable Solid Waste Management, Naxos, Greece, 13-16 June 2018, p 6

Název v anglickém jazyce

Cementitious binders for immobilization of hazardous elements

Popis výsledku anglicky

The paper deals with development of cementitious binders for immobilization of certain toxic elements or groups of elements (oxyanions-forming elements, heavy metals, amphoteric elements). The base of the binders for stabilization of cationic and certain anionic contaminants are clinkers with phosphorus incorporated into the structure of clinker silicates. Hydration of such binders results in formation of phases with the apatite structure, which is known to be able to immobilize hazardous elements, and belite and alite structures for formation of binding hydrosilicates, ensuring the physical compactness of the hydrated matter and also the fixation of some toxic elements. Further binders tested for immobilization properties were clinkers with other types of anionic substitutions in belite and alite (SO3) or other cement types (e.g., calciumaluminate - CAC), their mixtures with supplementary additives (sorbents, additives changing the Ca/Si ratio of C-S-H gel, or substance providing phosphorus for formation of insoluble compounds with apatite structure). The prepared binders were mixed with water doped with various toxic elements; after a defined period of cement stone hydration the specimens were subjected to long-term testing of leachability of individual toxic elements. The research methods involved besides leaching tests were also optical and electron microscopy. Proceedings of the 6th International Conference on Sustainable Solid Waste Management, Naxos, Greece, 13-16 June 2018, p 6

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20500 - Materials engineering

Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2018

Kód důvěrnosti údajů

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