Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
METHOD OF TREATING AN ALKALINE GRANULAR CARBONATABLE MATERIAL
The invention concerns a method of treating an alkaline granular carbonatable material which contains aluminium metal and which has in particular a pH of at least 10. The method comprises an oxidation step wherein at least a portion of said aluminium metal is oxidized by contact with moisture. The aluminium should be oxidized to avoid swelling problems when using the granular material as aggregate. In the method according to the invention this oxidation is accelerated by providing at least one oxidizing agent in said moisture, which oxidizing agent has a higher redox potential than the water contained in said moisture. The method further comprises a carbonation step wherein the granular carbonatable material is at least partially carbonated to lower the pH thereof. In this way the formation of ettringite, which may also release aluminium ions which causing further swelling problems, can be avoided in the granular material or any ettringite present therein can be destabilized.
METHOD OF TREATING AN ALKALINE GRANULAR CARBONATABLE MATERIAL
The invention concerns a method of treating an alkaline granular carbonatable material which contains aluminium metal and which has in particular a pH of at least 10. The method comprises an oxidation step wherein at least a portion of said aluminium metal is oxidized by contact with moisture. The aluminium should be oxidized to avoid swelling problems when using the granular material as aggregate. In the method according to the invention this oxidation is accelerated by providing at least one oxidizing agent in said moisture, which oxidizing agent has a higher redox potential than the water contained in said moisture. The method further comprises a carbonation step wherein the granular carbonatable material is at least partially carbonated to lower the pH thereof. In this way the formation of ettringite, which may also release aluminium ions which causing further swelling problems, can be avoided in the granular material or any ettringite present therein can be destabilized.
METHOD OF TREATING AN ALKALINE GRANULAR CARBONATABLE MATERIAL
VERFAHREN ZUR BEHANDLUNG EINES ALKALINSCHES KORNIGES MATERIAL
PROCEDE DE TRAITEMENT D'UNE MATIERE ALKALINE PARTICULAIRE CARBONATABLE
DESCAMPS PHILIPPE (Autor:in) / LECOMTE ISABELLE (Autor:in) / NGUYEN EVELYNE (Autor:in) / VAN MECHELEN DIRK (Autor:in)
21.06.2017
Patent
Elektronische Ressource
Englisch
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