Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Aditivo para cemento, composición de cemento y método de reducción del cromo hexavalente que los utiliza
Una mezcla de cemento, caracterizada por comprender un material de expansión y una sustancia que contiene sulfato de estaño, el material de expansión que contiene cal libre, anhidrita de sulfato de calcio y uno o dos o más compuestos hidráulicos seleccionados a partir de hauyne, silicato de calcio, ferrito aluminato cálcico y ferrito cálcico, en la que la citada sustancia que contiene sulfato está contenida en una cantidad de 0,2 a 8 partes en masa - calculada en base a sulfato de estaño - en un total de 100 partes en masa de dicho material de expansión y dicha sustancia que contiene sulfato de estaño.
The invention provides a cement admixture that improves the ability of concrete to bring about high initial strength, works in favor of enhancing the effect on hexavalent chromium reductions, and is less likely to decrease in the effect on hexavalent chromium reductions even upon storage as well as a method for reducing hexavalent chromium. The invention is embodied as (1) A cement admixture, characterized by comprising an expanding material containing free lime, a hydraulic compound and calcium sulfate anhydrite, and a tin sulfate-containing substance; (2) The cement admixture according to (1), characterized in that the tin sulfate-containing substance is contained in an amount of 0.2 to 8 parts by mass - as calculated on a tin sulfate basis - in a total of 100 parts by mass of the expanding material and the tin sulfate-containing substance; (3) The cement admixture according to (1) or (2), characterized in that the expanding material has been treated with carbon dioxide gas to form calcium carbonate therein; (4) The cement admixture according to any one of (1) to (3), characterized in that the expanding material has been surface treated with a shrinkage reducer; (5) A cement composition, characterized by containing cement, and the cement admixture according to any one of (1) to (4); and (6) A method for reducing hexavalent chromium, characterized by use of the cement composition according to (5).
Aditivo para cemento, composición de cemento y método de reducción del cromo hexavalente que los utiliza
Una mezcla de cemento, caracterizada por comprender un material de expansión y una sustancia que contiene sulfato de estaño, el material de expansión que contiene cal libre, anhidrita de sulfato de calcio y uno o dos o más compuestos hidráulicos seleccionados a partir de hauyne, silicato de calcio, ferrito aluminato cálcico y ferrito cálcico, en la que la citada sustancia que contiene sulfato está contenida en una cantidad de 0,2 a 8 partes en masa - calculada en base a sulfato de estaño - en un total de 100 partes en masa de dicho material de expansión y dicha sustancia que contiene sulfato de estaño.
The invention provides a cement admixture that improves the ability of concrete to bring about high initial strength, works in favor of enhancing the effect on hexavalent chromium reductions, and is less likely to decrease in the effect on hexavalent chromium reductions even upon storage as well as a method for reducing hexavalent chromium. The invention is embodied as (1) A cement admixture, characterized by comprising an expanding material containing free lime, a hydraulic compound and calcium sulfate anhydrite, and a tin sulfate-containing substance; (2) The cement admixture according to (1), characterized in that the tin sulfate-containing substance is contained in an amount of 0.2 to 8 parts by mass - as calculated on a tin sulfate basis - in a total of 100 parts by mass of the expanding material and the tin sulfate-containing substance; (3) The cement admixture according to (1) or (2), characterized in that the expanding material has been treated with carbon dioxide gas to form calcium carbonate therein; (4) The cement admixture according to any one of (1) to (3), characterized in that the expanding material has been surface treated with a shrinkage reducer; (5) A cement composition, characterized by containing cement, and the cement admixture according to any one of (1) to (4); and (6) A method for reducing hexavalent chromium, characterized by use of the cement composition according to (5).
Aditivo para cemento, composición de cemento y método de reducción del cromo hexavalente que los utiliza
20.02.2019
Patent
Elektronische Ressource
Spanisch
IPC:
C04B
Kalk
,
LIME
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