CALCIUM NITRATE FOR REDUCING THE PORE SIZE DISTRIBUTION OF A HARDENED CEMENTITIOUS COMPOSITION AND STEEL REINFORCED CONCRETE HAVING AN ELEVATED RESISTANCE TOWARDS CARBONATION

    公开(公告)号:US20190071367A1

    公开(公告)日:2019-03-07

    申请号:US15767177

    申请日:2016-11-10

    Abstract: The invention relates to the use of calcium nitrate to reduce the pore size distribution of a hardened cementitious composition, preferably, a hardened concrete composition, wherein the cementitious (concrete) composition comprises between 1 weight % to 4 weight % of calcium nitrate of the cement content of the cementitious composition, depending on the type of cement. This results in a reduced permeability for the set cementitious (concrete) composition for carbon dioxide (CO2) and thus an elevated resistance towards carbonation. The invention furthermore relates to a method for producing such a hardened cementitious (concrete) composition and a pourable and curable (wet) concrete composition. The invention also relates to a steel reinforced concrete solid having an elevated resistance towards carbonation and a method for producing a steel reinforced concrete solid having an elevated resistance towards carbonation.

    Corrosion inhibition of metal reinforcement present in a hardened concrete construction having one or more surfaces that are exposed to chloride intrusion

    公开(公告)号:US12281051B2

    公开(公告)日:2025-04-22

    申请号:US17600809

    申请日:2020-04-03

    Abstract: A method for the corrosion inhibition, and optionally rehabilitation, of metal reinforcements present in a hardened concrete construction having one or more surfaces that are exposed to chloride intrusion, wherein the method comprises the step of applying an aqueous alkali metal nitrate solution, an aqueous alkaline earth metal nitrate solution, an aqueous zinc nitrate solution, an aqueous aluminium nitrate solution, an aqueous ammonium nitrate solution or a mixture thereof on one or more of the surfaces. The present disclosure also relates to the use of an aqueous alkali metal nitrate solution, an aqueous alkaline earth metal nitrate solution, an aqueous zinc nitrate solution, an aqueous aluminium nitrate solution, an aqueous ammonium nitrate solution or a mixture thereof as a corrosion inhibitor by applying it on one or more surfaces of hardened concrete construction comprising metal reinforcements that are exposed to chloride intrusion. Furthermore, the present disclosure relates to a corrosion inhibiting composition for inhibition of corrosion of metal reinforcements present in a hardened concrete construction having one or more surfaces that are exposed to chloride intrusion.

    Prevention of the emission of hydrogen sulphide in the production of hot bitumen or asphalt

    公开(公告)号:US11046895B2

    公开(公告)日:2021-06-29

    申请号:US16611230

    申请日:2018-07-17

    Abstract: The present application relates to a method to prevent the emission of hydrogen sulphide in the production of hot bitumen or asphalt having a temperature of between 150 and 200° C., wherein the method comprises the steps of providing a bituminous or asphalt mixture, heating the mixture until a temperature of between 150-200° C. and adding an aqueous calcium nitrate solution or a calcium nitrate powder while mixing the bituminous or asphalt mixture. The present application furthermore relates to the use of an aqueous calcium nitrate solution or a calcium nitrate powder during mixing of a bituminous or asphalt mixture in the production of a hot bitumen or asphalt having a temperature of between 150 and 200° C. to prevent the emission of hydrogen sulphide.

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