Additive for asphalt mixes containing reclaimed bituminous products
AssigneeArkema France
InventorsJuan Antonio Gonzalez Leon, Gilles Barreto, Vincent Luca
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Abstract
The present invention relates to a method of improving the incorporation of recycled bituminous products by using at least one surfactant as an alternative to the known rejuvenating oils, for the preparation of asphalt mixes containing recycled bituminous products. The use of such alternative surfactant(s) results in better mechanical properties of the asphalt mix, while using smaller amounts of fresh bitumen and greater amounts of recycled bituminous products.
Claims35
A process for the preparation of an asphalt mix comprising a fraction of at least one recycled bituminous product, which comprises mixing the at least one recycled bituminous product including RAP or RAS with at least one non-ionic or cationic surfactant, present in amounts that range from 0.05 wt % to 10 wt % with respect to the total mass of bitumen present in the final asphalt mix, such that the at least one surfactant is directly added to the at least one recycled bituminous product and results in improved mechanical properties of the mix, when present, and obtaining the asphalt mix, wherein the asphalt mix is free of rejuvenating oil, the surfactant amount facilitates the mixing of the aged binder present in recycled bituminous products with fresh bitumen used in the preparation of asphalt mixes, and the fraction of recycled bituminous product(s) is present in amounts from about 5 wt % to 99.5 wt % of the total mass of the final asphalt mix.
A process for the preparation of an asphalt mix comprising a fraction of at least one recycled bituminous product including RAP or RAS, which comprises mixing at least one non-ionic or cationic surfactant, present in amounts that range from 0.05 wt % to 10 wt % with respect to the total mass of bitumen present in the final asphalt mix, with the at least one recycled bituminous product such that the at least one surfactant is directly added to the at least one recycled bituminous product, and the asphalt mix is free of rejuvenating oil, and mixing the at least one surfactant and the at least one recycled bituminous product from the first mixing step with fresh bitumen, wherein the fresh bitumen content is less than 5.5 percent and the fraction of recycled bituminous product(s) is present in amounts from about 5 wt % to 99.5 wt % of the total mass of the final asphalt mix.
A process for the preparation of an asphalt mix comprising a fraction of at least one recycled bituminous product including RAP or RAS, which comprises mixing the at least one recycled bituminous product with at least one non-ionic or cationic surfactant such that the at least one surfactant, present in amounts that range from 0.05 wt % to 10 wt % with respect to the total mass of bitumen present in the final asphalt mix, is directly added to the at least one recycled bituminous product, wherein the at least one surfactant results in improved mechanical properties of the mix, and the surfactant amount facilitates the mixing of the aged binder present in recycled bituminous products with fresh bitumen used in the preparation of asphalt mixes and the fraction of recycled bituminous product(s) is present in amounts from about 5 wt % to 99.5 wt % of the total mass of the final asphalt mix, and obtaining the asphalt mix, wherein the asphalt mix is free of rejuvenating oils selected from the group consisting of aliphatic oils, fatty acids, fatty acid esters, and synthetic and natural phenolic compounds.
Dependencies are inferred from the claim text.