Additive for asphalt mixes containing reclaimed bituminous products
AssigneeArkema France
InventorsJuan Antonio Gonzalez Leon, Gilles Barreto, Vincent Luca
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Abstract
Presented is 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.
Claims23
A process for the preparation of an asphalt mix, comprising mixing together, in any order:
- (a) fresh aggregate,
- (b) fresh bitumen,
- (c) at least one recycled bituminous product containing aged bitumen and reclaimed aggregate, and
- (d) at least one surfactant, which surfactant functions as a rejuvenator of the said aged bitumen and the at least one surfactant is of formula A1:
- [A-O—B—]dZ (A1)
- wherein:
- A is chosen from hydrogen and a group G or
- G represents a linear or branched, saturated or unsaturated, C1-C30 hydrocarbon chain, optionally containing at least one aromatic cycle, and optionally substituted by at least one phosphate group,
- B represents a bond or a divalent group containing at least one alkylene oxide repeating unit,
- d represents 1 or 2, and
- Z represents a radical of formula Z1 or Z2:
- wherein R is hydrogen or a linear or branched C1-C6 alkyl, f is 0 or 1 or 2, e is 0 or 1, and d+e+f is 3, provided that when d is 2, then Z is Z1, e is 0 and P is linked to two identical or different groups [A-O—B—], and provided that in the case where d is 1, Z may also represent hydrogen or a group G or
- and wherein the mixing involves 2 wt % to 5.5 wt % of the fresh bitumen with respect to the total weight of the fresh and reclaimed aggregate, and with the mixing resulting in an asphalt mix with an indirect tensile strength (ITS) of at about 2.0 or more MPa, measured using an Instron universal testing machine on compression at a 50 mm/min rate at a temperature of 20° C.
A process for the preparation of an asphalt mix, comprising mixing together, in any order:
- (a) fresh aggregate,
- (b) fresh bitumen,
- (c) at least one recycled bituminous product containing aged bitumen and reclaimed aggregate, and
- (d) at least one surfactant, which surfactant functions as a rejuvenator of the said aged bitumen, and the at least one surfactant is of formula A1:
- [A-O—B—]dZ (A1)
- wherein:
- A is chosen from hydrogen and a group G or
- G represents a linear or branched, saturated or unsaturated, C1-C30 hydrocarbon chain, optionally containing at least one aromatic cycle, and optionally substituted by at least one phosphate group,
- B represents a bond or a divalent group containing at least one alkylene oxide repeating unit,
- d represents 1 or 2, and
- Z represents a radical of formula Z1 or Z2:
- wherein R is hydrogen or a linear or branched C1-C6 alkyl, f is 0 or 1 or 2, e is 0 or 1, and d+e+f is 3, provided that when d is 2, then Z is Z1, e is 0 and P is linked to two identical or different groups [A-O—B—], and provided that in the case where d is 1, Z may also represent hydrogen or a group G or
- and wherein the fraction of recycled bituminous product(s) represents from about 10 wt % to about 80 wt %, of the total mass of the final asphalt mix, and the fraction of fresh aggregate represents about 5 wt % to about 75 wt % relative to the total mass of the final asphalt mix.
Dependencies are inferred from the claim text.