Modified asphalts with enhanced rheological properties and associated methods
AssigneeMarathon Petroleum Company LP
InventorsCristian Clopotel, Donald Siler, Brian Wilt
Life of this patent
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Abstract
A modified asphalt binder with improved elastic properties and methods of making such modified asphalt binder. The modified asphalt binders may include one or more of an asphalt binder, a solvent deasphalted (SDA) pitch, a polymeric material, and optionally, a ground tire rubber. The disclosed modified asphalt binders exhibit properties consistent with decreased susceptibility to rutting and thus may be used in asphalt concrete applications.
Claims13
A modified asphalt binder comprising an asphalt binder, a solvent deasphalted pitch, and a polymeric material, the modified asphalt binder having:
- a viscosity of from about 1900 poise to about 3000 poise at 60° C. (140° F.),
- a G*/sin delta value in excess of 1.0 kPa at temperatures ranging from 64° C. to 67° C.,
- a non-recoverable creep compliance 3.2 kPa (Jnr3.2) value of < 4.5 kPa-1 at 64° C. and/or at 67° C.,
- a penetration of from about 45 to about 77 dmm at 25° C., where dmm represents 0.1 mm of penetration as measured with a penetrometer under ASTM D5, and
- a softening point greater than about 50° C.
A modified asphalt binder comprising an asphalt binder, a solvent deasphalted (SDA) pitch, and a polymeric material, the asphalt binder, prior to modification, having a performance grade (PG) designation of from PG 64-22 to PG 67-22, and the SDA pitch having one or more of (a) a penetration of from 0-10 dmm or (b) a softening point of from about 210° F. to about 240° F.
A modified asphalt binder comprising an asphalt binder, a solvent deasphalted (SDA) pitch, and a polymeric material, the SDA pitch having one or more of (a) a penetration of from 0-10 dmm or (b) a softening point of from about 210° F. to about 240° F.
A modified asphalt binder comprising an asphalt binder, a solvent deasphalted (SDA) pitch, and a polymeric material, the SDA pitch being present in an amount from about 1% to about 6% by weight, based on total weight of the asphalt binder and SDA.
A modified asphalt binder comprising an asphalt binder, a solvent deasphalted (SDA) pitch, and a polymeric material with styrene-butadiene (SB) or styrene-butadiene-styrene (SBS) copolymers having a polymerized butadiene content by weight of at least about 70%.
A modified asphalt binder comprising an asphalt binder, a solvent deasphalted (SDA) pitch, and styrene-butadiene latex, the SDA pitch comprising an amount from about 5% to about 6% by weight, based on total weight of the modified asphalt binder.
A modified asphalt binder comprising an asphalt binder, a solvent deasphalted (SDA) pitch, ground tire rubber in an amount from about 7% to about 15% by weight, based on total weight of the modified asphalt binder, and styrene-butadiene-styrene (SBS) triblock copolymer in an amount from about 0.4% to about 0.6% by weight, based on the total weight of the modified asphalt binder.
A modified asphalt binder comprising an asphalt binder, a solvent deasphalted pitch, ground tire rubber in an amount from about 5% to about 15% by weight, based on total weight of the modified asphalt binder, and a SBS triblock copolymer in an amount from about 0.4% to about 0.6% by weight, based on the total weight of the modified asphalt binder.
An asphalt concrete pavement composition comprising:
- a modified asphalt binder containing an asphalt binder, a solvent deasphalted pitch, and a polymeric material, the modified asphalt binder being present in an amount from about from 0.5% to about 20% by weight, based on total weight of the asphalt concrete pavement composition;
- and
- an aggregate material, the aggregate material includes one or more materials selected from the group consisting of stone, gravel, expanded aggregate, shells, ground silica, recycled asphalt, or Portland cement pavement.
A method for producing an asphalt binder, the method comprising:
- i) combining a solvent deasphalted pitch, heated to a temperature of from about 150° C. to about 250° C.;
- and an asphalt binder, heated to a temperature of from about 150° C. to about 250° C., to form a first combination;
- ii) mixing the first combination to form a first mixture at a first physical location;
- iii) combining with the first mixture a polymeric material selected from styrene-butadiene (SB) copolymers, styrene-butadiene-styrene (SBS) copolymers, or combinations thereof, to form a second combination at a second different physical location;
- iv) mixing the second combination to form a SDA-polymer modified asphalt binder;
- v) adding ground tire rubber to the SDA-polymer modified asphalt binder to form a third combination;
- and
- vi) mixing the third combination to form a SDA-polymer-GTR modified asphalt binder.
Dependencies are inferred from the claim text.