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US 7,811,372 B2Granted
Rejuvenating agent and process for recycling of asphalt
AssigneeShell Oil Company
InventorsSophie Nigen-Chaidron, Laurent Porot
Life of this patent
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Abstract
A rejuvenating agent having a viscosity of from 200 to 60000 cSt at 60° C. and comprising 10-90 weight % palm oil and 90-10 weight % bitumen, where the percentages are based upon the total weight of the composition, is disclosed. The rejuvenating agent is suitable for use in hot in-place and hot in-plant recycling processes.
Claims44
A process for recycling an asphalt pavement, wherein the process comprises the steps of:
- a) heating and milling the asphalt pavement to provide a milled asphalt pavement;
- b) heating a rejuvenating agent or a composition comprising a rejuvenating agent and a polymer selected from the group consisting of styrenic block copolymers, olefinic copolymers, polyurethane and polyether-polyester copolymers, wherein the rejuvenating agent has a viscosity of from 200 to 60000 cSt (2×10−4 to 6×10−2 m2s−1) at 60° C. and comprises 10-90 weight % palm oil and 90-10 weight % bitumen, where the weight percentages are based upon the total weight of the composition to provide either a hot rejuvenating agent or a hot composition;
- c) adding either the hot rejuvenating agent or the hot composition to the milled asphalt pavement and mixing to provide a rejuvenated asphalt mix;
- and
- d) forming a rejuvenated asphalt pavement with the rejuvenated asphalt mix.
2 more elements
A process for recycling a reclaimed asphalt pavement, wherein the process comprises the steps of:
- milling the reclaimed asphalt pavement to provide a milled asphalt pavement;
- heating virgin aggregate;
- heating a rejuvenating agent or a composition comprising a rejuvenating agent and a polymer selected from the group consisting of styrenic block copolymers, olefinic copolymers, polyurethane and polyether-polyester copolymers, wherein the rejuvenating agent has a viscosity of from 200 to 60000 cSt (2×10−4 to 6×10−2 m2s−1) at 60° C. and comprises 10-90 weight % palm oil and 90-10 weight % bitumen, where the percentages are based upon the total weight of the composition to provide either a hot rejuvenating agent or a hot composition;
- and
- adding either the hot rejuvenating agent or the hot composition and the hot virgin aggregate the milled reclaimed asphalt pavement and mixing to provide a rejuvenated asphalt mix.
2 more elements
A composition, comprising:
- a rejuvenating agent, comprising bitumen, having a penetration value in the range of from 10 to 300 1/10 mm at 25° C., as measured in accordance with EN 1426, and palm oil;
- wherein the ratio of said bitumen and said palm oil in said rejuvenating agent is such as to provide said rejuvenating agent having a viscosity in the range of from 200 cSt to 60,000 cSt at 60° C. but with said palm oil being present in said rejuvenating agent in an amount in the range of from 10 to 90 weight % of said rejuvenating agent and said bitumen being present in said rejuvenating agent in an amount in the range of from 10 to 90 weight % of said rejuvenating agent.
A process, comprising:
- milling an asphalt pavement to provide a milled asphalt pavement;
- mixing with said milled asphalt pavement to thereby provide a rejuvenated asphalt mixture, a juvenating agent, wherein said rejuvenating agent comprises bitumen, having a penetration value in the range of from 10 to 300 1/10 mm at 25° C., as measured in accordance with EN 1426, and palm oil, and wherein the ratio of said bitumen and said palm oil in said rejuvenating agent is such as to provide said rejuvenating agent having a viscosity in the range of from 200 cSt to 60,000 cSt at 60° C. but with said palm oil being present in said rejuvenating agent in an amount in the range of from 10 to 90 weight % of said rejuvenating agent and said bitumen being present in said rejuvenating agent in an amount in the range of from 10 to 90 weight % of said rejuvenating agent;
- and
- forming a rejuvenated asphalt pavement with said rejuvenated asphalt mixture.
1 more element
Dependencies are inferred from the claim text.