Asphalt mixture
View Patent ↗A phosphorescent asphalt mixture comprising a binder, aggregate and a phosphorescent compound is disclosed. The phosphorescent compound has formula MAl 2 O 4 , wherein M is chosen from Sr, Ba and Ca, and wherein the phosphorescent compound has been doped with at least one rare earth element.
1. A phosphorescent asphalt mixture comprising a binder, aggregate and a phosphorescent compound, wherein the phosphorescent compound has a formula of MAl 2 O 4 , wherein M is chosen from Sr, Ba and Ca, and wherein the phosphorescent compound has been doped with at least one rare earth element.
2. An asphalt mixture according to claim 1 , wherein the binder is a clear synthetic binder.
3. An asphalt mixture according to claim 1 , wherein the binder is a bituminous binder.
4. An asphalt mixture according to claim 3 , wherein the phosphorescent compound is strontium aluminate doped with at least one rare earth element.
5. An asphalt mixture according to claim 4 , wherein the phosphorescent compound is doped with europium and optionally with additional rare earth elements.
6. An asphalt mixture according to claim 5 , wherein the amount of phosphorescent compound in the asphalt mixture is from 0.1 to 10 wt %, based upon the weight of the asphalt mixture.
7. A process for preparing an asphalt mixture, wherein said process comprises the steps of:
(a) mixing a binder with an aggregate to form a mixture; and
(b) mixing a phosphorescent compound with the mixture, wherein steps (a) and (b) are simultaneous, or step (b) is after step (a) to thereby form the asphalt mixture, wherein said phosphorescent compound has a formula of MAl 2 O 4 , wherein M is chosen from Sr, Ba and Ca, and wherein the phosphorescent compound has been doped with at least one rare earth element.
8. A process according to claim 7 , wherein said binder is a bituminous binder.
9. A process according to claim 8 , wherein said phosphorescent compound is strontium aluminate doped with at least one rare earth element.
10. A process according to claim 9 , wherein said phosphorescent compound is doped with europium.
11. A process according to claim 9 , wherein the amount of said phosphorescent compound in said asphalt mixture is in the range of from 0.1 to 10 wt %, based upon the weight of the asphalt mixture.
12. A process according to claim 7 , wherein said binder is a clear synthetic binder.
13. A process according to claim 12 , wherein said phosphorescent compound is strontium aluminate doped with at least one rare earth element.
14. A process according to claim 13 , wherein said phosphorescent compound is doped with europium.
15. A process according to claim 14 , wherein the amount of said phosphorescent compound in said asphalt mixture is in the range of from 0.1 to 10 wt %, based upon the weight of the asphalt mixture.
16. An asphalt mixture according to claim 2 , wherein said phosphorescent compound is strontium aluminate doped with at least one rare earth element.
17. An asphalt mixture according to claim 16 , wherein said phosphorescent compound is doped with europium.
18. An asphalt mixture according to claim 17 , wherein the amount of said phosphorescent compound in said asphalt mixture is in the range of from 0.1 to 10 wt %, based upon the weight of the asphalt mixture.