Method for manufacturing asphalt comprising rubber from end-of-life tires
AssigneeBridgestone Europe NV/SA
InventorsLuca Lelio, Massimo Losa, Pietro Leandri
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Abstract
A method for producing asphalt comprising a heat treatment step, wherein the rubber granules deriving from an end-of-life tyre granulation process are subjected to a temperature of between 80 and 300° C., for a period of time necessary in order to obtain rubber granules with a density of between 1.0 and 1.5 g/cm3; and a mixing step wherein the rubber granules from the heat treatment step are mixed with stone aggregate and bitumen in order to obtain asphalt.
Claims16
A method for producing asphalt comprising:
- a heat treatment step, wherein first rubber granules deriving from an end-of-life tire granulation process are subjected to a temperature of between 8° and 300° C., for a period of time such that second rubber granules are obtained with a density of between 1.0 and 1.5 g/cm3;
- and
- a mixing step wherein the second rubber granules are mixed with stone aggregate and bitumen to obtain asphalt,
- wherein the mixing step comprises a first mixing operation wherein the stone aggregate and the bitumen are mixed together at a temperature of between 15° and 200° C., and a second mixing operation wherein the second rubber granules are added to the mixture from the first mixing operation.
Rubber granules and/or powder deriving from an end-of-life tire granulation process, which have dimensions to pass through a sieve having meshes with dimensions up to 10 mm and that are subjected during a heat treatment step to a temperature of between 8° and 300° C. for a period of time to obtain rubber granules and/or powder with a density of between 1.0 and 1.5 g/cm3, further subjected to a mixing step comprising a first mixing operation wherein the stone aggregate and the bitumen are mixed together at a temperature of between 150 and 200° C., and a second mixing operation wherein the second rubber granules are added to the mixture from the first mixing operation.
A method for producing asphalt comprising:
- a heat treatment step, wherein first rubber granules deriving from an end-of-life tire granulation process are subjected to a temperature of between 8° and 300° C., for a period of time such that second rubber granules are obtained with a density of between 1.0 and 1.5 g/cm3;
- and
- a mixing step wherein the second rubber granules are mixed with stone aggregate and bitumen to obtain asphalt,
- wherein the second rubber granules constitute from 1 to 30% by volume of a quantity of inert material comprised within the asphalt.
Dependencies are inferred from the claim text.