Road making material comprising PVC, a method of producing said road making material and a road made therefrom
The present invention provides a method for producing a road making material and a road making material, the road making material comprising more than 10% polyvinylchloride (PVC) by weight and the polyvinylchloride having a glass transition temperature of no more than 180° C.
1. A method of producing a road making material comprising:
(a) heating aggregate;
(b) heating bitumen;
(c) mixing the aggregate and the bitumen to form an aggregate and bitumen mixture;
(d) adding a plastics material to the aggregate and bitumen mixture; and
(e) mixing to incorporate the plastics material with the aggregate and bitumen mixture to form an aggregate, bitumen, and plastics material mix;
wherein the plastics material comprises at least 80% polyvinylchloride (PVC) by weight;
wherein a ratio of the bitumen to the plastics material is from 9:1 to 19:1 by weight; and
wherein the aggregate, bitumen, and plastics material mix comprises from 2.4% to 5.89% of the bitumen with the proviso that:
the bitumen is in an amount from 4.7 wt. % to 5.69 wt. % of the weight of the aggregate, bitumen, and plastics material mix for the road making material to be 10 mm stone mastic asphalt;
the bitumen is in an amount from 3.1 wt. % to 4.09 wt. % of the weight of the aggregate, bitumen, and plastics material mix for the road making material to be 6 mm, 10 mm, or 20 mm asphaltic concrete;
the bitumen is in an amount from 4.9 wt. % to 5.89 wt. % of the weight of the aggregate, the bitumen, and plastics material mix for the road making material to be hot rolled asphalt; or
the bitumen is in an amount from 2.4 wt. % to 3.39 wt. % of the amount of the aggregate, the bitumen, and plastics material mix for the road making material to be heavy duty 32 mm.
2. The method of claim 1 , wherein the aggregate and/or bitumen is heated to 130° C.-180° C.
3. The method of claim 1 , wherein the aggregate and/or bitumen is heated to 165° C.
4. The method of claim 1 , wherein the plastics material is added to the aggregate and bitumen mixture at ambient temperature.
5. The method of claim 1 , wherein the aggregate, bitumen, and plastics material are mixed for at least 30 seconds.
6. The method of claim 1 , wherein the plastics material comprises at least 50% polyvinylchloride (PVC) by weight.
7. The method of claim 1 , wherein the plastics material is obtained by a method comprising stripping an insulation from electrical cables, wherein the insulation comprises polyvinylchloride.
8. The method of claim 7 , wherein the polyvinylchloride is plasticised polyvinylchloride and/or has a glass transition temperature of between 80° C. and 180° C. and/or wherein the plastics material comprising polyvinylchloride has a melting point of between 100° C. and 200° C.
9. The method of claim 1 , wherein an amount of plastics material is 2 kg to 4 kg in each tonne of asphalt and/or wherein 3 kg of the plastics material is present per 1 tonne of road making material.
10. The road making material of claim 1 , wherein the aggregate comprises at least 94.1% by weight of the aggregate, bitumen, and plastics material mix with the proviso that:
the aggregate comprises at least 94.3% by weight of the aggregate, bitumen, and plastics material mix for the road making material to be 10 mm stone mastic asphalt; the aggregate comprises at least 95.9% by weight of the aggregate, bitumen, and plastics material mix for the road making material to be 6 mm, 10 mm, or 20 mm asphaltic concrete;
the aggregate comprises at least 94.1% by weight of the aggregate, bitumen, and plastics material mix for the road making material to be hot rolled asphalt; or
the aggregate comprises at least 96.6% by weight of the aggregate, bitumen, and plastics material mix for the road making material to be heavy duty 32 mm.
11. The road making material of claim 1 , wherein the plastics material comprises no more than 10% contaminant plastics by weight, said contaminant plastics having a glass transition temperature of greater than 180° C.
12. A method for making a road surface from a road making material, the method comprising:
(a) heating aggregate;
(b) heating bitumen;
(c) mixing the aggregate and the bitumen to form an aggregate and bitumen mixture;
(d) adding a plastics material to the aggregate and bitumen mixture;
(e) mixing to incorporate the plastics with the aggregate and bitumen mixture to form a mixture of plastics, aggregate and bitumen to form an aggregate, bitumen, and plastics material mix;
wherein the plastics material comprises at least 80% polyvinylchloride (PVC) by weight; and wherein a ratio of the bitumen to the plastics material is from 9:1 to 19:1 by weight; and
(f) laying the mixture of plastics, aggregate and bitumen to form a road surface, and
wherein the aggregate, bitumen, and plastics material mix comprises from 2.4% to 5.89% of the bitumen with the proviso that:
the bitumen is in an amount from 4.7 wt. % to 5.69 wt. % of the weight of the aggregate, bitumen, and plastics material mix for the road making material to be 10 mm stone mastic asphalt;
the bitumen is in an amount from 3.1 wt. % to 4.09 wt. % of the weight of the aggregate, bitumen, and plastics material mix for the road making material to be 6 mm, 10 mm, or 20 mm asphaltic concrete;
the bitumen is in an amount from 4.9 wt. % to 5.89 wt. % of the weight of the aggregate, the bitumen, and plastics material mix for the road making material to be hot rolled asphalt; or
the bitumen is in an amount from 2.4 wt. % to 3.39 wt. % of the amount of the aggregate, the bitumen, and plastics material mix for the road making material to be heavy duty 32 mm.
13. A method of producing a road making material comprising:
forming a road making material from an aggregate, bitumen, and plastics material mix a comprising aggregate, bitumen and a plastics material,
wherein:
wherein the plastics material comprises at least 80% polyvinylchloride (PVC) by weight:
wherein a ratio of the bitumen to the plastics material is from 9:1 to 19:1 by weight; and
wherein the aggregate, bitumen, and plastics material mix comprises from 2.4% to 5.89% of the bitumen with the proviso that:
the bitumen is in an amount from 4.7 wt. % to 5.69 wt. % of the weight of the aggregate, bitumen, and plastics material mix for the road making material to be 10 mm stone mastic asphalt;
the bitumen is in an amount from 3.1 wt. % to 4.09 wt. % of the weight of the aggregate, bitumen, and plastics material mix for the road making material to be 6 mm, 10 mm, or 20 mm asphaltic concrete;
the bitumen is in an amount from 4.9 wt. % to 5.89 wt. % of the weight of the aggregate, the bitumen, and plastics material mix for the road making material to be hot rolled asphalt; or
the bitumen is in an amount from 2.4 wt. % to 3.39 wt. % of the amount of the aggregate, the bitumen, and plastics material mix for the road making material to be heavy duty 32 mm.