# US 11,299,632 B2 · Road making material, a method of producing a road making material and a road made therefrom

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- Number: US 11,299,632 B2
- Document ID: US11299632B2
- Status: Granted
- Kind: B2
- Application number: 16/763,055
- Filed: 2018-11-12
- Published: 2020-12-17
- Granted: 2022-04-12
- Earliest claimed: 2017-11-13
- Assignees: Macrebur Limited
- Applicants: Macrebur Limited
- Inventors: Nicholas Peter Burnett; Gordon Michael Reid; Toby Jon McCartney
- Web page: https://patentgrep.com/patent/US11299632B2

## CPC

- C08L 95/00: Compositions of bituminous materials, e.g. asphalt, tar, pitch
- E01C 7/22: Binder incorporated in hot state, e.g. heated bitumen
- E01C 7/26: mixed with other materials, e.g. cement, rubber, leather, fibre {(fibrous material reinforcements for bituminous paving E01C11/165)}
- C08L 2207/062: HDPE
- C08L 2207/066: LDPE (radical process)
- C08L 2555/22: Asphalt produced above 140°C, e.g. hot melt asphalt
- C08L 2555/86: Polymers containing aliphatic hydrocarbons only, e.g. polyethylene, polypropylene or ethylene-propylene-diene copolymers
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- E01C: CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR (forming roads or like surfaces by compacting or grading snow or ice E01H)

## Abstract

The present invention relates to a road making material comprising aggregate, bitumen, and a plastics material, wherein: (a) when the road making material is 10 mm stone mastic asphalt, the bitumen comprises at least 4.7% but no more than 5.69% by weight of the aggregate, bitumen, and plastics material mix; (b) when the road making material is 6 mm, 10 mm, or 20 mm asphaltic concrete, the bitumen comprises at least 3.1% but no more than 4.09% by weight of the aggregate, bitumen, and plastics material mix; (c) when the road making material is hot rolled asphalt, the bitumen comprises at least 4.9% but no more than 5.89% by weight of the aggregate, bitumen, and plastics material mix; or (d) when the road making material is heavy duty 32 mm, the bitumen comprises at least 2.4% but no more than 3.39% by weight of the aggregate, bitumen, and plastics material mix.

## Claims

### Claim 1

A method of producing a road making material comprising:
(a) heating aggregate;
(b) heating bitumen;
(c) mixing aggregate and 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;
wherein the plastics material comprises high density polyethylene (HDPE) or low density polyethylene (LDPE);
wherein:
(a) the road making material is 10 mm stone mastic asphalt, the bitumen comprises at least 4.7% but no more than 5.69% by weight of the aggregate, bitumen, and plastics material mix;
(b) the road making material is 6 mm, 10 mm, or 20 mm asphaltic concrete, the bitumen comprises at least 3.1% but no more than 4.09% by weight of the aggregate, bitumen, and plastics material mix;
(c) the road making material is hot rolled asphalt, the bitumen comprises at least 4.9% but no more than 5.89% by weight of the aggregate, bitumen, and plastics material mix; or
(d) the road making material is heavy duty 32 mm, the bitumen comprises at least 2.4% but no more than 3.39% by weight of the aggregate, bitumen, and plastics material mix.

### Claim 2 (depends on 1)

The method of claim 1, wherein the aggregate is heated to 130° C.-180° C.

### Claim 3 (depends on 1)

The method of claim 1, wherein the bitumen is heated to 130° C.-180° C.

### Claim 4 (depends on 1)

The method of claim 1, wherein the aggregate is heated to 165° C.

### Claim 5 (depends on 1)

The method of claim 1, wherein the bitumen is heated to 165° C.

### Claim 6 (depends on 1)

The method of claim 1, wherein the plastics material is at ambient temperature when added to the aggregate and bitumen mixture.

### Claim 7 (depends on 1)

The method of claim 1 further comprising, heating the plastics material to 120° C.-180° C. before mixing with aggregate and bitumen.

### Claim 8 (depends on 1)

The method of claim 1, wherein the plastics material is heated to 165° C.

### Claim 9 (depends on 1)

The method of claim 1, wherein the aggregate, bitumen, and plastics material are mixed for at least 30 seconds.

### Claim 10 (depends on 1)

The method of claim 1, wherein the aggregate, bitumen, and plastics material are mixed for at least 45 seconds.

### Claim 11 (depends on 1)

The method of claim 1, wherein the plastics material is a blend comprising high density polyethylene (HDPE) and low density polyethylene (LDPE).

### Claim 12 (depends on 11)

The method of claim 11, wherein said blend comprises 50% high density polyethylene (HDPE) by weight and 50% low density polyethylene (LDPE) by weight, with no other plastics materials or contaminants present in the blend.

### Claim 13 (depends on 1)

The method of claim 1, wherein the plastics material is a blend comprising polyvinyl butyral (PVB).

### Claim 14 (depends on 1)

The method of claim 1, wherein the plastics material is a blend comprising styrene isoprene styrene (SIS).

### Claim 15 (depends on 1)

The method of claim 1, wherein 3 kg of the plastics material is present per 1 tonne of roadmaking material.