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Polyolefin-based asphalt mixture additive and preparation method thereof

A technology for olefin-based asphalt and mixtures, which is applied in building thermal insulation materials, building components, buildings, etc., can solve the problems of weakening the thickness of the asphalt layer, rutting hazards and hazards on asphalt pavements, and achieves improved anti-aging performance and improved anti-rutting performance. , Good effect of high temperature resistance

Inactive Publication Date: 2017-01-04
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The rutting hazard of asphalt pavement has become an urgent problem to be solved in the field of road engineering. The appearance of rutting on asphalt pavement will seriously affect the service ability of the pavement structure, in addition to directly affecting the smoothness of the road surface and driving safety, and because the thickness of the asphalt layer at the wheel tracks is weakened , which weakens the overall strength of the surface layer and pavement structure, and will further induce other hazards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Polyolefin-based asphalt mixture additive raw material components and mass ratio: PE particles (high-density polyethylene, melting point 140°C) 40%, PP particles (melting point 160°C) 30%, dilauryl thiodipropionate 0.3%, Dioctyl phthalate 0.2%, nano-silica particles (pre-dispersed in acetone) 4.5%, calcium sulfate whiskers (density 2.3g / cm 3 , length 100-200 μm) 25%.

[0020] Mix the above raw materials evenly and put them into a twin-screw extruder, melt and extrude them at a cylinder temperature of 200°C, a host speed of 40r / min, and a feeding rate of 60r / min, then pelletize and dry to obtain asphalt pavement anti-rutting additive.

[0021] Add the polyolefin-based asphalt mixture additive prepared in this example to the AC-13 type asphalt mixture, and the mixing amount is 0.5% of the asphalt mixture quality, and the dynamic stability of the prepared asphalt mixture specimen is tested as 3310 / mm. Because dilauryl thiodipropionate is added as an antioxidant in this ...

Embodiment 2

[0023] Polyolefin-based asphalt mixture additive raw material components and mass ratio: PE granules (low density polyethylene, melting point 120°C) 50%, PP granules 30%, dilauryl thiodipropionate 0.4%, diphthalate Octyl ester 0.1%, nano-silica particles (pre-dispersed in acetone) 4.5%, calcium sulfate whiskers 15%.

[0024] Mix the above raw materials evenly and put them into a twin-screw extruder, melt and extrude them under the conditions of a cylinder temperature of 180°C, a host speed of 50r / min, and a feeding rate of 30r / min, then pelletize and dry to obtain asphalt pavement anti-rutting additive.

[0025] The polyolefin-based asphalt mixture additive prepared in this example was added to the AC-13 type asphalt mixture, and the mixing amount was 0.5% of the asphalt mixture quality, and the dynamic stability of the prepared asphalt mixture specimen was measured It is 3452 / mm.

Embodiment 3

[0027] Polyolefin-based asphalt mixture additive raw material components and mass ratio: PE granules (high-density polyethylene) 40%, PP granules 35%, dilauryl thiodipropionate 0.2%, dioctyl phthalate 0.3% , nano-silica particles (pre-dispersed in ether) 4.5%, calcium sulfate whiskers 20%.

[0028] Mix the above raw materials evenly and put them into a twin-screw extruder, melt and extrude them under the conditions of a cylinder temperature of 1230°C, a host speed of 50r / min, and a feeding rate of 60r / min, then pelletize and dry to obtain asphalt pavement anti-rutting additive.

[0029] The polyolefin-based asphalt mixture additive prepared in this example was added to the AC-13 type asphalt mixture, and the mixing amount was 0.5% of the asphalt mixture quality, and the dynamic stability of the prepared asphalt mixture specimen was measured It is 3125 / mm.

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Abstract

The invention relates to a polyolefin-based asphalt mixture additive and a preparation method thereof. The anti-rutting additive is prepared from the following raw materials in percentage by weight: 70-85% of modified polyolefin granules, 10-25% of inorganic salt whisker, 1-5% of nano silica, 0.1-0.5% of a plasticizer and 0.1-0.5% of an antioxidant. All the raw material components are uniformly mixed at normal temperature and normal pressure and then are added into a twin-screw extruder, melting extrusion is carried out under the conditions that temperature of barrel is 180-230 DEG C, rotating speed of a main engine is 30-50r / min and feeding rate is 30-60r / min, and then grain-sized dicing and drying are carried out, so that the polyolefin-based asphalt mixture additive is obtained. The prepared road asphalt anti-rutting additive can effectively improve anti-rutting and anti-aging properties of asphalt mixture, so that high temperature anti-rutting property of the asphalt mixture can be greatly improved.

Description

technical field [0001] The invention belongs to the technical field of road asphalt mixture additives, and relates to a polyolefin-based asphalt mixture additive and a preparation method thereof. Background technique [0002] The rutting hazard of asphalt pavement has become an urgent problem in the field of road engineering. The appearance of rutting on asphalt pavement will seriously affect the service ability of the pavement structure. In addition to directly affecting the smoothness of the road surface and driving safety, and because the thickness of the asphalt layer at the wheel tracks weakens , which weakens the overall strength of the surface layer and pavement structure, and will further induce other hazards. By adding an anti-rutting agent to the asphalt mixture, the high-temperature stability of the asphalt can be improved due to multiple functions such as viscosification, reinforcement, filling, asphalt modification, and elastic recovery of the aggregate surface,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08L23/06C08L23/08C08L23/12C08K13/04C08K5/372C08K5/12C08K3/36C08K7/08
CPCC08K2201/004C08K2201/011C08L95/00C08L2201/08C08L2205/03C08L2207/062C08L2207/066C08L2555/86C08L23/06C08L23/12C08K13/04C08K5/372C08K5/12C08K3/36C08K7/08C08L23/0815
Inventor 李相国韩延昭刘卓霖蹇守卫任钊锋杨蓉明添
Owner WUHAN UNIV OF TECH
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