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Nanometer composite material modified asphalt, preparation method thereof, and asphalt concrete

A technology of nano-composite materials and modified asphalt, which is applied in the fields of asphalt concrete and nano-composite modified asphalt, which can solve the problems of inability to ensure uniform dispersion of graphene, inability to ensure solvent removal, cumbersome preparation, etc., to improve low-temperature freeze-thaw resistance Ability, improve anti-aging ability, the effect of simple process

Inactive Publication Date: 2019-08-09
重庆市市政设计研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the one hand, because the preparation of industrialized graphene is relatively cumbersome, and graphene needs to be oxidized by strong acid, the price of graphene oxide is higher than that of other materials. At present, there are preliminary studies on the direct synthesis of graphene substitutes from carbon tar. Exploration, but its product is relatively low, and the product only accounts for 12-18% of the raw material; on the other hand, it is also affected by the strong van der Waals force on the surface, such as graphene directly added to asphalt, which is very easy to agglomerate
Chinese invention patent CN20180502137.5 discloses that graphene is added to a mixed solution of absolute ethanol and polyvinylpyrrolidone, and the above solution is ultrasonically oscillated and then added to asphalt for shearing, which belongs to the solution blending method, but in this method The solvent removal process only relies on baking and evaporation, which cannot guarantee solvent removal, and a single shear cannot ensure that graphene is evenly dispersed

Method used

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  • Nanometer composite material modified asphalt, preparation method thereof, and asphalt concrete
  • Nanometer composite material modified asphalt, preparation method thereof, and asphalt concrete
  • Nanometer composite material modified asphalt, preparation method thereof, and asphalt concrete

Examples

Experimental program
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Effect test

Embodiment 1

[0037] A: A preparation method for graphene oxide, comprising the steps of:

[0038] 1) Fully mix 0.5 parts of 70# base asphalt with 1.5 parts of calcium carbonate, put the mixture into a crucible, and heat it under standard atmospheric pressure and air atmosphere with a heating rate of 5°C / min, a heating temperature of 300°C, and a heating time of 4h, natural cooling;

[0039] 2) Add 100 parts of hydrochloric acid with a mass concentration of 37% to the above mixture to remove residual calcium carbonate, and then add 100 parts of hydrochloric acid with a mass concentration of 37% to carry out secondary repeated treatment after crystals are precipitated, and then adjust the pH of the mixture with distilled water The value is 6.5, let stand overnight, and finally evaporate to dryness to obtain graphene oxide.

[0040] B: A preparation method of graphene oxide / styrene-butadiene rubber compound, calculated in parts by mass, said graphene oxide / styrene-butadiene rubber compound c...

Embodiment 2

[0051] A: A preparation method for graphene oxide, comprising the steps of:

[0052] 1) Fully mix 1 part of 70# base asphalt with 2.5 parts of calcium carbonate, put the mixture into a crucible, and heat it under standard atmospheric pressure and air atmosphere with a heating rate of 15°C / min, a heating temperature of 500°C, and a heating time of 4h, natural cooling;

[0053] 2) Add 100 parts of hydrochloric acid with a mass concentration of 38% to the above mixture to remove residual calcium carbonate, and then add 100 parts of hydrochloric acid with a mass concentration of 38% to carry out secondary repeated treatment after crystals are precipitated, and then adjust the pH of the mixture with distilled water The value is 7.5, let stand overnight, and finally evaporate to dryness to obtain graphene oxide.

[0054] B: A preparation method of graphene oxide / styrene-butadiene rubber compound, calculated in parts by mass, said graphene oxide / styrene-butadiene rubber compound com...

Embodiment 3

[0065] A: A preparation method for graphene oxide, comprising the steps of:

[0066] 1) Fully mix 0.75 parts of 70# base asphalt with 2 parts of calcium carbonate, put the mixture into a crucible, and heat it under standard atmospheric pressure and air atmosphere with a heating rate of 10°C / min, a heating temperature of 400°C, and a heating time of 4h, natural cooling;

[0067] 2) Add 100 parts of hydrochloric acid with a mass concentration of 37.5% to the above mixture to remove residual calcium carbonate, and then add 100 parts of hydrochloric acid with a mass concentration of 37.5% to carry out secondary repeated treatment after crystals are precipitated, and then adjust the pH of the mixture with distilled water The value was 7, left to stand overnight, and finally evaporated to dryness to obtain graphene oxide.

[0068] B: A preparation method of graphene oxide / styrene-butadiene rubber compound, calculated in parts by mass, said graphene oxide / styrene-butadiene rubber co...

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Abstract

The invention provides a nanometer composite material modified asphalt. The nanometer composite material modified asphalt comprises, by mass, 100 parts of matrix asphalt and 2 to 6 parts of a modifier; the modifier is a graphene oxide / styrene-butadiene rubber composite material, and comprises 100 parts of graphene oxide / styrene-butadiene rubber compound, 15 to 30 parts of carbon black, 2 to 6 parts of magnesium oxide, 3 to 6 parts of stearic acid, 2 to 3 parts of magnesium carbonate, 3 to 5 parts of an anti-aging agent, 3 to 7 parts of an accelerator and 1 to 3 parts of sulfur; the graphene oxide / styrene-butadiene rubber compound comprises 0.1 to 1 part of graphene oxide and 15 to 20 parts of styrene-butadiene latex. The nanometer composite material modified asphalt possesses high heat stability at high temperature, and excellent freezing and thawing resistance, anti-rutting performance, and aging resistance at low temperature, and possesses excellent durability.

Description

technical field [0001] The invention belongs to the technical field of road engineering, and in particular relates to a nanocomposite material modified asphalt, a preparation method thereof and asphalt concrete. Background technique [0002] The traditional asphalt pavement mixture is mostly matrix asphalt mixture, and the external conditions during road construction and use have a great impact on the durability of the pavement structure. For example, under the influence of high temperature during construction, asphalt mixture is prone to short-term aging in the process of mixing, transportation, and paving; Damage and other diseases greatly reduce the durability of asphalt pavement. Due to the above reasons, within a few years after the roads in many areas are opened to traffic, there are endless diseases and have to be repaired. The current polymer asphalt often has one or more outstanding performances, but it cannot fully meet the needs of road mixing and spreading. Sho...

Claims

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Application Information

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IPC IPC(8): C08L95/00C08L9/08C08K3/04C08K3/22C08K5/09C08K13/02C04B26/26C04B111/20
CPCC04B26/26C04B2111/0075C04B2111/20C04B2111/29C08L95/00C08L9/08C08K3/042C08K3/22C08K5/09C08K13/02C04B14/024C04B24/2676C04B14/022C04B14/304C04B24/085C04B22/02C04B2103/60C04B2103/0068C04B14/28C04B18/141C04B20/0048C04B14/14
Inventor 张德鹏石鸿付育文杨靖吴世曾陈兴波庞彬彬
Owner 重庆市市政设计研究院有限公司