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Preparation method of normal-temperature regenerated anti-crack waste asphalt mixture

A waste asphalt and mixture technology, which is applied in the field of normal temperature regeneration and anti-cracking waste asphalt mixture and its preparation, can solve the problems of increased effective bonding components, reduced pavement anti-skid ability, and reduced anti-rutting ability, so as to improve fusion ability, Effects of improving rheological properties and increasing utilization

Active Publication Date: 2022-02-25
GAOYUAN HIGHWAY MAINTENANCE TECH HENAN PROV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical principle of this commonly used rejuvenator is to reduce the viscosity of old asphalt, and its negative effects lead to a sharp decline in the adhesion and cohesion of asphalt, and under high temperature conditions, it will lead to a serious decline in the deformation resistance of the mixture
For example, Patent No. FR2976288B1 discloses a regenerated binder (an organic combination of regenerated agent and binder-asphalt), which can better plastically regenerate old asphalt, but the regenerated binder has certain Application limitations, this patent is applicable to the residual binder content of asphalt aggregate between 3.5% and 5.5%, that is, the content of old asphalt in waste asphalt mixture is between 3.5% and 5.5%
This shows that when the old asphalt content in the waste asphalt mixture is less than 3.5%, the performance of the mixture is insufficient, especially its cracking resistance and The ability to resist water damage needs to be improved
When the old asphalt content in the waste asphalt mixture is greater than 5.5%, since the mixture itself contains a high amount of old asphalt, if the recycled binder is added, the effective bonding component will increase, resulting in the performance of the mixture being "soft" ( lead to a decrease in the anti-rutting ability), and at the same time, the road surface is prone to oil flooding in the later stage (resulting in a decrease in the anti-skid ability of the road surface)
To sum up, the cracking resistance, water damage resistance and high temperature deformation resistance of the recycled binder recycled asphalt mixture are insufficient, and need to be further improved

Method used

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  • Preparation method of normal-temperature regenerated anti-crack waste asphalt mixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Stir and shear 90Kg of epoxy plasticizer epoxy soybean oil, 2Kg of C5 petroleum resin and 5Kg of modifier maleic anhydride at 100°C for 50min so as to mix them uniformly to obtain polymerized oil; (2) at 90°C Next, the polymer oil prepared by step (1) is quickly mixed and miscible with 90Kg and active toughening agent amino-terminated liquid nitrile rubber 10Kg on a shearing machine to obtain a high-toughness filling polymer oil; (3) the step (2) The obtained high-toughness filling polymer oil was cooled to 35°C, and an aqueous solution of vinyltriethoxysilane with a mass concentration of 10% surfactant was added, stirred and mixed evenly, and cured for 200 minutes to obtain the product room temperature anti-crack regeneration agent.

Embodiment 2

[0031] (1) Stir and shear 85Kg of epoxy plasticizer epoxy soybean oil, 3Kg of C9 petroleum resin and 3Kg of modifier maleic anhydride at 95°C for 60min to mix them uniformly to obtain polymerized oil; (2) at 80°C Next, the polymer oil prepared by step (1) is quickly mixed and miscible with 80Kg and active toughening agent amino-terminated liquid nitrile rubber 20Kg on a shearing machine to obtain a high-toughness filled polymer oil; (3) the step (2) The obtained high-toughness filled polymer oil was cooled to 30°C, and an aqueous solution of vinyltriethoxysilane with a mass concentration of 1% surfactant was added, stirred and mixed evenly, and cured for 300 minutes to obtain the product room temperature anti-crack regeneration agent.

Embodiment 3

[0033] (1) Stir and shear 96Kg of epoxy plasticizer epoxy soybean oil, 1Kg of C5 petroleum resin and 7Kg of modifier maleic anhydride at 105°C for 60min to mix them uniformly to obtain polymerized oil; (2) at 100°C Next, the polymer oil prepared by step (1) is quickly mixed and miscible with 100Kg and active toughening agent amino-terminated liquid nitrile rubber on a shearing machine to obtain a high-toughness filling polymer oil; (3) the step (2) The obtained high-toughness filling polymer oil was cooled to 40°C, and an aqueous solution of vinyltriethoxysilane with a mass concentration of 20% surfactant was added, stirred and mixed evenly, and cured for 30 minutes to obtain the product room temperature anti-crack regeneration agent.

[0034] Select waste asphalt concrete milled from municipal roads. The test proportioning scheme is shown in Table 1. First, add the normal temperature anti-cracking rejuvenator prepared in Example 1 to the recycled waste asphalt mixture and mix ...

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Abstract

The invention discloses a preparation method of a normal-temperature regenerated anti-crack waste asphalt mixture. The preparation method comprises the following steps: stirring a plasticizer epoxidized soybean oil, petroleum resin and a modifier maleic anhydride at 95-105 DEG C to uniformly mix to obtain polymerized oil; quickly mixing and dissolving 80-100 parts by weight of polymeric oil and 1-20 parts by weight of an active toughening agent on a shearing machine under the condition of 80-100 DEG C to obtain high-toughness filling polymeric oil; cooling the high-toughness filling polymeric oil to 30-40 DEG C, adding a surfactant vinyltriethoxysilane aqueous solution, uniformly stirring and mixing, and curing to obtain a normal-temperature anti-crack regenerant. The normal-temperature anti-crack regenerant not only can fully activate aged asphalt, but also can improve the cracking resistance and water damage resistance of a cold recycled asphalt mixture together with interface enhanced emulsified asphalt and pre-hydrated cement. According to the invention, the crack resistance and water damage resistance of the regenerated waste asphalt mixture are superior to those of the conventional regenerated asphalt pavement.

Description

technical field [0001] The invention belongs to the technical field of normal temperature regenerated anti-cracking waste asphalt mixture and cold regenerated asphalt mixture recycling technology, in particular to a normal temperature regenerated anti-cracking waste asphalt mixture and a preparation method thereof. Background technique [0002] During the renovation process of highway asphalt pavement, a huge amount of waste asphalt mixture will be produced. The main treatment methods are thermal regeneration or cold regeneration. The above-mentioned treatment methods often have problems such as insufficient asphalt regeneration and low performance of the recycled mixture. Therefore, how to effectively utilize the old asphalt in the waste asphalt mixture is an important key technology. [0003] During the use of asphalt mixture pavement, the asphalt will age due to the physical or chemical effects of the external environment, and the chemical composition or mechanical proper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/42C04B28/02
CPCC04B40/0039C04B28/02C04B2201/50C04B2111/0075C04B2111/00017C04B24/281C04B24/24C04B24/06C04B18/22C04B24/42C04B24/36C04B18/16C04B2103/0068
Inventor 张庆侯德华尚波李忠玉刘玉恒左献宝
Owner GAOYUAN HIGHWAY MAINTENANCE TECH HENAN PROV
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