A kind of asphalt for tunnel pavement and preparation method thereof

A kind of asphalt and pavement technology, which is applied in the direction of building components, building insulation materials, buildings, etc., can solve the problems of asphalt's low-temperature crack resistance, influence, and the contribution of asphalt's high-temperature stability, so as to reduce the maintenance cycle and improve durability. non-toxic, excellent flame retardant and smoke suppression effect

Active Publication Date: 2021-07-27
CHANGAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, organic rectorite can improve the high-temperature stability of asphalt, and has better thermal storage stability in asphalt, but has a negative impact on the low-temperature crack resistance of asphalt
Polyurethane can significantly improve the low-temperature crack resistance of bitumen, but contribute little to the high-temperature stability of bitumen

Method used

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  • A kind of asphalt for tunnel pavement and preparation method thereof
  • A kind of asphalt for tunnel pavement and preparation method thereof

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preparation example Construction

[0031] A preparation method for tunnel pavement asphalt, specifically comprising the following steps:

[0032] Step 1), first heating the base asphalt to a molten state, then sequentially adding organic rectorite and composite additives into the molten base asphalt and stirring evenly to obtain a mixture A;

[0033] Step 2), mixing polyurethane prepolymer and anti-aging agent to obtain mixture B, adding mixture B to mixture A and mixing uniformly to obtain mixture C;

[0034] Step 3), finally adding the flame retardant to the mixture C, and mixing evenly to obtain the required tunnel pavement asphalt.

[0035] Further, in step 1), the base asphalt is heated to a molten state at 130°C-160°C, and then the organic rectorite and composite additives are sequentially added to the melted base asphalt, stirring at 1000-2000r / min during the addition process Stir at high speed; in the process of adding compound additives, add in small amounts several times in order to stir evenly;

[...

Embodiment 1

[0039] Step 1. Heat 500g of asphalt to 135°C, slowly add 5g of organic rectorite at a stirring speed of 2000r / min, then add 0.5g of maleic anhydride and 2.5g of aromatic diamine chain extender and stir for 2min to obtain mixture A ;

[0040] Step 2. At a stirring rate of 2000r / min, slowly add a mixture B of 25g of polyurethane prepolymer and 0.05g of tetraerythritol ester at 90°C to mixture A, and keep stirring at 135°C for 10min at 2000r / min to obtain a mixture C;

[0041] Step 3. Finally, add 1.25 g of dimethyl methylphosphonate at 1000 r / min, continue to maintain the temperature and speed and stir for 2 minutes to obtain modified asphalt.

Embodiment 2

[0043] Step 1. Heat 500g of asphalt to 130°C, slowly add 7g of organic rectorite at a stirring speed of 1000r / min, then add 0.7g of maleic anhydride and 3.5g of aromatic diamine chain extender and stir for 5min to obtain mixture A ;

[0044] Step 2. At a stirring rate of 2000r / min, slowly add a mixture B of 35g of polyurethane prepolymer and 0.1g of antioxidant 1010 at 90°C to the mixture A, and keep stirring at 135°C for 10min at 2000r / min to obtain a mixture C;

[0045] Step 3. Finally, add 1.75 g of dimethyl methylphosphonate at 1000 r / min, continue to maintain the temperature and speed and stir for 2 minutes to obtain modified asphalt.

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Abstract

The invention discloses an asphalt used for tunnel pavement and a preparation method thereof. By mixing base asphalt, organic rectorite, polyurethane prepolymer, composite additives, anti-aging agent, and flame retardant according to the mass fraction ratio, the prepared Add different additives at different stages, select organic rectorite with excellent barrier properties to modify asphalt, improve the flame retardant and smoke suppression, high temperature, and anti-aging properties of asphalt, and select polyurethane with excellent plasticity to obtain modified Compared with the traditional SBS modified asphalt, the asphalt system has better high and low temperature performance and flame retardant and smoke suppression effects. It can not only improve the durability of the pavement, but also meet the technical specifications of highway asphalt pavement construction technical specifications. Used in the tunnel pavement, it can significantly improve its service life, reduce the maintenance cycle, and effectively avoid the occurrence of tunnel pavement fires to ensure driving safety. Because the asphalt designed with this composition has excellent ductility, it can also be used for bridge deck pavement asphalt surface.

Description

technical field [0001] The invention belongs to the technical field of novel modified asphalt materials, and in particular relates to an asphalt used for tunnel pavement and a preparation method thereof. Background technique [0002] As of the end of 2017, the total mileage of highways in my country was 4.77 million kilometers, of which the total mileage of expressways has exceeded 135,000 kilometers. Asphalt pavement accounts for more than 95% of the built expressways. Due to the shortcomings of matrix asphalt, which is easy to soften at high temperature and brittle at low temperature, it needs to be modified to meet the pavement performance. The most commonly used asphalt modifier is SBS modifier. During the construction process, SBS modified asphalt will produce a lot of smoke, and the flame retardancy is poor. Fundamentally speaking, the smoke is mainly produced by the asphalt binder. To reduce the smoke of asphalt, modified The agent must have the effect of preventin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L95/00C08L75/08C08K9/04C08K3/34
CPCC08L95/00C08L2201/08C08L75/08C08K9/04C08K3/34
Inventor 张增平贾猛刘祥朱永彪王封
Owner CHANGAN UNIV
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