Asphalt for tunnel pavement and preparation method thereof

A technology of pavement and asphalt, which is applied in the field of new modified asphalt materials, can solve the problems of influence, unfavorable low-temperature crack resistance of asphalt, and little contribution to high-temperature stability of asphalt, so as to improve durability, reduce maintenance cycle, and improve resistance. The effect of burning and suppressing smoke

Active Publication Date: 2018-12-28
CHANGAN UNIV
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  • Summary
  • 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 cracking resistance of asphalt, but has little contribution to the high-temperature stability of asphalt

Method used

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  • Asphalt for tunnel pavement and preparation method thereof
  • Asphalt for tunnel pavement and preparation method thereof

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[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 adding organic rectorite and composite additives in the molten base asphalt and stirring to obtain mixture A;

[0033] Step 2), polyurethane prepolymer and anti-aging agent are mixed to obtain mixture B, mixture B is added in mixture A and mixed 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;

[0036] In step 2), in...

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 polyurethane prepolymer and 0.05g tetraerythritol ester at 90°C to mixture A, and keep stirring at 135°C for 10min at 2000r / min to obtain mixture C;

[0041] Step 3, finally add 1.25g dimethyl methylphosphonate at 1000r / min, continue to keep the temperature and speed and stir for 2min 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 polyurethane prepolymer and 0.1g antioxidant 1010 at 90°C to mixture A, and keep stirring at 135°C for 10min at 2000r / min to obtain mixture C;

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

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Abstract

The invention discloses an asphalt for a tunnel pavement and a preparation method thereof. By mixing matrix asphalt, organized rectorite, a polyurethane prepolymer, a composite additive, an antiagingagent and a fire retardant according to the mass percentage, adding different assistants at different preparation stages and selecting the organized rectorite having excellent barrier property, asphalt is modified, the flame retardant, smoke suppressing, high temperature resisting and anti-aging properties of the asphalt are improved, polyurethane having excellent plasticity is selected, an obtained modified asphalt system has more excellent high and low temperature properties and flame retardant and smoke suppressing effects compared with traditional SBS modified asphalt, the durability of the tunnel pavement can be improved, and various technical indexes all meet the requirements of technical specification for construction of highway asphalt pavements. In the use of the tunnel pavement,the service life of the tunnel pavement is remarkably prolonged, a maintenance period is shortened, tunnel pavement fire disasters are effectively avoided, traffic safety is ensured, the designed asphalt has outstanding ductility and can be also used as an asphalt surface course for bridge deck pavement.

Description

technical field [0001] The invention belongs to the technical field of novel modified asphalt materials, and in particular relates to asphalt 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 base 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 its flame retardancy is poor. Fundamentally speaking, the smoke is mainly produced by asphalt binder. To reduce the smoke of asphalt, modify The agent must have the effect of preventing the generation...

Claims

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Application Information

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Patent Type & Authority Applications(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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