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Anti-fatigue modified asphalt and preparation method thereof

A modified asphalt and anti-fatigue technology, applied in building components, building thermal insulation materials, buildings, etc., can solve the problem that the anti-fatigue performance cannot meet the design requirements of the service life of the asphalt pavement, achieve excellent anti-fatigue cracking ability, improve Dispersion uniformity, the effect of improving fatigue cracking resistance

Inactive Publication Date: 2019-09-24
CHANGAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of anti-fatigue modified asphalt and its preparation method, which solves the defect that the anti-fatigue performance of the existing waste rubber powder modified asphalt cannot meet the design requirements of the service life of asphalt pavement

Method used

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  • Anti-fatigue modified asphalt and preparation method thereof
  • Anti-fatigue modified asphalt and preparation method thereof

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preparation example Construction

[0033] A kind of preparation method of anti-fatigue modified asphalt provided by the invention comprises the following steps:

[0034] Step 1, in parts by mass, weigh 100 parts of base asphalt, 18 to 22 parts of waste tire rubber powder, 0.5 parts of plasticizer, 0.4 to 1.6 parts of polyphosphoric acid, 0.2 parts of compatibilizer and 0.1 part of stabilizer agent;

[0035] Step 2, heating the weighed base asphalt to 160-165°C, then adding waste tire rubber powder into the base asphalt, and stirring at 160-165°C for 15 minutes;

[0036] Step 3: Continue to add compatibilizer and stabilizer on the basis of step 2, and keep stirring at 160-165°C for 10 minutes, and then use high-speed shearing machine to cut the above-mentioned asphalt for 45 minutes at 170-180°C , then add polyphosphoric acid and plasticizer and continue to shear at this temperature for 30 minutes, with a shear rate of 5000-6000 revolutions / min.

[0037] Step 4: On the basis of Step 3, put the prepared modifie...

Embodiment 1

[0039] A kind of anti-fatigue modified asphalt provided in this embodiment comprises 100 parts of base asphalt, 18 parts of waste tire rubber powder, 0.5 part of plasticizer, 0.4 part of polyphosphoric acid, 0.2 part of compatibilizer and 0.1 part of stabilizer agent. .

[0040] A preparation method of anti-fatigue modified asphalt, comprising the following steps:

[0041] Step 1: heating base asphalt to 160-165°C, then adding waste tire rubber powder into base asphalt, and stirring at 160-165°C for 15 minutes.

[0042] Step 2: Continue to add compatibilizer and stabilizer on the basis of step 1, and keep stirring at 160-165°C for 10 minutes, and then use a high-speed shear to shear the above-mentioned asphalt for 45 minutes at a temperature of 170-180°C , then add polyphosphoric acid and plasticizer and continue to shear at this temperature for 30 minutes, with a shear rate of 5000-6000 revolutions / min.

[0043] Step 3: On the basis of Step 2, put the prepared modified asp...

Embodiment 2

[0045] A kind of anti-fatigue modified asphalt provided in this embodiment comprises 100 parts of base asphalt, 22 parts of waste tire rubber powder, 0.5 part of plasticizer, 1.6 parts of polyphosphoric acid, 0.2 part of compatibilizer and 0.1 part of stabilizer agent.

[0046] A preparation method of anti-fatigue modified asphalt, comprising the following steps:

[0047] Step 1: heating base asphalt to 160-165°C, then adding waste tire rubber powder into base asphalt, and stirring at 160-165°C for 15 minutes.

[0048] Step 2: Continue to add compatibilizer and stabilizer on the basis of step 1, and keep stirring at 160-165°C for 10 minutes, and then use a high-speed shear to shear the above-mentioned asphalt for 45 minutes at a temperature of 170-180°C , then add polyphosphoric acid and plasticizer and continue to shear at this temperature for 30 minutes, with a shear rate of 5000-6000 revolutions / min.

[0049] Step 3: On the basis of Step 2, put the prepared modified aspha...

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Abstract

The invention provides anti-fatigue modified asphalt and a preparation method thereof. The anti-fatigue modified asphalt comprises 100 parts of matrix asphalt, 18-22 parts of waste tire rubber powder, 0.5 part of a plasticizer, 0.4-1.6 parts of polyphosphoric acid, 0.2 part of a compatilizer and 0.1 part of a stabilizer. On the basis of the waste tire rubber powder modified asphalt, by adding the plasticizer and the polyphosphoric acid, the disadvantage of low high-temperature stability of the waste tire rubber powder modified asphalt is well relieved, hydroxyl, imidogen, sulfydryl and other active groups in asphalt molecules chemically react with the polyphosphoric acid, the original micelle structure of asphaltene is broken, the dispersion uniformity of the asphaltene in asphalt light components is improved, a stable spatial network is easily formed, the modulus of the asphalt is enhanced, the viscoelastic properties of the asphalt are thus improved, and the high-temperature stability and the anti-fatigue performance of the asphalt are improved. The resistance to fatigue cracking is further improved, and on the premise of high high and low-temperature performance, the modified asphalt is high in resistance to fatigue cracking.

Description

technical field [0001] The invention belongs to the technical field of road building materials, and in particular relates to a fatigue-resistant modified asphalt and a preparation method thereof. Background technique [0002] With the extensive application of asphalt pavement in high-grade highways, the proportion of heavy-duty traffic and channelized traffic is also gradually increasing, which leads to a large number of fatigue cracks and other pavement diseases in the service period of asphalt pavement, which seriously affects the service quality of the road. Therefore, it is the main problem to be solved at this stage to study a new type of road asphalt material or improve the original road material to improve its road performance. [0003] Because the traditional single waste tire rubber powder modified asphalt has obvious advantages in low temperature crack resistance, but it has certain disadvantages in high temperature anti-rutting and anti-fatigue performance, which ...

Claims

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Application Information

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IPC IPC(8): C08L95/00C08L19/00C08K3/32C08K5/11C08K3/22C04B26/26
CPCC04B26/26C08K2003/2296C08K2003/329C08L95/00C08L2205/03C08L2207/24C08L2555/50C08L2555/52C08L19/003C08K3/32C08K5/11C08K3/22C04B18/12C04B14/02
Inventor 马峰李永波杨田田傅珍潘健李杰孙启宇冯乔
Owner CHANGAN UNIV
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