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Modified asphalt for improving low temperature performances of surface layer of high-speed railway full-section asphalt concrete reinforced bedding, and making method thereof

A technology of asphalt concrete and modified asphalt, which is applied in the direction of building insulation materials, building components, buildings, etc., can solve the problems of accelerated modification of asphalt concrete, easy to highlight brittle cracks, difficult to adapt, etc., to achieve easy production control and low price , to ensure the effect of stability and safety

Inactive Publication Date: 2017-10-13
CHINA RAILWAYS CORPORATION +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the main modified asphalt products used in railway and highway asphalt concrete in severe cold areas in my country are SBR modified asphalt, SBS modified asphalt, etc. The above-mentioned asphalts have good service performance in the general low temperature environment in my country, but these modified asphalts are difficult Adapt to the extremely low temperature environment as low as -48°C in the Mokka high-speed railway, and it is easy to highlight material performance problems such as brittle cracks
At the same time, the above-mentioned conventional asphalt binders are more likely to accelerate the deterioration of the performance of modified asphalt concrete under the high-frequency load of high-speed trains, and are prone to large settlement deformation. Performance Modified Bitumen

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0020] The preparation method of the modified asphalt for improving the low-temperature performance of the surface layer of the high-speed railway full-face asphalt concrete reinforced base bed of the present invention includes the following steps:

[0021] 1) Heat the No. 110 base asphalt to about 180°C to a fully flowing state. Slowly add a predetermined component of the SBS modifier to the No. 110 base asphalt. During the addition, use a glass rod to manually continuously stir until the SBS modifier Disperse evenly in No. 110 base asphalt;

[0022] 2) Increase the temperature of the mixture to 190℃, and use a high-speed shearing emulsifying mixer to shear at a high speed of 4000r / min for 0.5h to make the SBS modifier and No. 110 base asphalt fully miscible;

[0023] 3) Simultaneously add the rubber oil and polyphosphoric acid of the predetermined components to the mixture, and manually stir for 1 to 2 minutes;

[0024] 4) Gradually add powdered styrene-butadiene rubber to the prede...

Embodiment 1

[0026] Modified asphalt is prepared from raw materials with the following weight ratios:

[0027] No. 110 base asphalt 78.8%, SBS modifier 4%; powder styrene butadiene rubber 8%, rubber oil 8%, polyphosphoric acid 1.2%.

[0028] The modified asphalt and its preparation method have the following steps:

[0029] 1) Heat the No. 110 base asphalt to about 180°C to a fully flowing state. Slowly add a predetermined component of the SBS modifier to the No. 110 base asphalt. During the addition, use a glass rod to manually continuously stir to the SBS modifier. Disperse evenly in No. 110 base asphalt;

[0030] 2) Increase the temperature of the mixture to 190℃, and use a high-speed shearing emulsifying mixer to shear at a high speed of 4000r / min for 0.5h to make the SBS modifier and No. 110 base asphalt fully miscible;

[0031] 3) Simultaneously add the rubber oil and polyphosphoric acid of the predetermined components to the mixture, and manually stir for 1 to 2 minutes;

[0032] 4) Gradually ...

Embodiment 2

[0035] Modified asphalt is prepared from raw materials with the following weight ratios:

[0036] No. 110 matrix asphalt 82.8%, SBS modifier 4%; powder styrene butadiene rubber 4%, rubber oil 8%, polyphosphoric acid 1.2%.

[0037] The modified asphalt and its preparation method have the following steps:

[0038] 1) Heat the No. 110 base asphalt to about 180°C to a fully flowing state. Slowly add a predetermined component of the SBS modifier to the No. 110 base asphalt. During the addition, use a glass rod to manually continuously stir until the SBS modifier Disperse evenly in No. 110 base asphalt;

[0039] 2) Increase the temperature of the mixture to 190℃, and use a high-speed shearing emulsifying mixer to shear at a high speed of 4000r / min for 0.5h to make the SBS modifier and No. 110 base asphalt fully miscible;

[0040] 3) Simultaneously add the rubber oil and polyphosphoric acid of the predetermined components to the mixture, and manually stir for 1 to 2 minutes;

[0041] 4) Gradua...

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Abstract

The invention relates to a modified asphalt for improving the low temperature performances of the surface layer of a high-speed railway full-section asphalt concrete reinforced bedding, and a making method thereof. The modified asphalt can remarkably improve the low temperature performances of the surface layer of the high-speed railway full-section asphalt concrete reinforced bedding in an extreme low temperature environment. The modified asphalt is made from, by weight, 73-95% of No.110 matrix asphalt, 1-5% of an SBS modifier, 2-10% of powdery styrene butadiene rubber, 2-10% of rubber oil and 0.3-1.5% of polyphosphoric acid.

Description

Technical field [0001] The invention relates to the technical field of high-speed railway asphalt, in particular to a modified asphalt for improving the low-temperature performance of the surface layer of a high-speed railway full-section asphalt concrete reinforced base bed and a preparation method thereof. Background technique [0002] The surface layer of the full-face asphalt concrete reinforced subgrade refers to the structural layer between the track bottom plate and the subgrade bed, and is an important part of the layered composite system under the rail foundation. The application of railway asphalt concrete starts with the waterproof and drainage layers on both sides of the roadbed surface, and then develops to the surface layer of the full-section reinforced subgrade. The setting of the surface layer of the full-face asphalt concrete reinforced subgrade effectively improves the structural combination, stiffness matching and material properties of the under-track foundat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08L53/02C08L9/06C08L91/00C08K3/32
CPCC08L95/00C08K2003/329C08L53/02C08L9/06C08L91/00C08K3/32
Inventor 薛元李安洪张东卿赖紫辉邱延峻阳恩慧肖朝乾王智猛艾长发丁海波张建文田钧代伟李俊
Owner CHINA RAILWAYS CORPORATION
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