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Asphalt regenerant consumption determining method based on rheological performance balance design

A technology of asphalt regeneration agent and rheological properties, applied in the direction of material inspection products, etc., can solve the problems of consumables and time-consuming, and achieve the effect of fast and accurate dosage determination, less asphalt dosage, and reduced stiffness

Inactive Publication Date: 2019-01-04
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the analysis found that for the determination of the amount of regenerant used in the regeneration of aged asphalt, although the method of penetration recovery rate is simple to operate, it mainly depends on experience and is relatively macroscopic. It is not consistent, and it is time-consuming and consumable to determine the amount of regenerant directly through the performance test of the mixture.

Method used

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  • Asphalt regenerant consumption determining method based on rheological performance balance design
  • Asphalt regenerant consumption determining method based on rheological performance balance design
  • Asphalt regenerant consumption determining method based on rheological performance balance design

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The method for determining the amount of regenerant based on rheological performance balance design in this embodiment and the verification steps for road performance of the mixture are as follows:

[0044] (1) Select A regenerant to blend with the old asphalt in RAP according to the dosage of 3%, 6%, and 9%, respectively, stir evenly at 130°C for 30 minutes, and keep it at this temperature for 2 hours, so that the regenerant and aging The asphalt is fully fused to prepare recycled asphalt;

[0045] (2) Carry out temperature scanning, MSCR, LAS and 4mm-DSR low-temperature frequency scanning tests on recycled asphalt, and test the composite shear modulus G of recycled asphalt samples * , high temperature non-recoverable creep compliance J nr-3.2 、Medium temperature fatigue failure life N f , low temperature relaxation modulus G r(60s) and relaxation rate |m r (60s)|Indicators, the results are shown in Table 3;

[0046] Table 3 Test results of A regenerant asphalt te...

Embodiment 2

[0051] The method for determining the amount of regenerant based on rheological performance balance design in this embodiment and the verification steps for road performance of the mixture are as follows:

[0052] (1) Select B regenerant to blend with the old asphalt in RAP according to the dosage of 3%, 6% and 9%, respectively, stir evenly at 130°C for 30min, and keep warm at this temperature for 2h, so that the regenerant and aging The asphalt is fully fused to prepare recycled asphalt;

[0053] (2) Carry out temperature scanning, MSCR, LAS and 4mm-DSR low-temperature frequency scanning tests on recycled asphalt, and test the composite shear modulus G of recycled asphalt samples * , high temperature non-recoverable creep compliance J nr-3.2 、Medium temperature fatigue failure life N f , low temperature relaxation modulus G r (60s) and relaxation rate |m r (60s)|Indicators, the results are shown in Table 4;

[0054] Table 4 Test results of B regenerant asphalt technical ...

Embodiment 3

[0059] The method for determining the amount of regenerant based on rheological performance balance design in this embodiment and the verification steps for road performance of the mixture are as follows:

[0060] (1) Select C regenerant to blend with the old asphalt in RAP according to the doses of 3%, 6%, and 9%, respectively, stir evenly at 130°C for 30 minutes, and keep warm at this temperature for 2 hours to make the regenerant and aging The asphalt is fully fused to prepare recycled asphalt;

[0061] (2) Carry out temperature scanning, MSCR, LAS and 4mm-DSR low-temperature frequency scanning tests on recycled asphalt, and test the composite shear modulus G of recycled asphalt samples * , high temperature non-recoverable creep compliance J nr-3.2 、Medium temperature fatigue failure life N f , low temperature relaxation modulus G r (60s) and relaxation rate |m r (60s)|Indicators, the results are shown in Table 5;

[0062] Table 5 Test results of C regenerant asphalt t...

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Abstract

The invention discloses an asphalt regenerant consumption determining method based on rheological performance balance design. The method includes steps: 1), recycling used asphalt from a milling and planing material RAP; 2), preparing regenerated asphalt samples for different regenerant consumptions; 3), testing composite shear modulus G*, high-temperature unrecoverable creep compliance Jnr-3.2, fatigue failure life Nf, low-temperature relaxation modulus G (t) and relaxation rate mr (t); 4), determining optimal regenerant consumption and type. Through the above mode, optimal regenerant consumption and type can be determined during used asphalt regeneration by starting from rheological performance reflecting regenerated asphalt material nature to enable pavement performance of a regeneratedasphalt mixture to meet requirements.

Description

technical field [0001] The invention belongs to the technical field of road engineering materials, in particular to a method for determining the amount of asphalt regenerant based on rheological property balance design. Background technique [0002] The asphalt pavement is repeatedly affected by moisture, temperature and load during the long-term service process, which will cause the asphalt in the pavement to age and the aggregate to break, which will lead to rutting, cracks, wrapping and other diseases on the asphalt pavement, and the service performance will decline. Asphalt pavement thermal regeneration technology can not only recycle the milling material RAP produced by pavement maintenance and repair, effectively deal with pavement diseases, alleviate resource conflicts, but also has a wide range of application layers, with prominent economic benefits and environmental protection effects. [0003] In the process of asphalt pavement regeneration, it is necessary to add ...

Claims

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Application Information

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IPC IPC(8): G01N33/42
CPCG01N33/42
Inventor 韩森张亚财高巍程贤鹏李杨
Owner CHANGAN UNIV
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