Anti-cracking asphalt mixture and processing method thereof

A technology of asphalt mixture and processing method, which is applied in the field of road construction materials, can solve problems such as limited improvement effects, and achieve the effects of reducing temperature sensitivity, improving fatigue resistance, and increasing softening point

Pending Publication Date: 2022-06-03
CHINA ROAD & BRIDGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current improvement of temperature cracks in asphalt mixtures includes the use of rubber powder to modify asphalt, but the improvement effect is limited. How to further increase the softening point of asphalt and reduce the temperature sensitivity of asphalt is an urgent problem to be solved at present

Method used

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  • Anti-cracking asphalt mixture and processing method thereof
  • Anti-cracking asphalt mixture and processing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Anti-cracking asphalt mixture, calculated by weight components, includes: 100 parts of mineral aggregates, 5 parts of heavy traffic AH-90 asphalt, 0.72 parts of desulfurized rubber powder, and 0.3 parts of lanthanum oxide. Among them, the mass ratio of mineral aggregates is 90:11 Aggregate and slag powder, slag powder is obtained by grinding limestone, particle size ≤ 0.075mm;

[0043] A processing method for anti-cracking asphalt mixture, comprising the following steps:

[0044] S1. Store the base asphalt in the base asphalt storage tank, open the base asphalt storage tank for heating, and preheat the base asphalt to 150±5°C;

[0045] S2. Transfer the preheated base asphalt to the pre-mixed irrigation, continue heating to 180±5°C, add rubber powder and stir to disperse evenly during the continuous heating process, keep it warm for 25 minutes, add rare earth oxides, and then mix and shear , the shear time and shear rate were 23min and 4500r / min respectively, and then d...

Embodiment 2

[0049] Anti-cracking asphalt mixture, calculated by weight components, includes: 100 parts of mineral materials, 5 parts of heavy traffic AH-90 asphalt, 0.72 parts of desulfurized rubber powder, 0.3 parts of lanthanum oxide, and 0.09 parts of lignin fiber. Among them, the mineral materials include Aggregate and mineral powder with a mass ratio of 90:11. The mineral powder is obtained by grinding limestone, with a particle size of ≤0.075mm;

[0050] A processing method for anti-cracking asphalt mixture, comprising the following steps:

[0051] S1. Store the base asphalt in the base asphalt storage tank, open the base asphalt storage tank for heating, and preheat the base asphalt to 150±5°C;

[0052] S2. Transfer the preheated base asphalt to the pre-mixed irrigation, continue to heat to 180±5°C, add rubber powder and stir to disperse evenly during the continuous heating process, keep it warm for 25 minutes, add rare earth oxides and then mix and shear , the shear time and shea...

Embodiment 3

[0056] Anti-cracking asphalt mixture, by weight components, including: 100 parts of mineral aggregate, 5 parts of heavy traffic AH-90 asphalt, 0.72 parts of desulfurized rubber powder, 0.3 parts of lanthanum oxide, 0.09 parts of lignin fiber, 0.05 parts of polypropylene, Among them, the mineral material includes aggregate and mineral powder with a mass ratio of 90:11, and the mineral powder is obtained by grinding limestone, with a particle size of ≤0.075mm;

[0057]A processing method for anti-cracking asphalt mixture, comprising the following steps:

[0058] S1. Store the base asphalt in the base asphalt storage tank, open the base asphalt storage tank for heating, and preheat the base asphalt to 150±5°C;

[0059] S2. Transfer the preheated base asphalt to the pre-mixed irrigation, continue heating to 180±5°C, add rubber powder and stir to disperse evenly during the continuous heating process, keep it warm for 25 minutes, add rare earth oxides, and then mix and shear , the ...

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Abstract

The invention discloses an anti-cracking asphalt mixture which comprises the following components in parts by weight: 100 parts of mineral aggregate, 4.8-5.3 parts of matrix asphalt, 0.70-0.75 part of desulfurized rubber powder and 0.3 part of rare earth oxide, the mineral aggregate comprises aggregate and mineral powder in a mass ratio of (90-93): 11; and the matrix asphalt is heavy traffic AH-90 asphalt or heavy traffic AH-70 asphalt. A processing method of an anti-cracking asphalt mixture comprises the following steps: heating matrix asphalt to 170-180 DEG C, adding rubber powder, stirring to uniformly disperse the rubber powder, adding rare earth oxide, mixing and shearing, and developing to obtain modified asphalt; and heating the mixing pot to the mixing temperature of 170-180 DEG C, and sequentially mixing the preheated aggregate, the modified asphalt subjected to heat preservation for later use and the preheated mineral powder to prepare the asphalt mixture. The method has the beneficial effects that the temperature sensitivity of asphalt is reduced, and the cracking resistance of the asphalt mixture is improved.

Description

technical field [0001] The invention relates to the technical field of road construction materials. More specifically, the present invention relates to a crack-resistant asphalt mixture and its processing method. Background technique [0002] Asphalt pavement cracking is one of the phenomena of asphalt pavement damage in various countries, and it is a main form of early damage to asphalt pavement. The main causes of asphalt pavement cracking are new load cracks, semi-rigid base reflection cracks, and temperature cracks formed under the repeated action of traffic loads. Among them, temperature cracks include temperature shrinkage cracks and temperature fatigue cracks. Temperature shrinkage cracks are when the temperature When falling, the asphalt mixture will gradually harden and become brittle, and shrinkage deformation will occur. When the shrinkage tensile stress exceeds the tensile strength of asphalt concrete, the surface of the asphalt pavement will be cracked, forming...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C04B26/26
CPCC04B26/26C04B2111/0075C04B2201/50C04B18/22C04B18/12C04B14/28C04B22/06C04B18/26C04B24/2611Y02W30/62
Inventor尚鑫贾其军
OwnerCHINA ROAD & BRIDGE