Preparation method of plant-mixed hot recycled asphalt mixture

An asphalt mixture and thermal regeneration technology, applied in the field of road engineering, can solve the problems of increasing the difference in the production mix ratio of the recycled mixture, reducing the economic advantage of the recycled mixture, affecting the performance of the recycled mixture, etc. Easy to achieve and prevent whitening effect

Active Publication Date: 2015-08-19
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This mixing process does not take into account the difference between the new aggregate and the old material (with asphalt coating), resulting in the difference between the new aggregate and the old material in the recycled mixture after mixing. The uniformity is poor, and the new aggregate with large particle size is often not fully coated with asphalt after mixing, showing the phenomenon of graying material
In order to control the occurrence of graying material, sometimes the addition of new asphalt has to be increased, which not only increases the difference between the production mix ratio of the recycled mixture and the design mix ratio, but also affects the performance of the recycled mixture; at the same time, it causes a waste of asphalt resources, Reduced economic advantage of recycled mixes

Method used

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  • Preparation method of plant-mixed hot recycled asphalt mixture
  • Preparation method of plant-mixed hot recycled asphalt mixture
  • Preparation method of plant-mixed hot recycled asphalt mixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Indoor test example: The RAP used in the experiment is the material of the same source and the same particle size. First, the RAP is sampled, and then the sample is subjected to an extraction test. The test shows that the asphalt content of the RAP is 4.55%. A screening test was performed on the old aggregate obtained in the extraction test. The test results are shown in Table 1. Rotary evaporation method is used to recover the old asphalt after extraction test, and perform performance index test. The test results are shown in Table 2.

[0030] Table 1 Gradation of old aggregates in RAP

[0031]

[0032] Table 2 Test results of old asphalt performance indexes in RAP

[0033] Penetration degree 25℃(0.1mm)

Softening point (℃)

Ductility 15℃(cm)

12.1

74.6

Brittle

[0034] The new aggregate is limestone, and the ore powder is limestone ore powder. The relative density of the new aggregate was tested, and the test results are shown in Table 3.

[0035] Table 3 Test results...

Embodiment 2

[0058] Indoor test example: The RAP used in the experiment is a material of the same source with different particle sizes, and is counted as RAP1 (0-16mm) and RAP2 (0-25mm) respectively. First sample two kinds of RAP respectively, and then carry out extraction test on the sample. The test shows that the asphalt content of RAP1 is 4.55% and the asphalt content of RAP2 is 3.45%. A screening test was performed on the old aggregate obtained in the extraction test. The test results are shown in Tables 6 and 7. Rotary evaporation method is used to recover the old asphalt after extraction test, and perform performance index test. The test results are shown in Table 8.

[0059] Table 6 Gradation of old aggregates in RAP1

[0060]

[0061] Table 7 Gradation of old aggregates in RAP2

[0062] Particle size (mm)

0

0.075

0.15

0.3

0.6

1.18

2.36

Cumulative passing percentage (%)

0.0

9.0

10.2

11.8

14.2

17.6

24.1

Particle size (mm)

4.75

9.5

13.2

16

19

26.5

31.5

Cumulative passing percent...

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PUM

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Abstract

The invention discloses a preparation method of a plant-mixed hot recycled asphalt mixture. The preparation method comprises the following steps: (1) after heating new aggregates, adding the new aggregates into a mixing cylinder; (2) after heating part of new asphalt, adding the heated new asphalt into the mixing cylinder for the product obtained in the step (1) for mixing; (3) after heating RAP (recycled asphalt pavement) materials, adding the RAP materials into the mixing cylinder for the product obtained in the step (2); (4) adding the rest of new asphalt into the mixing cylinder with the product obtained in the step (3) for mixing; (5) adding mineral powder into the mixing cylinder for the product obtained in the step (4) for mixing; and (6) taking the mixture obtained in the step (5) out of the cylinder and carrying out forming. The method disclosed by the invention has the advantages of easy implementation, high recycling efficiency of old materials, small use quantity of the new asphalt, effective prevention from generating grizzled materials in the recycled mixture, higher uniformity of the recycled mixture and better performance.

Description

Technical field [0001] The invention belongs to the technical field of road engineering and relates to a method for preparing a plant-mixed hot regenerated asphalt mixture. Background technique [0002] The production process of plant-mixed hot recycled asphalt mixture is to transport waste asphalt pavement materials (RAP) to asphalt mixing plants (sites, stations), crush and screen them, and then mix them with new aggregates, new asphalt, and asphalt in a certain proportion. A hot-mix regenerated mixture made of regenerant (if necessary). Its main function is to repair asphalt pavement surface layer diseases, restore or even improve the road performance of asphalt pavement mixture, and realize the recycling of old pavement asphalt layer materials in the form of hot mix asphalt mixture. It has the advantages of easy control of the regeneration process, better performance of the regenerated asphalt mixture, and wide application range. However, in the conventional mixing process,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/26
Inventor 刘黎萍邵慧君孙立军
Owner TONGJI UNIV
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