A kind of preparation method of factory-mixed heat recycled asphalt mixture

A technology of asphalt mixture and thermal regeneration, which is applied in the field of road engineering, can solve the problems of increasing the production mix ratio of recycled mixture, reducing the economic advantages of recycled mixture, and affecting the performance of recycled mixture, so as to improve the recycling rate, Easy to achieve, prevent graying effect

Active Publication Date: 2017-01-11
TONGJI UNIV
View PDF6 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of preparation method of factory-mixed heat recycled asphalt mixture
  • A kind of preparation method of factory-mixed heat recycled asphalt mixture
  • A kind of preparation method of factory-mixed heat 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 sieving test was carried out on the old aggregate obtained from the extraction test, and the test results are shown in Table 1. The old asphalt after the extraction test was recovered by rotary evaporation method, and the performance index test was carried out. The test results are shown in Table 2.

[0030] Table 1 Grading of old aggregates in RAP

[0031]

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

[0033] Penetration 25°C (0.1mm) Softening point (℃) Ductility 15℃(cm) 12.1 74.6 Brittle

[0034] The new aggregate is limestone, and the mineral powder is limestone mineral powder. The relative density of the new aggregate was tested, and the test results...

Embodiment 2

[0058]Indoor test example: The RAP used in the experiment is the same source with different particle sizes, which are counted as RAP1 (0-16mm) and RAP2 (0-25mm) respectively. Firstly, the two kinds of RAP were sampled respectively, and then the samples were subjected to extraction test. The asphalt content of RAP1 was 4.55%, and that of RAP2 was 3.45%. A sieving test was carried out on the old aggregate obtained from the extraction test, and the test results are shown in Tables 6 and 7. The old asphalt after the extraction test was recovered by rotary evaporation method, and the performance index test was carried out. The test results are shown in Table 8.

[0059] Table 6 Grading of old aggregates in RAP1

[0060]

[0061] Table 7 Grading of old aggregates in RAP2

[0062] Particle size (mm) 0 0.075 0.15 0.3 0.6 1.18 2.36 Cumulative pass 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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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 recycled asphalt mixture. Background technique [0002] The production process of factory-mixed hot recycled asphalt mixture is to transport the waste asphalt pavement (RAP) to the asphalt mixing plant (field, station), crush and screen, and then mix it with new aggregate, new asphalt, The hot mix recycled mixture made by mixing the regenerant (if necessary) and so on. Its main function is to repair asphalt pavement surface disease, 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. The utility model has the advantages of easy control of the regeneration process, good performance of the recycled asphalt mixture, and wide application range. However, in the conventional mixing process, the old material and...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C04B26/26
Inventor 刘黎萍邵慧君孙立军
Owner TONGJI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap