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Preparation method of high-volume plant-mixed hot recycled asphalt mixture

A technology for asphalt mixture and thermal regeneration, applied in the field of highway construction materials, can solve the problems of ineffective application, large impact on the quality of old RAP materials, and large variability, achieve significant social and economic benefits, improve traffic capacity, The effect of removing variability

Active Publication Date: 2022-04-01
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the scheme of this application has increased the amount of RAP material in the asphalt mixture compared with the prior art, but due to the different grades of the components of the RAP material in the early stage, its variability is relatively large. The asphalt prepared by using the scheme of this application The performance of the mixture is greatly affected by the quality of recycled RAP old materials, which cannot be effectively used in actual production and construction

Method used

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

Examples

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Comparison scheme
Effect test

Embodiment 1

[0044] The preparation method of the high-volume plant-mixed hot recycled asphalt mixture of this embodiment, such as figure 1 As shown, the specific steps are as follows:

[0045]Step 1. Classification and grading of RAP materials. Classify RAP materials according to the source of RAP materials, storage conditions and testing conditions, and then classify various RAP materials according to the mud content below 0.075mm, asphalt content and asphalt penetration. class.

[0046] The basis for the classification and grading of RAP materials is shown in Table 1.

[0047] Table 1. RAP material classification and grading basis table

[0048]

[0049]

[0050] For the classification of RAP materials, you can ask the supplier or check the relevant records when purchasing RAP materials.

[0051] Step 2: Determine the dosage. According to the classification and grading results of RAP materials, different types and grades of RAP materials adopt different blending ratios.

[005...

Embodiment 2

[0090] This example shows the preparation method of AC-13C recycled asphalt mixture.

[0091] The AC-13C type recycled asphalt mixture of this embodiment includes the following components by weight: 55 parts by weight of Class II first-class recycled asphalt pavement reclaimed material; 40 parts by weight of crushed stone; 2.4 parts by weight of mineral powder; high glue and high viscosity 2.6 parts by weight of asphalt.

[0092] 1. Classify and grade the obtained old asphalt recycled material according to the regulations, and finally determine it as the second-class first-class RAP material, and then screen out the part of the RAP material below 0.3mm to determine the dosage of the RAP material.

[0093] 2. Mix the above-mentioned RAP materials mechanically and carry out crushing treatment, then carry out screening treatment, and sieve into 30% of the first coarse aggregate with a particle size of 0-10mm and 70% of the second coarse aggregate with a particle size of 10-15mm. ...

Embodiment 3

[0106] This example shows the preparation method of AC-20C recycled asphalt mixture.

[0107] The AC-20C type recycled asphalt mixture of this embodiment includes the following components by weight: 65 parts by weight of Class II primary recycled asphalt pavement reclaimed material; 32 parts by weight of crushed stone; 0.5 part by weight of mineral powder; high glue and high viscosity 2.4 parts by weight of asphalt.

[0108] 1. Classify and grade the obtained old asphalt recycled material according to the regulations, and finally determine it as the second-class first-class RAP material, and then screen out the part of the RAP material below 0.3mm to determine the dosage of the RAP material.

[0109] 2. Mix the above-mentioned RAP materials mechanically and carry out crushing treatment, then carry out screening treatment, and sieve into 30% of the first coarse aggregate with a particle size of 0-10mm and 70% of the second coarse aggregate with a particle size of 10-15mm. Coar...

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Abstract

The invention discloses a method for preparing a high-volume plant-mixed hot recycled asphalt mixture, which belongs to the technical field of road construction materials. It includes the following steps: 1. Classification and grading of RAP materials; 2. Determination of the dosage. According to the classification and grading results of RAP materials, different blending ratios are used for different types and grades of RAP materials; 3. Crushing and screening, the RAP materials are Crushing treatment, screening after crushing; 4. Determine the synthetic gradation; 5. Determine the amount of asphalt, choose high-viscosity and high-glue modified asphalt, use the Marshall test method to determine the optimal amount of asphalt, and add 0.3% on this basis Asphalt dosage is the final asphalt dosage; 6. Prepare high-volume plant-mixed hot recycled asphalt mixture. The invention greatly increases the amount of RAP material, has significant social and economic benefits, saves investment and reduces construction costs, improves road traffic capacity and reduces transportation costs under the premise of ensuring project quality.

Description

technical field [0001] The invention belongs to the technical field of road construction materials, and more specifically relates to a method for preparing a high-volume plant-mixed hot recycled asphalt mixture. Background technique [0002] At present, the blending ratio of RAP materials is mostly 10%-25%, but this blending ratio cannot consume all RAP materials, resulting in excessive accumulation and waste of RAP materials, which brings a lot of economic and environmental problems. Therefore, the excessive use of RAP materials High proportion recovery (dosage greater than 40%) has attracted more and more attention, but at the same time, research on high-dosage plant-mixed thermal regeneration is in its infancy, and a large amount of RAP high-dosage is only limited to theory and ignores the RAP material itself The variability and quality control of the vehicle have also ignored the problem of how to ensure its long-term road performance when applied to the expressway. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B26/26
CPCC04B26/26C04B2111/0075C04B2201/50C04B2201/20C04B18/16C04B18/141C04B14/14C04B14/28
Inventor 顾兴宇王晨
Owner SOUTHEAST UNIV
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