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Mixing method of hot mix plant recycled asphalt mixture

A technology of asphalt mixture and old asphalt mixture, which is applied in the field of asphalt concrete, can solve the problems of road surface use function decline, structural disease, land occupation, etc., to reduce voids, improve compressive performance, and improve strength and stability Effect

Active Publication Date: 2021-09-24
SHENZHEN YUETONG CONSTR ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Asphalt pavement will have structural damage after a period of use, resulting in a decline in the use of the pavement. Therefore, general asphalt pavement will face large and medium repair projects after a period of operation. Generally, roads with serious structural diseases often use milling in large and medium repair projects. The treatment method of overlaying, and milling the original road surface will produce a large amount of old asphalt mixture. Most of these materials are discarded and piled up, occupying land and polluting the environment. Therefore, it is necessary to recycle the old asphalt mixture

Method used

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  • Mixing method of hot mix plant recycled asphalt mixture
  • Mixing method of hot mix plant recycled asphalt mixture
  • Mixing method of hot mix plant recycled asphalt mixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A method for mixing hot recycled asphalt mixture in factory, comprising the following steps:

[0048] A1: Mix 5 parts by weight of asphalt with an asphalt ratio of 4% and 1.1 parts of tire reclaimed rubber powder with an average mesh size of 100 mesh, and stir at 170°C for 8 minutes to obtain mixture A;

[0049] A2: Add mixture A to 45 parts of old asphalt mixture, and stir at 155°C for 6 minutes to obtain mixture B;

[0050] A3: Preheat 56 parts of limestone aggregate to 175°C, and add 5 parts of limestone powder with an average mesh size of 180 mesh into mixture B, and stir at 170°C for 33 seconds to obtain recycled asphalt mixture.

Embodiment 2

[0052] A method for mixing hot recycled asphalt mixture in factory, comprising the following steps:

[0053] A1: Mix 5 parts by weight of asphalt and 1.1 parts of modified rubber powder with an average mesh size of 100 mesh, and stir at 170°C for 8 minutes to obtain mixture A;

[0054] A2: Add mixture A to 45 parts of old asphalt mixture with asphalt ratio of 4%, and stir at 155°C for 6 minutes to obtain mixture B;

[0055] A3: Preheat 56 parts of limestone aggregates to 175°C, and add them to mixture B together with 5 parts of limestone powder with an average mesh size of 180 mesh, and stir at 170°C for 33 seconds to obtain recycled asphalt mixture.

[0056] Wherein, the preparation steps of modified rubber powder are as follows:

[0057] B1: 35 parts by weight of tire reclaimed rubber, 10 parts of talc powder with an average mesh size of 1700 mesh, and 3 parts of glycerin were mixed at 120° C. for 11 minutes, and then pulverized to obtain a mixture C;

[0058] B2: Mix 22 p...

Embodiment 3

[0061] The difference from Example 2 is that the preparation steps of the modified rubber powder are as follows:

[0062] B1: 35 parts by weight of tire reclaimed rubber, 1.2 parts of lignin, and 3 parts of glycerin were kneaded at 120°C for 11 minutes, and then crushed to obtain mixture C;

[0063] B2: Mix 22 parts of 11wt% sodium hypochlorite solution with 60 parts of water, and add 8 parts of polyethylene glycol with a relative molecular weight of 5000, stir evenly to obtain mixed solution D;

[0064] B3: Add mixture C to mixture D, stir ultrasonically at 34°C for 9 hours, then filter, wash the solid phase with deionized water, dry it, and loosen it to obtain modified rubber powder.

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Abstract

The invention relates to the technical field of asphalt concrete, in particular to a mixing method of a hot mix plant recycled asphalt mixture. The method comprises the following steps: uniformly mixing 3-5 parts by weight of asphalt and 0.9-1.3 parts by weight of a regenerant to obtain a mixture A; adding the mixture A into 40-50 parts of an old asphalt mixture, and uniformly stirring to obtain a mixture B; and adding 50-56 parts of aggregate and 3-5 parts of mineral powder into the mixture B, and uniformly stirring to obtain the recycled asphalt mixture. The regenerant comprises 30-40 parts of tire reclaimed rubber; 1-1.2 parts of lignin; 8-10 parts of talcum powder; 2-4 parts of glycerol; 6-8 parts of polyethylene glycol; and 20-24 parts of a 10-12wt% sodium hypochlorite solution. The method has the advantage of recycling the waste asphalt mixture.

Description

technical field [0001] The present application relates to the technical field of asphalt concrete, in particular to a method for mixing hot recycled asphalt mixture in factory. Background technique [0002] Asphalt pavement is various types of pavement formed by paving and rolling asphalt concrete. Asphalt concrete is a mixture of asphalt and a certain grade of mineral aggregates, which are fully mixed. [0003] Asphalt pavement will have structural damage after a period of use, resulting in a decline in the function of the pavement. Therefore, after a period of operation, the general asphalt pavement will face large and medium repair projects. Generally, roads with serious structural diseases are often milled in large and medium repair projects. However, milling the original road surface will produce a large amount of old asphalt mixture. Most of these materials are discarded and piled up, occupying land and polluting the environment. Therefore, it is necessary to recycle ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/26C04B24/32
CPCC04B26/26C04B40/0039C04B2111/00017C04B14/02C04B14/28C04B24/18C04B24/026C04B24/32C04B22/124C04B22/08
Inventor 何云武刘涛郑志刚洪绍友王涛韦含辛
Owner SHENZHEN YUETONG CONSTR ENG CO LTD
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