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Recycled asphalt concrete and preparation process thereof

A technology for reclaiming asphalt and concrete, which is applied in the field of asphalt concrete, which can solve the problems of easy cracks and poor bonding at the splicing joints, and achieve the effects of good compound synergy, improved bonding strength, and good bonding strength

Inactive Publication Date: 2019-07-12
上海宝新特种沥青混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem in the prior art that due to the poor bonding of new and old asphalt concrete after splicing, cracks are likely to occur at the splicing place during use, the first purpose of the present invention is to provide a recycled asphalt concrete, which can be regenerated by adding sintered It is a metal powder porous material, and has a good coordination effect with fiber fillers and reinforcing fillers to solve the above technical problems. It has good bonding strength with the old asphalt concrete during laying, and it is not easy to produce cracks during use.

Method used

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  • Recycled asphalt concrete and preparation process thereof
  • Recycled asphalt concrete and preparation process thereof
  • Recycled asphalt concrete and preparation process thereof

Examples

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Effect test

Embodiment 1

[0046] Embodiment 1: A kind of recycled asphalt concrete, each component and its corresponding parts by weight are shown in Table 1, and prepared by the following steps:

[0047] Step 1: Stir and dry the new aggregate, steel slag, lignin fiber and glass microspheres in the drying barrel with the corresponding weight parts, the temperature is controlled at 100°C, the time is 25min, and the stirring speed is 1200rpm to obtain dried Mixture;

[0048] Step 2, put the dry mixture into the mixing tank, heat 60% by weight of SBS modified asphalt to 170°C, add it into the mixing tank evenly within 30s, and stir at a stirring speed of 900rpm;

[0049] Step 3: Preheat the regenerated asphalt mixed old material to 80°C and add it together with the regeneration agent into the above mixing tank for stirring. The temperature in the mixing tank is maintained at 170°C, the stirring speed is 900rpm, and the time is 30min. Then add the remaining 40% by weight of SBS modified asphalt and sinter...

Embodiment 2-8

[0052] Example 2-8: A recycled asphalt concrete, the difference from Example 1 is that each component and its corresponding parts by weight are shown in Table 1.

[0053] Each component and parts by weight thereof in table 1 embodiment 1-8

[0054]

[0055]

Embodiment 9

[0056] Example 9: A recycled asphalt concrete, the difference from Example 1 is that the new aggregate is mainly composed of limestone with a particle size range of 0-3mm, 3-5mm, 5-13mm, 13-20mm, and 20-25mm The ratio of parts by weight is 1.5:2.3:7.4:1:3.2.

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Abstract

The invention discloses recycled asphalt concrete and a preparation process thereof, relates to the technical field of asphalt concrete and solves the problem that joint positions of asphalt concreteprone to cracking during use due to the fact that new and old asphalt concrete is poorer in bondability after jointing. The recycled asphalt concrete is prepared from components in parts by weight asfollows: 72-80 parts of new aggregate, 4-6 parts of SBS modified asphalt, 0.2-0.4 parts of mineral powder, 20-24 parts of an old recycled asphalt mixture, 0.12-0.16 parts of a recycling agent, 6-8 parts of steel slag, 2.4-4.6 parts of a sintered metal powder porous material, 0.08-0.14 parts of an asphalt defoaming agent CI-1814, 4-8 parts of fiber filler and 3-7 parts of reinforcing filler. The recycled asphalt concrete has good bonding strength with old asphalt concrete when applied to road construction and is not prone to cracking during use, so that whole roads have long service life.

Description

technical field [0001] The invention relates to the technical field of asphalt concrete, more specifically, it relates to a recycled asphalt concrete and a preparation process thereof. Background technique [0002] Asphalt concrete, commonly known as asphalt concrete, is artificially selected with a certain gradation composition of mineral materials, crushed stone or crushed gravel, stone chips or sand, mineral powder, etc., and a certain proportion of road asphalt materials, mixed under strictly controlled conditions made mixture. [0003] A Chinese invention patent with the publication number CN109095828A discloses a kind of asphalt concrete and its production process. The asphalt concrete is made of raw materials comprising the following weights: modified asphalt 13-25wt%, cement 6-15wt%, aggregate 46- 63wt%, filler 16-33wt%, and auxiliary agent 1-5wt%; its preparation method is: weigh the raw materials of each component according to the set ratio, heat the weighed modif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/26
CPCC04B26/26C04B2111/0075C04B2201/50C04B14/02C04B18/16C04B18/142C04B14/34C04B2103/50C04B14/28C04B18/24C04B14/22C04B24/045C04B24/2641C04B24/34C04B14/383
Inventor 胡俊伟
Owner 上海宝新特种沥青混凝土有限公司
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