Recycled asphalt concrete and preparation method thereof

A technology for recycling asphalt and concrete, applied in the field of resource utilization of construction waste, can solve the problems of cracking temperature, poor viscoelastic performance, and inability to use advanced pavement, and achieve the effect of good air purification and performance optimization

Active Publication Date: 2019-04-12
湖南莲城机械化工程有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention regenerates the asphalt milling material by adding a certain proportion of regenerant, which improves the material performance of the recycled mixture and improves the utilization rate of the waste asphalt mixture. However, the present invention belongs to cold-mix asphalt mixture and is only suitable It is used for the surface layer of branch roads and the roads below them, and the surface layer of branch roads. It cannot be used for high-level road surfaces such as expressways and trunk roads.
[0006] At present, the content of waste asphalt mixture RAP in the plant-mixed heat recycling technology is generally not higher than 30%, and it is rarely used in the surface layer of expressways. The main reason is that the waste and old asphalt mixture RAP asphalt is aging, hard and brittle, The deterioration of viscoelastic properties makes hot recycled asphalt mixture prone to cracking (temperature cracking and fatigue cracking), and the higher the old material content, the more serious the cracking problem

Method used

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  • Recycled asphalt concrete and preparation method thereof
  • Recycled asphalt concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A high-performance recycled asphalt concrete, comprising the following components by weight: 38 parts of coarse aggregate, 45 parts of old asphalt mixture, 3 parts of iron ore powder, 1.2 parts of SBS modified asphalt and 2 parts of regeneration agent;

[0044] in,

[0045] The particle diameter of described coarse aggregate is 26.5mm, and crushing value is 18%, and water absorption rate is 1.5%;

[0046] In the old asphalt mixture mentioned above,

[0047] Old asphalt mixture with a particle size of 13.2-19mm accounted for 28%;

[0048] Old asphalt mixture with a particle size of 4.75-9.5mm accounts for 15%;

[0049] The old asphalt mixture with a particle size of 0.6-2.36mm accounts for 30%,

[0050] The balance is old asphalt mixture with particle size less than 0.15mm;

[0051] The particle diameter of described iron ore powder is 0.075mm;

[0052] In the regenerant, the particle size of the modified diatomite is 100nm, and the mass ratio of the waste engine oi...

Embodiment 2

[0058] A high-performance recycled asphalt concrete, comprising the following components by weight: 42 parts of coarse aggregate, 55 parts of old asphalt mixture, 5 parts of iron ore powder, 2.5 parts of SBS modified asphalt and 3.5 parts of regeneration agent;

[0059] in,

[0060] The particle diameter of described coarse aggregate is 31.5mm, and crushing value is 25%, and water absorption rate is 2%;

[0061] In the old asphalt mixture mentioned above,

[0062] Old asphalt mixture with a particle size of 13.2-19mm accounted for 36%;

[0063] Old asphalt mixture with a particle size of 4.75-9.5mm accounted for 22%;

[0064] The old asphalt mixture with a particle size of 0.6-2.36mm accounts for 40%,

[0065] The balance is old asphalt mixture with particle size less than 0.15mm;

[0066] The particle diameter of described iron ore powder is 0.15mm;

[0067] In the regenerant, the particle size of the modified diatomite is 500nm, and the mass ratio of the waste engine oil,...

Embodiment 3

[0073] A high-performance recycled asphalt concrete, comprising the following components by weight: 39 parts of coarse aggregate, 46 parts of old asphalt mixture, 3.1 parts of iron ore powder, 1.3 parts of SBS modified asphalt and 2.1 parts of regeneration agent;

[0074] in,

[0075] The particle diameter of described coarse aggregate is 31.5mm, and crushing value is 18%, and water absorption rate is 1.5%;

[0076] In the old asphalt mixture mentioned above,

[0077] Old asphalt mixture with a particle size of 13.2-19mm accounted for 36%;

[0078] Old asphalt mixture with a particle size of 4.75-9.5mm accounted for 22%;

[0079] The old asphalt mixture with a particle size of 0.6-2.36mm accounts for 40%,

[0080] The balance is old asphalt mixture with particle size less than 0.15mm;

[0081] The particle diameter of described iron ore powder is 0.075mm;

[0082] In the regenerant, the particle size of the modified diatomite is 150nm, and the mass ratio of the waste engi...

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Abstract

The invention discloses recycled asphalt concrete. The recycled asphalt concrete comprises the following components in parts by weight: 38-42 parts of coarse aggregates, 45-55 parts of an old asphaltmixture, 3-5 parts of iron ore powder, 1.2-2.5 parts of asphalt and 2-3.5 parts of a regenerating agent. The invention further provides a preparation method of the recycled asphalt concrete. The preparation method comprises the following steps: (1) preparing a recycling agent; (2) preparing a recycled asphalt mixture; and (3) sequentially adding the coarse aggregates and the iron ore powder into the recycled asphalt mixture prepared in the step (2), and carrying out heating and stirring to obtain the recycled asphalt concrete. According to the recycled asphalt concrete provided by the invention, the problem that a regenerated asphalt mixture cracks easily is effectively solved while the utilization rate of the highly old asphalt mixture is considered, so that the recycled asphalt concreteprovided by the invention can be applied to paving high-grade pavements such as fast roads, main trunk roads and the like.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of construction waste, and in particular relates to a high-performance recycled asphalt concrete and a preparation method thereof. Background technique [0002] Regeneration of asphalt pavement materials is to re-mix the refurbished or waste old asphalt concrete pavement, after digging, recycling, crushing, screening, adding appropriate new aggregate and new asphalt, and remixing it into a recycled asphalt mixture with good road performance. material. [0003] In view of the fact that some diseases will affect the service level of the asphalt pavement after a certain period of service, it is re-paved every 12 years (the actual service life is lower than the design life), and the annual production of waste asphalt mixture (RAP) exceeds 20 million tons. Waste asphalt mixture is mainly composed of asphalt binder and aggregate. At present, a huge amount of waste asphalt mixture cannot be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/26C04B18/16
CPCC04B26/26C04B2111/00017C04B2111/0075C04B18/16C04B14/02C04B24/00C04B24/001C04B22/06C04B14/00Y02W30/91
Inventor 潘青莲陈立新谢曙光雷斌松李岱颖
Owner 湖南莲城机械化工程有限责任公司
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