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Pavement maintained by adopting cold regeneration technology and construction method thereof

A construction method and cold recycling technology, which can be applied to cohesive pavement, roads, roads and other directions paved on site, can solve the problems of inability to handle waste materials, pollute the environment, and high cost, and achieve disease prevention and small compressive rebound modulus , the effect of prolonging the service life

Active Publication Date: 2009-12-02
天津市市政工程研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This not only has a long construction period and high cost, but also brings a lot of waste that cannot be processed and seriously pollutes the environment.

Method used

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  • Pavement maintained by adopting cold regeneration technology and construction method thereof
  • Pavement maintained by adopting cold regeneration technology and construction method thereof
  • Pavement maintained by adopting cold regeneration technology and construction method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Taking a pavement with a length of 1km and a width of 3.75m and a treatment thickness of 18cm as an example, the steps of the road surface maintenance method using cold recycling technology are as follows:

[0056] (1) On-site milling of the original damaged asphalt pavement to obtain RAP (recycled asphalt pavement).

[0057] (2) Optimize and adjust the gradation of RAP, and prepare foamed asphalt cold recycled mixture by using factory-mixed cold recycling method, specifically: transport RAP back to the cold recycling mixing plant, and use factory-mixed RAP, asphalt, cement, and water Cold recycling equipment for mixing, the weight of each material is:

[0058] RAP 1485t;

[0059] Asphalt 34.2t;

[0060] Cement 22.3t;

[0061] Water 83.2t,

[0062] After stirring evenly, the foamed asphalt cold recycled mixture is obtained.

[0063] The gradation range of foamed asphalt cold recycled mixture prepared according to RAP is:

[0064] mesh size

(mm)

...

Embodiment 2

[0072] Taking the pavement with a length of 1km, a width of 3.75m, and a treatment thickness of 20cm as an example, the steps of the construction method of repairing the pavement with cold recycling technology are as follows:

[0073] (1) On-site milling and planing of the original damaged cement-stabilized base to obtain CTB (recycled cement-stabilized base).

[0074] (2) Optimize and adjust the CTB gradation, and prepare the foamed asphalt cold recycled mixture by using the in-situ cold recycling method. Specifically, the CTB, asphalt, cement, and water are used to regenerate the foamed asphalt on the spot and complete the spreading at the same time. For paving, the cement is sprinkled by cement slurry truck, and the weight of each material is as follows:

[0075] CTB 1575t;

[0076] Asphalt 42.5t;

[0077] Cement 31.5t;

[0078] 151.2t of water,

[0079] The gradation range of foamed asphalt cold recycled mixture prepared according to CTB is:

[0080] mesh siz...

Embodiment 3

[0088] Taking a pavement with a length of 1km, a width of 3.75m, and a treatment thickness of 20cm as an example, the steps of the construction method for repairing the pavement with cold recycling technology are as follows:

[0089] (1) On-site milling of cement-stabilized base to obtain CTB (recycled material of cement-stabilized base).

[0090] (2) Optimizing and adjusting the CTB gradation, adopting the in-situ cold regeneration method to prepare foamed asphalt cold recycled mixture, specifically the same as in Example 2, and the weights of each material are respectively:

[0091] CTB 1307t;

[0092] Asphalt 44.1t;

[0093] Cement 31.5t;

[0094] Fine aggregate 267.8t;

[0095] Water 155.9t;

[0096] The gradation range of foamed asphalt cold recycled mixture prepared according to CTB is:

[0097] Sieve hole

size

(mm)

37.5

31.5

26.5

19

16

13.2

9.5

4.75

...

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Abstract

The invention relates to pavement maintained by adopting cold regeneration technology, which comprises the following innovation that: the pavement from a milled basement to the surface is provided with a foamed asphalt cold regeneration layer, a modified asphalt hot mixed macadam stress absorbing layer and a single-layer modified asphalt concrete overlay in turn. Diseases caused by a semi-rigid base are prevented by changing a pavement structure, and the service life of a road is prolonged. The invention also relates to a construction process for the pavement maintained by adopting the cold regeneration technology, which mainly comprises the following steps: milling on-site pavement, adjusting gradation, preparing a foamed asphalt cold regeneration mixture, paving on-site, rolling, distributing the stress absorbing layer, and paving the single-layer modified asphalt concrete overlay. The pavement and the method adopt the foamed asphalt cold regeneration technology, thereby realizing recycling an asphalt surface course recycling material and a cement stabilized base recycling material, solving the pollution problem caused by a great amount of discarded pavement materials, saving resources, reducing economic investment, and having good economic benefit, social benefit, environmental benefit and promotion and application value.

Description

technical field [0001] The invention belongs to the field of road maintenance and construction, in particular to a road surface maintained by cold regeneration technology and a construction method thereof. Background technique [0002] At present, more than 90% of high-grade highways in my country use semi-rigid materials (cement, lime, fly ash binder stabilized aggregates, etc.) as the asphalt pavement base or subbase during construction. That is to say, the semi-rigid base asphalt pavement has become the main structure type of asphalt pavement in my country's high-grade highways. It is generally believed that the semi-rigid base has the advantages of strong board and high bearing capacity, but once the semi-rigid base is damaged, the consequences are often more serious. Moreover, with the extension of the road service period, a large number of high-grade roads in our country have entered the maintenance period. The traditional maintenance methods are all "opening the bel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C7/32
Inventor 王德群吴景海
Owner 天津市市政工程研究院
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