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Asphalt macadam stress absorption layer and construction method thereof

A stress-absorbing layer, asphalt crushed stone technology, applied to roads, on-site coagulation pavement, roads, etc., can solve problems such as pavement cracking, affecting the performance and service life of pavement structures, and pavement damage, and achieve extended use. Longevity, ease of mechanization, and improved performance

Inactive Publication Date: 2008-03-26
徐培华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the asphalt layer is laid on the cement concrete pavement, stress concentration occurs in the asphalt overlay layer above the joint due to the displacement of the cement concrete slab near the joint, and the rigid material of the cement concrete slab itself is highly sensitive to temperature and humidity changes. , when it shrinks or expands, it drives the asphalt overlay layer to shrink and deform accordingly. This interlayer stress is reflected to the asphalt pavement layer and causes the pavement to crack. Under the repeated action of vehicle load and temperature, water enters the crack and aggravates the road surface damage, seriously affecting the performance and service life of the pavement structure

Method used

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  • Asphalt macadam stress absorption layer and construction method thereof

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0024] The construction steps of this embodiment will be described below in conjunction with FIG. 1 .

[0025] (1) The semi-rigid base layer 1 is lime pulverized coal stabilized crushed stone. Before or after three days of health preservation after the semi-rigid base layer is rolled, use a cleaning machine (car) to roughen the surface of the base layer and blow off the floating ash in time, so that the surface aggregate particles are partially exposed, and there is still a "mirror" phenomenon on the surface of the base layer Use a small milling machine for local milling, roughening and cleaning;

[0026] (2) Use a fully automatic asphalt distributor to spread the connecting layer (permeable layer) material 2: kerosene diluted asphalt (asphalt: kerosene = 60:40), the amount of spraying is 0.5 ~ 0.8kg / m 2 , the spraying temperature is not higher than 70°C;

[0027] (3) When the surface of the permeable layer is slightly dry, use a fully automatic asphalt sprinkler to spread S...

Embodiment 2

[0032] The construction steps are basically the same as those in Example 1, the difference is that a synchronous gravel sealing vehicle is used to spread stress-absorbing bonding material and gravel at the same time, and the time interval is 3 to 6 seconds; the semi-rigid base is cement-stabilized gravel ; The material of the permeable layer is high-permeability emulsified asphalt, and the spraying amount is 0.4-0.8kg / m 2 , the spraying temperature is 150-170°C; the stress-absorbing binder is high-viscosity emulsified asphalt, and the spraying amount is 0.4-1.0kg / m 2 , spraying temperature 160 ~ 180 ℃;

Embodiment 3

[0034] The base layer of composite pavement is cement concrete pavement.

[0035] (1) Use a milling machine to mill and roughen the concrete pavement, so that the concrete pavement forms a rough, concave-convex surface texture structure, and clean and blow off the floating dust on the surface;

[0036] (2) Smear or sprinkle the connecting layer (interface sticky layer) material: concrete interface binder;

[0037] (3) Use fully automatic asphalt distributors to spread stress-absorbing binders: SBS heat-modified asphalt, and the amount of spraying is 0.8-2.0kg / m 2 , spraying temperature 170 ~ 180 ℃;

[0038] (4) A fully automatic gravel sealing vehicle is used to spread gravel, the size of the gravel is 10-20mm, and the coverage rate is 70-80%;

[0039] (5) Rolling with rubber wheels to make the gravel and asphalt bond well.

[0040] (6) Health preservation.

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Abstract

The present invention relates to asphalt road engineering, and is especially one stress absorbing asphalt macadam layer and its construction process. The stress absorbing asphalt macadam layer can absorb and reduce the stress of asphalt road surface or composite road surface and weaken the transmission of cracks to the surface asphalt layer. It consists of one macadam layer, one stress absorbing and binding layer and one connecting layer from top to bottom. Its construction process includes the steps of spreading connecting layer material onto the base layer, spreading the stress absorbing and binding layer and spreading the macadam layer. The stress absorbing and binding layer has material of polymer modified emulsified asphalt, high viscosity emulsified asphalt, hot SBS modified asphalt or rubber modified asphalt; and the connecting layer has material of kerosene diluted asphalt, high permeability emulsified asphalt, concrete interface adhesive, polymer modified emulsified asphalt or hot modified asphalt.

Description

technical field [0001] The invention relates to the field of asphalt pavement engineering, in particular to an asphalt macadam stress absorbing layer structure and a construction method thereof. It is suitable for absorbing and reducing the interlayer stress of semi-rigid base asphalt surface or composite pavement, and at the same time plays the role of waterproofing, bonding and protecting the underlying layer. Background technique [0002] At present, more than 90% of high-grade highway asphalt pavement bases and sub-bases in China use semi-rigid hydraulic materials, such as semi-rigid bases such as cement, lime, fly ash and other stable gravel and sand, which have become my country's high-grade highways. It is the main structure type of asphalt pavement and has been widely promoted and applied. [0003] With the continuous development of traffic demand, it is found in a large number of engineering practices that there are also some shortcomings in the semi-rigid base. Si...

Claims

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Application Information

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IPC IPC(8): E01C7/18
Inventor 徐培华蔡乾东徐玮杨子刚周振支
Owner 徐培华
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