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Stress absorption structured llayer of discontinuous ajar particle distribution limit mixture for asphaltum with high viscosity

A high-viscosity asphalt and stress-absorbing technology, applied to building components, building structures, building insulation materials, etc., can solve the problems of increasing structure thickness and cost, limited stress absorption, loss of stress absorption function, etc., to reduce reflection cracks , high stress absorption, excellent anti-vertical shear effect

Inactive Publication Date: 2007-12-26
SHANGHAI PUDONG ROAD & BRIDGE CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this product has only absorption function and no structural function. After being used in the "white and black" projects in Beijing, Shanghai and other cities, it has been proved that its stress absorption effect is limited, and an additional structural layer is required, which undoubtedly increases the strength of the entire structure. thickness and cost
In addition, the "Strata" stress-absorbing layer will fundamentally lose its stress-absorbing function if it is structurally damaged in use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The component weight percentage of the high-viscosity asphalt discontinuous semi-open graded mixture used in the stress-absorbing structural layer is as any component in Table 1:

[0023] in:

[0024] High-viscosity asphalt binder: Take base asphalt and add 10% (mass ratio) RST modifier to modify it.

[0025] Taking GSOG-20 asphalt mixture as an example, the coarse aggregate and fine aggregate of the intermittent semi-open gradation mineral mixture are both made of diabase, and the gradation range of the coarse aggregate is 19.0, 16.0, 13.2, 9.5 and 4.75 mm (square hole particle size), the apparent relative density is 2.753; the gradation range of fine aggregate is 0.075, 0.15, 0.3, 0.6 and 1.18mm, 2.36mm (square hole particle size), and the apparent relative density is 2.728. The filling material is finely ground limestone powder with a density of 2.692g / cm3.

[0026] Table 1

[0027] Element

component 1

component 2

Component 3

High Visc...

Embodiment 2

[0033] The repair process of cement concrete pavement is as follows:

[0034] 1. Before covering the original cement concrete pavement, it does not need to be crushed.

[0035] 2. Carry out waterproof pretreatment on the cement concrete slab road first, paste the waterproof membrane seam adhesive layer, spread the modified emulsified asphalt adhesive layer, and sprinkle 3-6mm stone chips;

[0036] 3. Paving a 5.5 cm high-viscosity asphalt discontinuous semi-open graded mixture stress-absorbing structural layer of the present invention;

[0037] 4. Laying waterproof layer: 0.5cm slurry seal layer;

[0038] 5. Spread a 4cm wear-resistant surface layer of asphalt mastic mixture modified by SBS.

[0039] The overlay structure of the cement concrete pavement of the present invention has a good effect after being tried out in a number of "white plus black" projects. Some roads are used in harsh conditions, and a return visit after one year did not show any reflection cracks.

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Abstract

This invention relates to a stress absorption structure layer of asphalt intermittent high viscosity grade semi mixture laid between a cement concrete road surface and asphalt mixture worn layer taking Embedded crowded Mineral coarse aggregate as the frame to fill mastic fat composed of high viscosity asphalt combined material, mineral powder filling material, lignin fiber stabilizer and mineral fine material among the framework, the mass percentage includes: high viscosity asphalt combined material 5-6.50, mineral powder filling material 4-6.00, lignin fiber stabilizer .020-0.40 and the rest is the intermittent semi mixture.

Description

technical field [0001] The invention relates to road engineering, in particular to a stress-absorbing structural layer laid between the cement concrete road surface and the asphalt mixture surface layer when repairing the old cement concrete road surface. Background technique [0002] After a period of use, the cement concrete pavement will be damaged to varying degrees. Adding asphalt concrete surface layer (commonly known as "white plus black") on the cement concrete pavement can improve the use function of the cement pavement, improve the smoothness of the pavement, and prolong the service life of the cement pavement. However, the tensile effect caused by the shrinkage or displacement of the cement concrete slab in the horizontal direction, or the bending and tensile stress at the bottom of the surface layer, or the vertical shear stress at the joint or crack under the action of heavy traffic loads, will all occur on the asphalt concrete surface. Reflective cracks are pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C7/32C08L95/00C08J5/04C08K3/00C08L53/02C08L57/02
Inventor 徐斌赫振华连萍周晟徐韵淳
Owner SHANGHAI PUDONG ROAD & BRIDGE CONSTR
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