Construction method of large-gap thin overlay

A technology of thin-layer overlay and construction method, which is applied to cohesive pavement paved on site, roads, roads, etc., can solve the problems of large void ratio, poor road cohesion, and rapid temperature loss of ultra-thin overlays with large voids. Achieve the effects of saving maintenance costs, improving anti-skid performance, and reducing risks

Pending Publication Date: 2020-10-13
RES INST OF HIGHWAY MINIST OF TRANSPORT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the ultra-thin overlay with large voids has a large void ratio and a thin thickness, resulting in faster temperature loss, relatively small compaction work, and poor adhesion to the road surface, so there are great difficulties in the construction process

Method used

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  • Construction method of large-gap thin overlay

Examples

Experimental program
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Effect test

Embodiment 1

[0039] The implementation of the present invention is described by taking the drainage asphalt pavement maintenance of Jiangsu Coastal Expressway. It has been 13 years since the high-speed drainage asphalt pavement was opened to traffic. In order to further improve the safety performance of the road surface in rainy days, a PUC-10 large-gap thin-layer cover is paved to maintain and repair the drainage asphalt pavement. Pavement improvement technology solutions such as figure 1 shown. The design porosity of PUC-10 large-void thin-layer overlay is 20.0%, and the thickness is 2.5cm.

[0040] The construction steps of PUC-10 large void thin layer overlay are as follows:

[0041] 1. Preparation before construction: Prepare basalt coarse aggregate, limestone fine aggregate, limestone powder, SBS modified asphalt, high viscosity additives, polyester fiber, use modified asphalt and pre-wrapped crushed stone as a waterproof bonding layer; , in terms of mass, the amount of high-visco...

Embodiment 2

[0063] The implementation of the present invention will be described with the drainage asphalt pavement maintenance of Jiangsu Yanjing Expressway. In order to repair the local scattering disease of the drainage asphalt pavement, the drainage asphalt pavement is maintained and repaired by paving the PUC-5 large-void thin-layer cover, and the technology is verified and summarized. Pavement improvement technology solutions such as figure 1 shown. The designed porosity of the PUC-5 large-void thin-layer overlay is 18.0%, and the thickness is 1.2cm.

[0064] The construction steps of PUC-5 large void thin layer overlay are as follows:

[0065] 1. Preparation before construction: prepare basalt coarse aggregate, limestone fine aggregate, limestone powder, SBS modified asphalt, high-viscosity additives, polyester fiber, and use high-viscosity modified emulsified asphalt as a waterproof bonding layer; among them, the quality Calculated, the amount of high-viscosity additives accoun...

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Abstract

The invention belongs to the field of road engineering, and particularly relates to a construction method of a large-gap thin overlay. The method sequentially comprises the following steps of preparing raw materials of the large-gap thin overlay and a waterproof bonding layer, stirring the raw materials, preheating, paving and rolling, wherein a temperature of the materials is maintained at 140-195 DEG C in a process from completion of material mixing to paving. The construction process is an effective construction process of a large-gap thin mixture, main technical indexes and durability of the constructed overlay are equivalent to those of a densely-graded thin overlay, meanwhile, remarkable drainage, skid resistance and noise reduction functions are possessed, and the method has important significance in popularization and application of the structure.

Description

technical field [0001] The invention belongs to the field of road engineering, and in particular relates to a construction method of a large-gap thin-layer overlay. Background technique [0002] Porous ultrathin Wearing Course, referred to as PUC overlay, the mixture is made of fine-grained coarse aggregate to form a skeleton structure, the porosity is generally 14% to 25%, and the thickness is 0.8cm to 2.5cm . Compared with densely-graded pavement and drainage asphalt pavement, large-void thin-layer overlay has two remarkable features. One is to maintain a design void ratio similar to that of drainage pavement, but the thickness is thinner than drainage asphalt pavement; the other is to have The same design thickness as ordinary compact ultra-thin overlays, but with greater void ratio. [0003] The surface texture of the large-gap thin-layer overlay is deep, and an interlocking effect is formed between the tire and the surface texture when the vehicle is running at high s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C7/35
CPCE01C7/358
Inventor 李明亮李俊武昊
Owner RES INST OF HIGHWAY MINIST OF TRANSPORT
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