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A construction method of stress absorbing layer for road repair

A stress-absorbing layer and construction method technology, which is applied in the field of road engineering, can solve the problems of inconsistent deformation of concrete panels and joint concrete, weaken shrinkage cracks and reflection cracks, and cumbersome construction, so as to facilitate mechanized operation, extend road functions and Effect of service life, reduction of shrinkage cracks and transmission of reflective cracks to asphalt pavement

Inactive Publication Date: 2016-04-13
中国人民武装警察部队交通指挥部
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This paving material has the functions of waterproofing, bonding, and stress absorption, but it is used to solve the cracking problem of the panel caused by the inconsistent deformation of the concrete panel and the joint concrete
[0008] The Chinese invention patent with the authorized notification number CN101514536B discloses a stress-absorbing load-bearing composite structure of high-viscosity asphalt discontinuous gradation, the lower layer is high-viscosity asphalt discontinuous dense gradation mixture, and the upper layer is high-viscosity asphalt discontinuous semi-open gradation mixture The composite structure layer has good shear deformation resistance and good resistance to temperature shrinkage cracks and reflection cracks, but it is a double-layer composite structure with high cost and relatively cumbersome construction
[0009] The Chinese invention patent with the authorized notification number CN101148856B discloses a stress-absorbing layer of asphalt ore and its construction method. At the same time, the cement concrete pavement is firmly bonded to the asphalt surface paved above it, but it needs to be laid three times, and the construction is cumbersome

Method used

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  • A construction method of stress absorbing layer for road repair
  • A construction method of stress absorbing layer for road repair
  • A construction method of stress absorbing layer for road repair

Examples

Experimental program
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Effect test

Embodiment 1

[0060] 1. Preparation of modified asphalt

[0061] 1) Put heavy traffic asphalt AH-70 in a mixer, heat it at 120°C to melt, add modifier and stabilizer, heat and keep stirring at 140°C to prepare asphalt mixture, in which the modifier is made of star Type SBS (commercially available various types of star SBS, such as SBS4303 produced by Yanshan Petrochemical), linear SBS (commercially available various types of linear SBS, such as Yueyang Petrochemical produced YH791) and styrene-butadiene latex (solid content 65%), the weight ratio of star SBS, linear SBS and styrene-butadiene latex is 3:2:2; the stabilizer is composed of calcium chloride and polyacrylamide with a weight ratio of 1:1, asphalt, The weight ratio of modifier and stabilizer is 92.5:7.0:0.5, and the stirring time is 60min;

[0062] In the embodiment of the present invention, heavy traffic asphalt AH-70 is used as the base asphalt, except for heavy traffic asphalt AH-70, other pavement asphalts are suitable for th...

Embodiment 2

[0092] In the process of preparing modified asphalt, except that the weight ratio of asphalt, modifier and stabilizer is 90:8.5:1.5, the asphalt is selected from heavy traffic asphalt AH-90, and the modifier is composed of star SBS, linear SBS and butyl Composed of benzene latex, the weight ratio of star SBS, linear SBS and styrene-butadiene latex is 3: 2: 1, and the stabilizing agent is 2: 1 dicumyl peroxide (DCP) and 4 , 4'-dithiodimorpholine (DTDM), the melting temperature of asphalt is 145°C, the stirring temperature is 145°C, and the stirring time is 60min; the temperature of high-speed shearing treatment is 170°C, and the rotation speed is 1200r / min , the time is outside 45min, all the other are identical with embodiment 1;

[0093] In this embodiment, the content of the modifier in the asphalt mixture is 8.5%, and the content of the modifier in the asphalt mixture is 8%-9%, which are all suitable for the present invention;

[0094] The technical indicators of high elas...

Embodiment 3

[0101] In the process of preparing modified asphalt, except that the weight ratio of asphalt, modifier and stabilizer is 87.5:10:2.5, the asphalt is selected from heavy traffic asphalt AH-90, and the modifier is composed of star SBS, linear SBS and butyl Composed of benzene latex, the weight ratio of star SBS, linear SBS and styrene-butadiene latex is 1:4:2, the stabilizer is sodium carboxymethyl cellulose, the heating and melting temperature of asphalt is 145°C, and the stirring temperature is 160°C ℃, stirring time is 50min; the temperature of high-speed shearing treatment is 160 ℃, and the rotating speed is 800r / min, and the time is 30min, all the other are identical with embodiment 1;

[0102] In this embodiment, the content of the modifier in the asphalt mixture is 10%, and the content of the modifier in the asphalt mixture is 9%-10%, which are all suitable for the present invention;

[0103] The technical indicators of high elastic SBS modified asphalt are shown in Table...

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Abstract

The invention relates to the technical field of road engineering, and discloses a construction method of a stress absorbing layer for road repairing. The construction method comprises the following steps of: carrying out high-speed shearing on substrate asphalt, a modifying agent and a stabilizing agent after being mixed uniformly to prepare modified asphalt; mixing coarse aggregate, fine aggregate, stuffing and the modified asphalt to prepare a stress absorbing mixture; paving the stress absorbing mixture on a road surface to be repaired, wherein the road surface to be repaired is subjected to purification treatment; and rolling to form the stress absorbing layer. The construction method disclosed by the invention has the advantages of mechanized operation, simplicity and convenience in construction process and low economic cost; the formed stress absorbing layer has the characteristics of high flexibility and high deformation restoring capacity, and can be used for effectively absorbing interlaminar stress produced during the paving of an asphalt surface layer on an old cement concrete road surface as well as weakening and delaying the transfer of contraction cracks and reflection cracks on the cement concrete road surface to the asphalt surface layer; and therefore road performance of the asphalt surface layer is improved, and service life of the asphalt surface layer is prolonged.

Description

technical field [0001] The invention relates to the technical field of road engineering, in particular to a method for road repair and construction of a stress-absorbing layer, which is used to absorb the interlayer stress when the old cement concrete pavement is paved with an asphalt surface layer, and weaken and delay shrinkage cracks and reflections of the cement concrete pavement. The transmission of cracks to the asphalt pavement prolongs the road function and service life of the asphalt pavement. Background technique [0002] After a period of use, the concrete pavement will be damaged to varying degrees, especially the shrinkage stress caused by the ambient temperature difference, and the main reason for the damage of the cement concrete pavement caused by the reflected stress of the roadbed. Adding asphalt surface layer on the cement concrete pavement is a special structure form of "white plus black" pavement introduced by the highway structure type in our country. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01C7/18C04B26/26
Inventor 董建平梁清源
Owner 中国人民武装警察部队交通指挥部