Wearing course for preventive maintenance technology and its construction method

A technology of preventive maintenance and wear layer, which is applied to the cohesive pavement paved on site, roads, roads, etc., can solve the problems of overlay cracking, durability reduction of ultra-thin wear layer, and peeling of the mixture, so as to improve the durability Fatigue performance, long curing time, effect of improving bond strength

Active Publication Date: 2015-11-18
GUANGXI JINMENG ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The construction of ultra-thin wear layer on such a pavement is prone to reflective cracks, resulting in cracking of the overlay from bottom to top, which reduces the durability of the ultra-thin wear layer
Even if the dowel bar is repaired and an ultra-thin wearing layer is laid on the cement concrete, the dowel bar will still gradually fail under the repeated action of the vehicle, and the reflective cracks will eventually expand, eventually leading to premature failure of the ultra-thin wearing layer
[0006] In addition, if the bonding strength between the ultra-thin wearing layer mixture and the original road surface is not enough, the wearing layer is prone to the mixture spalling disease under the comprehensive action of the vehicle and the natural environment

Method used

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  • Wearing course for preventive maintenance technology and its construction method
  • Wearing course for preventive maintenance technology and its construction method
  • Wearing course for preventive maintenance technology and its construction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] When the ultra-thin wearing layer 4 mixture design porosity is 3%-6%, discontinuous dense gradation, AH-70# matrix asphalt 80.7-87.8 parts, SBS modifier 2-3 parts, rubber powder 10-14 parts, 0-2 parts of compatibilizer and 0.2-0.3 parts of stabilizer form low-SBS high-rubber powder composite modified asphalt, which is in the nature of rubber powder modified asphalt, which can improve the high-temperature stability and crack resistance of the mixture, and can be combined with The stress absorbing layer 2 is closely bonded.

[0039] Raw material preparation:

[0040] (1) Material preparation for stress absorbing layer 2. Take 18 parts of 60-mesh rubber powder, 82 parts of base asphalt, and 0.25 parts of stabilizer. Heat the base asphalt to 180-190°C, put rubber powder into the base asphalt and stir for 2-3 hours, then add stabilizer and stir for 0.5 hours to prepare rubber powder modified asphalt. The manufacturing process is on-site modification, and the storage of ru...

Embodiment 2

[0059] When the design porosity of ultra-thin wearing layer 4 mixture is discontinuous and semi-open gradation greater than 10%, AH-70# base asphalt is 91.7-95.3 parts, SBS modifier is 3.5-4 parts, rubber powder is 1-4 parts, The stabilizer is 0.2-0.3 parts to form a high SBS low rubber powder composite modified asphalt, and the composite modified asphalt has the property of SBS modified asphalt (I-D). Low-volume rubber powder can also be used in intermittent dense graded mixtures.

[0060] (1) The material of the stress absorbing layer 2 is the same as that in Embodiment 1.

[0061] (2) Rubber powder modified asphalt adhesive layer 3 adopts the rubber powder modified asphalt of Example 1.

[0062] (3) Preparation of ultra-thin wear layer 4 materials. Take 93.1 parts of AH-70 asphalt, 3.7 parts of linear SBS modifier, 3 parts of rubber powder, and 0.2 parts of stabilizer. The base asphalt is divided into groups A, B and C, group A: group B: group C = 1: 0.6-0.7: 0.6-0.7. A...

Embodiment 3

[0073] Ultra-thin wearing layer 4 mixture design porosity of 3%-6% discontinuous dense gradation, AH-70# base asphalt 93.8 parts, SBS modifier 4 parts, rubber powder 2 parts, stabilizer 0.2 parts, Group A 42, group B 25.9, C group 25.9. Others were carried out according to Example 2 to obtain composite modified asphalt.

[0074] (1) The material of the stress absorbing layer 2 is the same as that in Embodiment 1.

[0075] (2) The rubber powder modified asphalt of Example 1 is used for the bonding layer.

[0076] (3) Preparation of ultra-thin wear layer 4 materials. The ultra-thin wearing layer 4 includes 5.9 parts of composite modified asphalt, 100 parts of aggregate, 10 parts of filler, and 0.3 part of fiber. Aggregate includes 85 parts of coarse aggregate and 15 parts of fine aggregate.

[0077] Construction method:

[0078] The construction method of the stress absorption layer 2 and the rubber powder modified asphalt adhesive layer 3 is the same as that of the embodim...

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Abstract

The invention discloses a wearing layer for a preventive maintenance technology and a construction method of the wearing layer. The wearing layer for the preventive maintenance technology comprises an ultrathin wearing layer, a rubber powder modified asphalt bonding layer, and a stress absorbing layer connected to the upper surface of an original pavement, wherein the upper surface of the rubber powder modified asphalt bonding layer is connected with the ultrathin wearing layer, and the lower surface of the rubber powder modified asphalt bonding layer is connected with the stress absorbing layer. According to the wearing layer, the shearing action of a cement concrete crack or the expansion of an asphalt concrete reflection crack can be eliminated, good bonding property of rubber powder asphalt can be utilized, an original cement concrete pavement, the stress absorbing layer and the ultrathin wearing layer are bonded into an integral body to form a good covering surface which resists cracking, impaction, seepage and stripping, and finally the purpose of long maintenance time is achieved, and thus the wearing layer has great significance.

Description

technical field [0001] The invention relates to a preventive maintenance treatment technology for high-grade pavement, in particular to a wear layer used in the preventive maintenance technology and a construction method thereof. Background technique [0002] Preventive maintenance technology evaluates road conditions through road surface inspection. When early road diseases appear, maintenance technology is adopted in time to prevent road surface diseases from penetrating into the grassroots or structural irreversible diseases, so that the road surface regains good road conditions and delays or avoids major repairs. expensive costs. [0003] The ultra-thin wearing layer technology can be used for new roads, mainly when early road diseases appear. At present, domestic ultra-thin wear layer technology is mainly based on main, or in Basically, replace the compound with SMA, OGFC grade compound. [0004] The ultra-thin wearing layer includes the repair of the original roa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01C7/35E01C7/26C04B26/26
Inventor 刘宇侯海元吴忠杰杨鹰黄新颜周玮罗宏伟罗桂银梁延明王起坤高韬张坚
Owner GUANGXI JINMENG ENG
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