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BRT station heavy traffic road section pavement structure and construction method

A construction method and transportation technology, which is applied to the coagulation pavement, roads, roads and other directions of on-site paving, can solve the problems of inability to meet the traffic characteristics of BRT, complicated maintenance and construction, and prone to cracking, so as to reduce the risk of material cracking and improve the Construction feasibility and effect of increasing strength

Pending Publication Date: 2021-12-31
SHANGHAI MUNICIPAL ENG DESIGN INST GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional SBS modified asphalt or ultra-high viscosity modified asphalt mixture can improve the anti-rutting performance of conventional asphalt pavement, but such modified asphalt materials still cannot meet the traffic characteristics of BRT; traditional high-strength cement concrete pavement or semi-flexible The pavement is prone to cracks and other diseases, and the maintenance and construction in the later stage are complicated, and the applicability is poor in heavy-duty and heavy-traffic areas of BRT stations

Method used

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  • BRT station heavy traffic road section pavement structure and construction method

Examples

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Comparison scheme
Effect test

Embodiment 1

[0054] A pavement structure of BRT heavy-duty traffic section:

[0055] (1) Steel slag and basalt rock are used together as coarse aggregate, and the mass ratio of steel slag to basalt coarse aggregate is 4:6. The content of free calcium oxide in steel slag is 1.2%, and the polishing value is 51. A stabilizer composed of SBS modified asphalt, high-viscosity modifier (amount of 11% of the mass of SBS modified asphalt), methyltriethoxysilane and zinc methacrylate in a mass ratio of 3:1 (amount of 0.5% of the mass of SBS modified asphalt), mixed and sheared at 185°C for 45 minutes, and developed at 165°C for 2 hours to prepare ultra-high viscosity modified asphalt. Its performance classification is PG 88-22, and its dynamic viscosity at 60°C is 48×10 4 Pa·s, the softening point is 104°C, the viscous toughness is 24.6N·m, and the toughness is 16.1N·m. The fibers are flocculent lignin fibers mainly made of raw wood pulp, and the dosage is 0.3% of the mass of the asphalt mixture....

Embodiment 2

[0069] A pavement structure of BRT heavy-duty traffic section:

[0070] (1) Select basalt rock as coarse aggregate. A stabilizer composed of SBS modified asphalt, high-viscosity modifier (the dosage is 8% of the mass of SBS modified asphalt), bisthiocarbonyl dimethylamine disulfide and methacrylate in a mass ratio of 2:1 (mixed The amount is 0.3% of the mass of SBS modified asphalt), mixed and sheared at 175°C for 40 minutes, and developed at 160°C for 2 hours to prepare ultra-high viscosity modified asphalt. Its performance classification is PG 88-22, and its dynamic viscosity at 60°C is 33×10 4 Pa·s, the softening point is 93°C, the viscous toughness is 22.1N·m, and the toughness is 15.6N·m. The fibers are flocculent lignin fibers mainly made of raw wood pulp, and the dosage is 0.3% of the mass of the asphalt mixture. The dosage of high modulus additive is 0.3% of the mass of asphalt mixture. The auxiliary agent is a mixture of hydroxyfluorosilicone oil and Sasobit wax a...

Embodiment 3

[0084] A pavement structure of BRT heavy-duty traffic section:

[0085] (1) Steel slag and diabase rock are selected to form coarse aggregate at a mass ratio of 6:4. The content of free calcium oxide in steel slag is 1.2%, and the polishing value is 51.

[0086] A stabilizer composed of SBS modified asphalt, high-viscosity modifier (amount of 15% of the mass of SBS modified asphalt), methyltriethoxysilane and zinc methacrylate in a mass ratio of 2:1 (amount of 0.8% of the mass of SBS modified asphalt), mixed and sheared at 188°C for 50 minutes, and developed at 165°C for 2 hours to prepare ultra-high viscosity modified asphalt. Its performance classification is PG 88-22, and its dynamic viscosity at 60°C is greater than 58×10 4 Pa·s, the softening point is 109°C, the viscous toughness is 26.1N·m, and the toughness is 17.3N·m. The fibers are flocculent lignin fibers mainly made of raw wood pulp, and the dosage is 0.3% of the mass of the asphalt mixture. The dosage of high m...

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Abstract

The invention discloses a BRT station heavy traffic road section pavement structure and a construction method. The pavement structure is composed of a high-viscosity high-modulus skeleton dense type mixture upper surface layer, a modified asphalt macadam connecting layer, a rigid-flexible composite asphalt mixture middle surface layer, and a modified asphalt suspension dense type mixture lower surface layer. The mixture upper surface layer is composed of fine-particle-size aggregate, ultrahigh-viscosity modified asphalt, a fiber stabilizer, a high-modulus additive and the like, and the anti-loosening and anti-deformation capacity of the surface layer is improved; the connecting layer is composed of aggregate with a single particle size and modified asphalt; the middle surface layer is formed by pouring mixed base slurry into a matrix asphalt mixture, so that the overall bearing capacity of the pavement layer is improved; and the mixture lower surface layer is composed of medium-grain or coarse-grain aggregate and modified asphalt, and the stability of the pavement layer is improved. The pavement structure is high in overall strength, strong in rut deformation resistance, good in durability and excellent in surface layer wear resistance and slide resistance, and can effectively improve the pavement quality and prolong the service life of the heavy traffic road section of a BRT station.

Description

technical field [0001] The invention belongs to the technical field of road traffic and transportation engineering, and in particular relates to a pavement structure and a construction method of a heavy-duty traffic section of a BRT station. Background technique [0002] In recent years, with the rapid advancement of my country's urbanization process, the number of motor vehicles has increased year by year, and the problem of urban traffic congestion has become increasingly prominent, which puts forward higher requirements for urban public transportation. Urban Bus Rapid Transit (BRT for short) is a new type of public passenger transport system between rapid rail transit and conventional public transport. It can effectively enhance public transport capacity and reduce traffic congestion. It has gradually become one of the important solutions to urban traffic problems. one. Because it adopts closed stations and dedicated lanes, its operation effect is close to that of rail t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C7/18E01C7/32E01C7/26
CPCE01C7/18E01C7/32E01C7/26E01C7/185E01C7/262E01C7/265E01C7/182E01C7/325
Inventor 吴立报郑晓光陈亚杰水亮亮任奇徐弯弯
Owner SHANGHAI MUNICIPAL ENG DESIGN INST GRP
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