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A Design Optimization Method for Poroelastic Pavement Mixture

An optimization method and technology of mixing materials, applied in the direction of analyzing materials, strength characteristics, testing material strength by applying repeated force/pulsation force, etc., to achieve the effect of good pavement performance

Active Publication Date: 2022-02-08
SOUTHEAST UNIV
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Problems solved by technology

[0004] Purpose of the invention: In order to solve the problem that the design optimization of the poroelastic pavement mixture has no rules, the present invention proposes a design optimization method for the poroelastic pavement mixture. Bending performance, focusing on water damage resistance, makes the design optimization of poroelastic pavement mixture rule-based, and at the same time improves the performance of the mixture

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  • A Design Optimization Method for Poroelastic Pavement Mixture
  • A Design Optimization Method for Poroelastic Pavement Mixture

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Embodiment

[0044] Poroelastic pavement mixture specimens use 25% rubber particles (that is, replace all fine aggregates below 4.75mm), 20% porosity, three selected gradations, friction angle values ​​before and after equal volume replacement of rubber particles (mixed Polyurethane content 5% in the material) as table 2. According to the results in Table 2, gradation 3 is selected as the best aggregate gradation.

[0045] Select polyurethane content of 4%, 4.5%, 5%, 5.5%, choose aggregate gradation 3, use wheel rolling test to determine the number of wheel rolling under 20% void ratio is 24 times, form three-point bending test specimen, after 60 After 72 hours of health preservation in an incubator at ℃, put them in water at 20℃ for 24 hours, and perform a three-point bending test. The test results are shown in Table 3.

[0046] Table 2 Aggregate gradation and friction angle of three kinds of poroelastic mixtures

[0047]

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Abstract

The invention discloses a method for optimizing the design of a porous elastic pavement mixture, which belongs to the technical field of road engineering. For rubber particles with the same volume and particle size, add a certain number of parts by mass of polyurethane, and determine the optimal material gradation according to the internal friction angle measured by the shear test; select several groups of polyurethane dosage, form the test piece with the required void ratio and For the specimens soaked in water, use the bending stress obtained from the bending test to determine the optimal polyurethane dosage; determine the mix ratio of the poroelastic mixture according to the above optimal polyurethane dosage and the optimal aggregate gradation, and conduct a water stability test. This design optimization method is based on the shear resistance and bending resistance of the mixture, and focuses on the water damage of the poroelastic pavement mixture, so as to solve the problem that the design optimization of the poroelastic pavement mixture has no rules, and at the same time improve the performance of the mixture. Use performance.

Description

technical field [0001] The invention belongs to the technical field of road engineering, and in particular relates to a design optimization method for a porous elastic pavement mixture. Background technique [0002] Poroelastic pavement not only has high porosity, but also has good elasticity, which is an excellent structural form of noise-reducing pavement. A large number of actual measurements show that compared with densely graded asphalt pavement, poroelastic pavement can reduce noise by more than 10dB; compared with drainage asphalt pavement, poroelastic pavement can still reduce noise by more than 3dB. [0003] However, at present, there is no clear design method for the mix ratio optimization of poroelastic pavement mixtures, which is manifested in that no clear design index is proposed according to the mechanical characteristics of poroelastic pavement mixtures, resulting in no rules for the optimization of the mixture design; at the same time, the poroelastic paveme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/32
CPCG01N3/32G01N2203/0023G01N2203/0025G01N2203/0005
Inventor 廖公云祁孔庆谭华熊剑平李清雯方信汪璨
Owner SOUTHEAST UNIV
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