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Design optimization method for porous elastic pavement mixture

An optimization method and technology of mixing materials, which are applied in the analysis of materials, strength characteristics, and the use of repetitive force/pulse force to test the strength of materials, etc., to achieve the effect of good pavement performance.

Active Publication Date: 2019-09-20
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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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 design optimization method for a porous elastic pavement mixture. The design optimization method belongs to the technical field of road engineering, and comprises the steps of: selecting a plurality of groups of design gradations according to an open gradation recommendation range, replacing fine aggregate in the gradations with rubber particles of equal volume and the same particle size according to a principle of equal volume replacement, adding a certain mass fraction of polyurethane, and determining the optimal gradation of materials according to an internal friction angle measured in a shear test; selecting a plurality of groups of polyurethane dosages, forming a test piece with a desired void ratio and soaking the test piece in water for maintenance, and determining the optimal polyurethane dosage by utilizing bending stress obtained in a bending test; and determining a porous elastic mixture mixing proportion according to the optimal polyurethane dosage and the optimal aggregate gradation, and conducting a water stability detection. The design optimization method is based on the shear resistance and bending resistance of the mixture, mainly considers the water damage of the porous elastic pavement mixture so as to solve the problem that the porous elastic pavement mixture design optimization has no rules to follow, and improves the use performance of the mixture.

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 Applications(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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