Proportion Design Method of Foamed Asphalt Cold Recycled Mixture Based on Internal Friction Angle and Cohesion

A technology of cold recycled mixture and foamed asphalt, applied in the direction of analysis materials, instruments, measuring devices, etc., can solve problems such as water damage, and achieve the effect of good performance

Active Publication Date: 2020-04-24
SOUTHEAST UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to address the two most dominant forms of failure in the use of foamed asphalt mixtures: water damage and permanent deformation due to the accumulation of shear strain

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  • Proportion Design Method of Foamed Asphalt Cold Recycled Mixture Based on Internal Friction Angle and Cohesion

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[0019] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention All modifications of the valence form fall within the scope defined by the appended claims of the present application.

[0020] The ratio design method of foamed asphalt cold recycled mixture with internal friction angle and cohesion, including determining the optimal gradation of recycled materials according to the internal friction angle measured by direct shear test or triaxial compression test; determining the optimal foaming conditions of asphalt Finally, 3 to 4 different dosages of foamed asphalt were selected, and the optimum water content was determined by compaction test; the s...

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Abstract

The invention discloses a mixture proportion design method for the cold regeneration of foamed asphalt with an internal friction angle and cohesive force. The method includes the steps of according tothe internal friction angle measured by a direct shear test or a triaxial compression test, determining the optimum gradation of a recycled material; after determining the optimum foaming condition of asphalt, selecting 3-4 different kinds of foamed asphalt dosages, using a compaction test to determine the optimum water content; molding under the optimum water content, soaking in water to keep araw test-piece, and determining the optimum foamed asphalt dosage by using the cohesive force obtained by the triaxial compression test; according to the optimum foamed asphalt dosage and the optimumgradation of the recycled material, determining the mixture proportion design of the cold regeneration of the foamed asphalt. The method has the advantages that compared with the existing foamed asphalt mixture design method based on dry-wet splitting strength, material tensile strength is considered, and meanwhile two uppermost destructional modes in the use process of the foamed asphalt mixtureare considered more contrapuntally, wherein the modes includes water damage and permanent deformation caused by continuous accumulation of shear strain.

Description

technical field [0001] The invention relates to a design method of foamed asphalt cold recycled mixture based on internal friction angle and cohesion force, belonging to the field of road engineering. Background technique [0002] Foamed asphalt cold recycling is one of the commonly used technologies in cold recycling of asphalt road materials. It can give full play to the residual value of old pavement materials and conforms to the general trend of low-carbon and environmental protection. The design method of foamed asphalt cold recycled mixture widely used at present is based on the design method of dry-wet splitting strength index, which fully considers the flexural and tensile properties of foamed asphalt mixture, but this method also has its limitations: it does not fully consider the foamed asphalt The shear resistance of the mixture, and the permanent deformation caused by the continuous accumulation of shear strain is one of the most important damage forms in the use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B26/26G01N19/04
Inventor 黄晓明赵润民黄若昀陈明虹汤钧尧
Owner SOUTHEAST UNIV
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