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Mixture proportion design method for cold regeneration of foamed asphalt with internal friction angle and cohesive force

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

Active Publication Date: 2018-01-05
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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  • Mixture proportion design method for cold regeneration of foamed asphalt with internal friction angle and cohesive force

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Embodiment Construction

[0019] In the following, the present invention will be further clarified with reference to the accompanying drawings and specific embodiments. It should be understood that these examples are only used to illustrate the present invention and not to limit the scope of the present invention. After reading the present invention, those skilled in the art will understand various aspects of the invention. Modifications of the price form fall within the scope defined by the appended claims of this application.

[0020] The design method of foamed asphalt cold recycled mixture ratio design method of internal friction angle and cohesive force, including determining the best gradation of recycled materials based on the internal friction angle measured by direct shear test or triaxial compression test; determining the best foaming condition of asphalt Then select 3 to 4 different foamed asphalt dosages, use compaction test to determine the optimal moisture content; shape and immerse the water...

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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 method for designing foamed asphalt cold recycled mixture based on internal friction angle and cohesion, and belongs to the field of road engineering. Background technique [0002] Foamed asphalt cold recycling is one of the commonly used technologies for cold recycling of asphalt road materials. It can give full play to the residual value of old road materials and conform to the trend of low-carbon environmental protection. The widely used foamed asphalt cold recycled mixture design method is a design method based on the wet and dry splitting strength index, which fully considers the flexural and tensile properties of the 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 forms of damage during the use of the foamed asphal...

Claims

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Application Information

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Patent Type & Authority Applications(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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