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A method for balanced design of recycled asphalt mixture based on uniaxial penetration test

A technology of reclaimed asphalt and uniaxial penetration, applied in the direction of applying stable tension/pressure to test material strength, analyzing materials, instruments, etc., can solve problems such as poor high temperature performance and poor crack resistance, and achieve simple design methods, Strong practicality and high efficiency

Active Publication Date: 2021-10-26
SHANDONG TRAFFIC PLANNING DESIGN INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] For recycled asphalt mixture, the water stability is basically the same as that of new asphalt mixture, and the high temperature stability is better than that of new asphalt mixture. For the same recycled asphalt mixture, the higher the amount of recycled asphalt mixture, the better the high temperature performance. Good, but the crack resistance is worse; on the contrary, the less the amount of recycled material is, the better the crack resistance is, and the high temperature performance is poor

Method used

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  • A method for balanced design of recycled asphalt mixture based on uniaxial penetration test
  • A method for balanced design of recycled asphalt mixture based on uniaxial penetration test
  • A method for balanced design of recycled asphalt mixture based on uniaxial penetration test

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Embodiment 1

[0065] (1) Using the molding method of rotary compaction, form two sets of recycled asphalt mixture specimens with different dosages (at least four dosages), and at least three parallel specimens for each dosage of recycled asphalt mixture in each group , its dimensions are: both height and diameter are 100mm;

[0066] (2) The first group of recycled asphalt mixture specimens with different dosages were subjected to a uniaxial penetration test at 60 °C. Control the temperature of the test piece and the indenter in a 60°C temperature control box to ensure that the holding time of the test piece is more than 4 hours. The uniaxial penetration test was carried out with a press, using an indenter with a diameter of 28.5mm to ensure that the indenter was in the center, the test temperature was 60°C, the loading rate was 1mm / min, and the load was completely destroyed, and the pressure and pressure during the test were collected. Displacement curve, analyze and calculate the shear stre...

Embodiment 2

[0071] Uniaxial penetration test such as figure 1 , that is to pressurize the cylindrical asphalt mixture specimen through a circular indenter. The size of the cylindrical specimen is 100mm in height, 100mm in diameter, and the diameter of the circular indenter is 28.5mm. The failure inflection point of the load curve is selected as the penetration strength of the specimen for shear failure, and then the shear strength of the asphalt mixture is calculated.

[0072] In order to verify the feasibility of evaluating the crack resistance of asphalt mixtures through uniaxial penetration tests at 25°C, this application conducts a three-dimensional finite element analysis on the force model of the semicircular bending test and uniaxial penetration test, and sets the material properties of the two models Similarly, the material is set as a linear elastic body, Poisson's ratio μ=0.3, and elastic modulus E=1000Mpa. The size of the semicircle specimen is 150mm in diameter and 50mm in th...

Embodiment 3

[0076] According to the current domestic specification requirements "Technical Specifications for Highway Asphalt Pavement Recycling" (JTG F41-2008), the design method of hot recycled asphalt mixture is carried out with reference to the design method of the target mix ratio of hot mix asphalt mixture.

[0077] 3.1 Determination of properties of RAP materials

[0078] 3.1.1 Determination of old asphalt content

[0079] The RAP material is the waste asphalt mixture recovered from a mixing plant in Zhangqiu, Jinan. Before extracting the RAP material, the RAP material is first screened. After the old material is crushed by the crusher in the mixing station, it is divided into three grades of 0-5mm, 5-10mm, 10-15mm, and 0-10mm. .

[0080] Table 1 shows the test results of the third grade RAP material after the centrifugal extraction method.

[0081] Table 1 Results of asphalt content of third grade RAP materials

[0082]

[0083] 3.1.2 Determination of old asphalt properties...

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Abstract

The invention is a method for balanced design of recycled asphalt mixture based on uniaxial penetration test. Based on the uniaxial penetration test, the linear relationship between the old material proportion and the high temperature performance is obtained through the uniaxial penetration test of different amounts of recycled asphalt mixture at 60°C, and the lower limit of the old material proportion that can meet the high temperature performance is determined. The uniaxial penetration test of the recycled asphalt mixture at 25°C obtained the linear relationship between the ratio of old materials and the anti-crack performance, and determined the upper limit of the ratio of old materials that can meet the anti-crack performance. Optimum dosage ratio of asphalt mixture.

Description

technical field [0001] The invention belongs to the technical field of application of mix ratio design of recycled asphalt mixture, and in particular relates to a method for balanced design of recycled asphalt mixture Background technique [0002] The amount of old materials in the recycled asphalt mixture not only affects the performance of the pavement, but also affects the economy. The utilization ratio of old materials in asphalt pavement plant mixing heat recycling is 10%-30%, which reduces the project cost by 20%-30% on average; the utilization ratio of old materials in in-situ hot regeneration of asphalt pavement is 70-100%, which reduces the project cost by 20% on average %-25%. It can be seen that as an effective technical solution for old road maintenance and repair, asphalt pavement regeneration technology has obvious advantages in terms of economic and social benefits. At present, in most projects, the RAP content of recycled asphalt mixture is judged according...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0019G01N2203/0062
Inventor 毕玉峰于大海马川义丁婷婷王健庄伟陈昊周鹏飞许孝滨
Owner SHANDONG TRAFFIC PLANNING DESIGN INST
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