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A Calculation Method of Asphalt and Aggregate Spalling Rate of Asphalt Pavement

A technology of asphalt pavement and calculation method, which is applied in the field of building materials, can solve problems such as uncontrollable temperature, complicated operation, and high technical difficulty, and achieve the effect of convenient operation, low cost, and high reliability

Active Publication Date: 2021-01-26
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Qualitative methods mainly include boiling method and water immersion method. These two methods are simple to operate, but both boiling and water immersion are clean water damage methods, and the temperature is uncontrollable. The degree of agreement with the actual road water damage method is not high. And the experimental results have a large human factor
Quantitative methods mainly include photoelectric colorimetry, photoelectric spectrophotometry, etc. The test results of photoelectric colorimetry are too large, and the calculated asphalt peeling amount also includes the amount of asphalt film dissolved in the solution. The reproducibility of the test results is poor. Complicated; while the agitated water net adsorption method has good reproducibility and few external interference factors, but its technical difficulty is great
The above methods can only simply simulate the spalling rate of asphalt and aggregates in a specific environment in terms of test conditions, and cannot simulate the actual water damage on the road surface

Method used

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  • A Calculation Method of Asphalt and Aggregate Spalling Rate of Asphalt Pavement
  • A Calculation Method of Asphalt and Aggregate Spalling Rate of Asphalt Pavement
  • A Calculation Method of Asphalt and Aggregate Spalling Rate of Asphalt Pavement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] In step 1), coarse aggregates with a particle size of 13 mm to 19 mm and a regular shape are selected. After the coarse aggregate is coated with asphalt, soak in water and boil for 3 minutes, then take it out. Mass loss, which is used to characterize the asphalt exfoliation rate of asphalt-coated aggregates after water boiling.

[0043] The calculation process of the asphalt spalling rate of the asphalt-coated aggregate after boiling treatment is as follows:

[0044] 1) Take 5 washed and regular-shaped coarse aggregates (number 1 # ~5 # ) placed in an oven at 105°C±5°C for 1 hour, and then hung on an analytical balance with strings and weighed respectively, and the dry mass of 5 coarse aggregates was measured respectively, and weighed W 1 .

[0045] 2) Pour an appropriate amount of asphalt into a container, raise the temperature to 150°C, immerse the coarse aggregates that have been dried in step 1) and tied with thin threads into the asphalt, and keep the temperatur...

Embodiment 2

[0068] Change the parameter settings of the water damage sensitivity tester in the step (1) of Example 1, set the temperature to 20°C, the pressure value to 30psi, and the number of dynamic water cycle damages to be 2000 times, and the rest of the steps are consistent with those in Example 1 . Substitute the parameters into the formula y=(a×f+b×t+c×p) / η(f is the number of dynamic water damage, t is temperature, p is pressure, a=0.004, b=0.2, c=0.2 are respectively The service life factors of dynamic water damage times, temperature and pressure, η is the real simulation degree of dynamic water damage), the real simulation degree of dynamic water damage η=95% of the water damage sensitivity tester, the temperature is 20 ℃, the pressure value is 30psi, dynamic water damage cycles of 2000 times correspond to the actual damage period of asphalt concrete pavement is 18.9 years;

[0069] Refer to Table 1 in Example 1 for the bitumen spalling rate of the boiling method, and see Table...

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Abstract

The invention discloses a method for calculating the spalling rate of asphalt and aggregates on asphalt pavement, which comprises the following steps: 1) processing asphalt-coated aggregates by using a water boiling method, and calculating the rate of asphalt-coated aggregates after boiling Asphalt spalling rate; 2) Use the water damage sensitivity tester to simulate the real water damage mode of the pavement, calculate the asphalt spalling rate of the asphalt-coated aggregate after dynamic water damage, and fit the spalling rate and water damage after dynamic water damage treatment. The spalling rate after boiling, obtain the relational expression of the asphalt spalling rate after moving water damage and boiled damage; 3) Utilize the temperature, pressure and times of the water damage sensitivity tester to calculate the actual damage period of the asphalt pavement, calculate the actual pavement Spalling rates of asphalt and aggregates at different ages. The invention realizes the quantitative calculation of the spalling rate of asphalt and aggregates under different service life of the asphalt concrete pavement by the water boiling method, is convenient to operate, low in cost, has high reliability of the test result and conforms to the actuality of the pavement engineering.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a method for calculating the spalling rate of asphalt and aggregates on asphalt pavement. Background technique [0002] In the field of road construction materials, the adhesion between aggregate and asphalt is an important index to evaluate the water damage resistance of asphalt mixture, and early water damage is an important factor affecting the service life of high-grade asphalt pavement. The form of this damage is that the asphalt peels off from the surface of the aggregate, thereby reducing the bonding force between the asphalt and the aggregate, and reducing the strength and stability of the asphalt pavement. Therefore, it is of great significance for the prevention and maintenance of asphalt pavement water damage to be able to use a simple method to simulate the water damage in the actual pavement and calculate the spalling of asphalt and aggregates. [0003] A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N5/04G01N1/28G06F30/20
CPCG01N1/28G01N5/04G06F30/20
Inventor 谢君周小俊吴少鹏杨超胡锐杨东张登峰
Owner WUHAN UNIV OF TECH
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