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A device for detecting road surface damage caused by twisting action and its measuring method

A function and hydraulic device technology, applied in the direction of applying repeated force/pulsation force to test the strength of materials, etc., can solve the problems of no test method and detection index, and solve the problems that cannot be delayed, so as to facilitate the picking and placing of parts and test observation and test The effect of convenient operation

Inactive Publication Date: 2018-02-23
CHANGAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the pavement damage caused by the complex traffic load of the special road section mentioned above, the specification does not have specific test methods and detection indicators
[0005] To sum up, at present, there are corresponding solutions for the looseness of asphalt pavement caused by water damage and the evaluation of construction workability through the looseness of asphalt mixture in the case of mixing. For the inspection of asphalt mixture water damage and construction mixing The looseness inspection technology in the process of integration has been mature, but the damage to the asphalt pavement under the action of vehicles and aircraft tires, such as the action of an aircraft on a runway, and the impact of vehicles on special road sections such as parking lots, intersections, and long longitudinal slopes There are currently no specific test methods and detection indicators for road surface looseness, falling grains, peeling and other diseases caused by the action, but it is urgent to solve these problems

Method used

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  • A device for detecting road surface damage caused by twisting action and its measuring method
  • A device for detecting road surface damage caused by twisting action and its measuring method
  • A device for detecting road surface damage caused by twisting action and its measuring method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Three different No. 90 ordinary asphalt mixtures are graded and mixed according to OGFC-13. Among them, No. 1 is Karamay No. 90, No. 2 is Donghai No. 90, and No. 3 is Zhonghai No. 90, and rutting plates are made according to the test specifications. Several test pieces were placed at room temperature to cool for 12 hours and then released from the mold for later use. Adopt the device of the present invention to carry out the test, set the pressure as 0.7MPa, and the temperature as 20°C, respectively take and record the loss mass of the rut slabs made of three kinds of asphalt at 10min, 20min, 30min, 40min, 50min and 60min, and the result Table 1 and image 3 shown.

[0057] Table 1 OGFC-13 mixture mass loss

[0058]

[0059] From Table 1 and image 3 It can be seen that the asphalt pavement of OGFC-13 asphalt mixture has a tendency to gradually adapt to the "twisting" effect with the increase of the action time at 0.7MPa and 20°C, the action surface will become sm...

Embodiment 2

[0061] Three different No. 90 ordinary asphalt mixtures were mixed according to AC-13 grades, among which No. 1 was Karamay No. 90, No. 2 was Donghai No. 90, and No. 3 was Zhonghai No. 90. Rutting plates were made according to the test specifications Several test pieces were placed at room temperature to cool for 12 hours and then released from the mold for later use.

[0062] Utilize the device of the present invention to carry out the test, set the pressure as 0.7MPa, and the temperature as 60°C. Weigh and record the mass loss of the rutting slabs made of three different asphalts at 10min, 20min, 30min, and 40min respectively. The results are shown in Table 2 and Figure 4 shown.

[0063] Table 2 AC-13 mixture mass loss

[0064]

[0065] From Table 2 and Figure 4 It can be seen that the growth rate of AC-13 asphalt mixture at 0.7MPa and 60°C increases with the increase of action time, and the loss of "twisting" action eventually slows down, and as the loss increases to...

Embodiment 3

[0067] From examples 1 and 2, we know that Karamay No. 90 asphalt has the best performance in the test, and its loose loss is the smallest. We use Karamay No. 90 asphalt to configure three kinds of asphalt mixtures: AC-13, OGFC-13 and SMA-13. Make rut plate specimens by rolling method (no less than 12 specimens for one gradation, no less than 4 specimens for each group, do parallel test) for standby, set time for 40min, temperature at 40°C, under pressure See Table 3 and Figure 5 :

[0068] Table 3 Loose loss mass of different types of asphalt mixtures under different pressures

[0069]

[0070] From Table 3 and Figure 5 It can be seen that in the "twisting" action, the tire exerts a torque on the asphalt pavement through friction, so the magnitude of the pressure is directly related to the magnitude of the "twisting" force. Through the above analysis of the influence of the pressure on the test results, the pressure can be obtained Small, the "twisting" force is insuf...

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Abstract

The invention relates to a device for detecting road surface damage caused by twisting and rubbing, and a measuring method thereof. A horizontal twisting device, the twisting device is circular and its diameter is equal to the equivalent circle diameter of a standard vehicle tire; the twisting device is connected with a hydraulic device for driving the twisting device to apply load to the test piece, and the twisting device is also connected It is connected with a connecting rod part for driving it to reciprocate on the test piece when it compresses the test piece. The present invention uses a hydraulic device to make the twisting device act on a load on the test piece, and then uses the twisting device to reciprocate and rotate in situ to rub the upper surface of the test piece, provide twisting torque, and simulate the impact of the actual tire on the asphalt road surface damage, the measurement results are stable, and the distinction degree of loose loss of different asphalt mixtures is large, which is beneficial to evaluate the damage status of asphalt pavement under the action of twisting and rubbing.

Description

【Technical field】 [0001] The invention belongs to the technical field of asphalt pavement mechanics experiments, and in particular relates to a device for detecting road surface damage caused by twisting and rubbing and a measuring method thereof. 【Background technique】 [0002] Nowadays, my country's asphalt pavement is mainly used in important road sections, such as expressways, first-class highways, urban roads, etc., and the frequent diseases of asphalt pavement have also attracted widespread attention. "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTGE20-2011) has clear test methods, procedures and indicators for high-temperature rutting, low-temperature cracking, water damage, fatigue characteristics and anti-aging performance of asphalt pavement. However, insufficient attention has been paid to the damage of asphalt pavement under the action of vehicle twisting, such as potholes, looseness, and grain loss. [0003] Traditionally, we unde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/34
Inventor 张宜洛王涛张轲段周洋王福满闫怀宇刘彦珍奚龙飞赵少宗杨自广郭科李晨
Owner CHANGAN UNIV
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