Investigation into Shear Coefficient for Circle Shear Test Method of Asphalt Mixture

2012 ◽  
Vol 446-449 ◽  
pp. 2590-2594
Author(s):  
Tuo Huang ◽  
Guo Ping Qian ◽  
Jian Long Zheng
Keyword(s):  
Shear Strength ◽  
Shear Test ◽  
Standard Specimen ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Middle Surface ◽  
Test Method ◽  
Calibration Coefficient ◽  
Layer Surface ◽  
Standard Specimens

In order to efficiently evaluate the shear properties of asphalt mixture, the circle shear test method is proposed. However, the thickness of upper layer surface and the middle-surface of the asphalt pavement in China are usually less than the height of standard specimen in circle shear test, as well as some laboratory specimens. In order to determine the shear strength for samples at different height, the circle shear test is conducted to the specimens at different height, and the height calibration coefficient for non-standard specimens are proposed. With which the shear strength for samples at different height can be unified and easily determined.

Research on Shear Strength for Asphalt Mixture by the Uniaxle Penetration Test Method

2011 ◽  
Vol 97-98 ◽  
pp. 220-225 ◽  
Author(s):  
Yang Cai
Keyword(s):  
Shear Strength ◽  
High Temperature ◽  
Linear Correlation ◽  
Shear Test ◽  
Asphalt Mixture ◽  
Test Method ◽  
Penetration Test ◽  
Triaxial Shear Test ◽  
Different Temperatures ◽  
Penetration Tests

With uniaxle penetration test method and Triaxial Shear method test, the shear strengths for asphalt mixture were analyzed. It turns out that the result of triaxial shear test is a little conservative than that of uniaxle penetration test. Then reasonable structure factor for shear strength should be considered by uniaxle penetration test. Uniaxle penetration tests at different temperatures revealed there were a linear correlation between shear strength and temperature.The asphalt was not the main fator of shear strength at high temperature.

scholarly journals Analysis of a Methodology for Torsional Test under Normal Stress and Shear Performance for Asphalt Mixtures

2019 ◽  
Vol 2019 ◽  
pp. 1-14
Author(s):  
Jun Xie ◽  
Yiqun Zhan ◽  
Yifan Wang
Keyword(s):  
Shear Strength ◽  
Normal Stress ◽  
Shear Test ◽  
Stress Condition ◽  
Asphalt Mixture ◽  
Friction Angle ◽  
Asphalt Mixtures ◽  
Test Method ◽  
Shear Performance ◽  
Torsional Test

Insufficient shear performance in an asphalt mixture is a primary reason for rutting deformation and pavement surface longitudinal cracking. Thus, it is important to choose a suitable shear test method to evaluate shear performance in an asphalt mixture. Current testing methods mainly evaluate the bonding strength between asphalt layers, and the current shear test method for an asphalt mixture is disadvantaged by high equipment cost and complicated procedures. Our study proposes a torsional test method under normal stress condition, and evaluation was done for four types of asphalt mixture under different temperature conditions. Through the mechanical analysis, the calculation formulas for shear strength and shear parameters (cohesion and internal friction angle) for the torsional test under a normal stress condition were obtained. Testing results were also obtained for shear strength, shear modulus, and cohesion and internal friction angle of the asphalt mixtures. Experimental testing indicated that the method was able to provide repeatable results for the shear resistance of asphalt mixtures at different temperatures and also reflected the difference in shear performance of the various asphalt mixtures and the influence of temperature on shear performance. The failure mode of the specimen was the appearance of an oblique crack of about 45° from the vertical axis after the specimen was destroyed, which accorded with shear failure characteristics. A shear fatigue model was obtained considering different shear stress levels. The torsional test method under normal stress formed a compression-shear action on the specimen by applying torque and normal stress and was used to evaluate the shear performance of the asphalt mixtures.

Investigation into Shear Coefficient for Circle Shear Test Method of Asphalt Mixture

2012 ◽  
Vol 446-449 ◽  
pp. 2590-2594
Author(s):  
Tuo Huang ◽  
Guo Ping Qian ◽  
Jian Long Zheng
Keyword(s):  
Shear Test ◽  
Asphalt Mixture ◽  
Test Method ◽  
Shear Coefficient

scholarly journals Development of a Full-Depth Wheel Tracking Test for Asphalt Pavement Structure: Methods and Performance Evaluation

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Hui Wang ◽  
Zepeng Fan ◽  
Jiupeng Zhang
Keyword(s):  
Performance Evaluation ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Single Layer ◽  
Test Method ◽  
Shanxi Province ◽  
Wheel Tracking Test ◽  
Pavement Structure ◽  
Pavement Structures ◽  
Wheel Tracking

The rutting performance of asphalt pavement structure relies on the high temperature properties of asphalt mixture as well as the pavement structure and thickness. In order to investigate the influence of the structure and thickness, a full-depth wheel tracking test is developed in this research by improving the conventional wheel tracking test apparatus. The newly proposed test method is capable of varying its load speed and load size, controlling its specimen temperature gradient, and simulating the support conditions of actual asphalt pavement. The full-depth wheel tracking test based rutting performance evaluation of different asphalt pavement structures indicates that it is not reasonable to explain the rutting performance of asphalt pavement structure from the point of view of single-layer asphalt mixture rutting performance. The developed full-depth wheel tracking test can be used to distinguish rutting performance of different asphalt pavement structures, and two of five typical asphalt pavement structures commonly used in Shanxi Province were suggested for use in practical engineering.

Summary of the New Rutting Tests of China

2012 ◽  
Vol 193-194 ◽  
pp. 905-909
Author(s):  
Hao Liu ◽  
Hong Xin Guan ◽  
Zeng Jie Luo
Keyword(s):  
Working Condition ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Test Methods ◽  
Test Method ◽  
Asphalt Pavements ◽  
Simulation Test ◽  
Engineering Applications ◽  
Basic Principles ◽  
Development Direction

The asphalt pavement is the mainstream pavement structure of the expressway in our country. But it is investigated that rutting disease appeared even though the asphalt mixture was test qualified. With this instruction, the standard rutting test method has difficult in satisfying the complex working condition of asphalt pavement. In order to solve these, some new rutting test methods which are in accordance with privileged conditions have been proposed from theory and simulation test by many scholars’ deeper research, including lots of feasible methods. By summarized the new anti-rutting methods of asphalt pavements and described all kinds of basic principles and engineering applications, the deficiency of the new rutting test methods was pointed out and the development direction was proposed.

A New Method to Measure the Gross Volume Density of the Asphalt Mixture Specimen - Brush Wax Method

2014 ◽  
Vol 505-506 ◽  
pp. 154-162
Author(s):  
Long Shi Peng ◽  
Min Gong ◽  
Lan Qiao
Keyword(s):  
Quality Control ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Volume Density ◽  
Test Method ◽  
The Other ◽  
New Method ◽  
Practical Significance ◽  
Technical Requirements

The gross volume density of mix asphalt material compacted specimen is a crucial indicator in the design of asphalt mixture and quality control of asphalt pavement, and it directly determines the asphalt aggregate ratio and the degree of compaction. It has a great practical significance to distinguish and choose the test method of gross volume density correctly. The specific aspects of the methods to determine gross volume density have been controversial. A new method named brush wax method is put forward for these issues. The density, priority, VMA and compactness of asphalt mixture were measured by different methods in the tests. By comparison of the new method and the other methods, the main technical indexes of asphalt mixture obtained by the brush wax method are the only one which greatly satisfies the technical requirements.

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