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Method for testing residual intensity of bituminous mixture

A technology of asphalt mixture and testing method, which is applied in the direction of applying repeated force/pulsation force to test the strength of materials, etc., and can solve problems such as accelerated damage of pavement

Inactive Publication Date: 2018-10-23
SOUTHEAST UNIV
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Problems solved by technology

The current pavement design method is based on the strength of the non-damaged asphalt mixture material. With the increase of the service life of the pavement, the remaining strength of the pavement material will gradually decrease, and the pavement may exceed the bearing capacity of the structure within the design load range, resulting in pavement acceleration. phenomenon of destruction

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  • Method for testing residual intensity of bituminous mixture
  • Method for testing residual intensity of bituminous mixture
  • Method for testing residual intensity of bituminous mixture

Examples

Experimental program
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Embodiment 1

[0025] Embodiment 1: as figure 1 As shown, a method for decay law of residual strength of asphalt mixture includes the following steps:

[0026] 1) Prepare matrix 70# asphalt AC-20 mixture according to T 0739-2011 four-point bending fatigue life test requirements of asphalt mixture in JTG E20-2011 highway engineering asphalt and asphalt mixture test regulations. The test temperature was 15°C, the loading frequency was 10 Hz, the controlled strain loading mode was adopted, and the loading level was 800 με. Carry out the first set of fatigue tests to obtain the fatigue life N of the current mixture f = 2400 times.

[0027] The fatigue damage of the material is characterized by the stiffness of the specimen, which takes the following form:

[0028]

[0029] In the formula: D is the fatigue damage variable characterized by stiffness, E i is the stiffness of the specimen when it is loaded in the i-th cycle, E 0 is the initial stiffness of the specimen before loading.

[00...

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Abstract

The invention discloses a method for testing the residual intensity of a bituminous mixture. The method comprises following steps: (1) preparing a bituminous mixture test piece, carrying out a fatiguetest, and determining a fatigue developing rule; (2) carrying out another fatigue test, and stopping loading on the test piece before the test piece is broken; (3) immediately carrying out a tensilestrength test on the test piece after the loading is stopped; (4) repeating steps (2) and (3) to determine the tensile strength of the bituminous mixture under different fatigue levels; and (5) fitting the residual intensities under different fatigue states to obtain the relationship between residual intensity and fatigue damage. According to the method, fatigue tests and tensile strength tests are carried out at the same time to determine the deterioration law of the ultimate tensile strength of a bituminous mixture in different fatigue phases along with the fatigue damage of the bituminous mixture; and the method has an important meaning for the pavement design and traffic control scheme establishment in the full service life of a pavement.

Description

technical field [0001] The invention relates to the technical field of road engineering, in particular to a method for testing the residual strength of asphalt mixture. Background technique [0002] Asphalt pavement has the characteristics of smooth road surface, low noise, short construction period, and convenient maintenance in the later stage, so it has been widely used in road engineering. With the maturity of asphalt mixture and pavement construction technology, early failure forms such as loose mixture and roadbed subsidence have become less and less. Instead, long-term diseases such as fatigue have gradually become the main factors affecting the service life of asphalt pavement. [0003] The fatigue development of asphalt mixture is accompanied by the deterioration of various mechanical properties of the material. With the fatigue development of the material, the ultimate bearing capacity of the material will gradually decrease. The current pavement design method is...

Claims

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Application Information

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IPC IPC(8): G01N3/32
CPCG01N3/32
Inventor 马涛童巨声丁珣昊陈田张垚林子豪
Owner SOUTHEAST UNIV
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