An experimental method based on an asphalt aging simulator considering the influence of aggregate mineral properties
A technology of simulation device and experimental method, which is applied in the field of asphalt experiments, can solve the problems of misleading material comparison engineering design, secondary aging of asphalt, and damage to the original shape of asphalt, so as to achieve the effect of reliable experimental data and avoiding secondary aging
Active Publication Date: 2019-03-01
HOHAI UNIV
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Problems solved by technology
However, existing indoor simulation methods for asphalt aging considering the effect of aggregates (i.e., mixture aging methods) have large uncertainties
The main reason is that the influence of different aggregate gradation, porosity and other factors on the aging results cannot be eliminated
In addition, when it is necessary to test the road performance of the asphalt contained in the aged mixture, asphalt recycling is required, and the chemical extraction process in recycling not only destroys the original shape of the asphalt, but also causes secondary aging of the asphalt. The experimental results have a great influence, which is very easy to mislead the comparison of materials and subsequent engineering design
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Embodiment 1
[0029] The invention discloses an asphalt aging simulation device based on considering the influence of aggregate mineral properties, such as figure 1 As shown, the simulation device includes a constant temperature box 1, a specimen rack 2, an asphalt storage container 3, a motor 4, and a long axis 5; a motor 4 is arranged on one side of the constant temperature box 1, and one end of the long axis 5 is connected by a shaft. The part is connected with the rotating shaft of the motor 4, and the other end stretches into the cavity of the thermostat 1, and the specimen rack 2 is arranged in the thermostat 1, and the asphalt holding container 3 is placed on the specimen rack 2.
[0030] After the door is closed, the internal dimensions of the device are 480mm in length, 445±13mm in width (after closing the door), and 380mm in height. The rock core is a cylinder with a diameter of 100 mm and a height of 200 mm, with a square core at the bottom and bottom respectively. The cross sec...
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Abstract
The invention discloses an experimental method of an asphalt aging simulating device based on consideration of the influence of the mineralogical properties of aggregate, comprising the steps: drilling of a tested rock core, early preparation of test, and aging reaction of asphalt with the rock core in the simulating device. Compared with the current method of analyzing the asphalt properties by extracting the asphalt from an asphalt mixture, the experimental method avoids secondary aging of the asphalt, is simple and has more effective experimental results.
Description
technical field [0001] The invention belongs to the field of asphalt experimental methods, in particular to an experimental method based on an asphalt aging simulation device considering the influence of aggregate mineral properties. Background technique [0002] As the main cementing material of modern pavement, asphalt material can improve various performances of pavement. But its performance is affected by many factors, especially the aging of asphalt. Factors affecting asphalt aging include air oxidation, volatilization of light oil, aggregate absorption and adsorption and other factors. Aggregate is another important component of asphalt mixture, and its mineral properties are one of the key factors affecting asphalt aging. However, the existing indoor simulation method of asphalt aging considering the influence of aggregates (i.e., the mixture aging method) has great uncertainties. The main reason is that the influence of different aggregate gradation, porosity and ...
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IPC IPC(8): G01N33/42
CPCG01N33/42
Inventor 吴建涛杨滔杨帅刘泉
Owner HOHAI UNIV