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Transition temperature method for detecting aggregative state of asphalt with ultraviolet aging

A technology of transformation temperature and aggregation state, used in thermometers, thermometers, measuring devices, etc. with physical/chemical changes, it can solve the problems of high cost, complicated detection methods, and complicated operation of expansion measurement methods, and achieve the effect of simple operation.

Inactive Publication Date: 2009-11-04
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the problem of the complex operation of dilation measurement method in the existing method for detecting the aggregation state conversion performance of asphalt after ultraviolet aging, the complicated measurement equipment, high cost and complicated detection method of differential thermal analysis method, which cannot realize online detection, and the differential thermal analysis method. The method of dynamic mechanics does not conform to the principle of time-temperature equivalence, but it provides a method for detecting the transformation temperature of asphalt aggregates after ultraviolet aging

Method used

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  • Transition temperature method for detecting aggregative state of asphalt with ultraviolet aging
  • Transition temperature method for detecting aggregative state of asphalt with ultraviolet aging
  • Transition temperature method for detecting aggregative state of asphalt with ultraviolet aging

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specific Embodiment approach 1

[0011]Specific embodiment one: the method for detecting the aggregated state conversion temperature of asphalt after ultraviolet aging in this embodiment is carried out according to the following steps: one, the asphalt to be detected is heated to a glue state and placed on parallel plates, and the thickness of the asphalt on the parallel plates is 1000μm~2000μm, with 5℃ as the starting temperature, scan the asphalt on the parallel plate at a frequency of 0.1~10Hz, and then scan the asphalt at a frequency of 0.1~10Hz at every interval of n℃, where 0<n≤10, Carry out the last frequency scan until the temperature of the asphalt reaches 63-67°C, draw the composite modulus curves at different temperatures according to the corresponding relationship between the angular frequency and the composite modulus obtained from the scan, where the composite modulus curve is drawn with the angular frequency as the abscissa, Take the composite modulus as the ordinate; 2. Perform time-temperature...

specific Embodiment approach 2

[0015] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in step 1, the asphalt to be tested is heated to a glue state and placed on parallel plates, and the thickness of the asphalt on the parallel plates is 1000 μm. Other steps and parameters are the same as those in Embodiment 1.

[0016] The diameter of the circular parallel plates in this embodiment is 25mm.

specific Embodiment approach 3

[0017] Embodiment 3: The difference between this embodiment and Embodiment 1 is that in step 1, the asphalt to be tested is heated until it is glued and placed on parallel plates, and the thickness of the asphalt on the parallel plates is 2000 μm. Other steps and parameters are the same as those in Embodiment 1.

[0018] The diameter of the circular parallel plates in this embodiment is 8mm.

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Abstract

The invention provides a transition temperature method for detecting the aggregative state of asphalt with ultraviolet aging, which relates to a transition temperature method for detecting the aggregative state of the asphalt with the ultraviolet aging. The invention overcomes the defects that the existing transition method for detecting the aggregative state of the asphalt with the ultraviolet aging has complicated operation, high cost and disagreement with time-temperature equivalence principle. The transition performance method for the aggregative state of the asphalt with the ultraviolet aging is proceeded as the following steps: 1. frequency scanning is carried out, and the frequency scanning is carried out again after temperature rise or temperature drop; 2. the principal curve of the frequency scanning is obtained; 3. the time-temperature equivalent invalidation temperature of the aging asphalt is found out, and the temperature is the aggregative state transition temperature of the asphalt with the ultraviolet aging. The method has simple operation, low cost and conformity with time-temperature equivalence principle.

Description

technical field [0001] The invention relates to a method for detecting the transformation temperature of aggregated state after asphalt aging. Background technique [0002] There are three main methods for detecting the transition temperature of asphalt aggregates after UV aging: 1. Dilatometry (DTA), which is a classic measurement method, using appropriate techniques to determine the relationship between mass volume and temperature during cooling , take the temperature when the slope of the curve changes as T g , in practice, put T on the curve g The intersection point of the two straight lines below and above is taken as T g , the slope is related to the volumetric thermal expansion coefficient a, which at T g There is discontinuity at the place, the principle of this method is very simple, but it is very complicated to do, the most commonly used method is the discharge method, which measures the amount of fluid that acts as a seal discharged from the polymer, and calcu...

Claims

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Application Information

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IPC IPC(8): G01K11/00
Inventor 王佳妮谭忆秋薛忠军侯明昊
Owner HARBIN INST OF TECH
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