Method for determining time-temperature equivalent relation of SBS modified asphalt

A method for determining and modifying asphalt technology, applied in the field of SBS modified asphalt application, can solve problems such as complex solution process

Inactive Publication Date: 2021-02-05
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can reliably determine the time-temperature equivalent quantity relationship of asphalt, the solution process is relatively complicated.

Method used

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  • Method for determining time-temperature equivalent relation of SBS modified asphalt
  • Method for determining time-temperature equivalent relation of SBS modified asphalt
  • Method for determining time-temperature equivalent relation of SBS modified asphalt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The base asphalt of SBS modified asphalt is 70# road petroleum asphalt, the SBS modifier is linear, and the dosage of SBS modifier is 4%.

[0044] Among them, the softening point of 70# road petroleum asphalt is 47.7°C, the penetration at 25°C is 63.8dmm; the S / B ratio of the linear SBS modifier is 30 / 70.

[0045] A method for determining the time-temperature equivalent relationship of SBS modified asphalt, comprising the following steps:

[0046] (1) Use a dynamic shear rheometer to conduct a temperature scanning test on SBS modified asphalt, in which the temperature scanning range is 20-90°C, the strain value is 1%, and the angular frequency is selected in turn from 1rad / s, 10rad / s, and 100rad / s, 200rad / s, 500rad / s, and then draw five corresponding phase angle-temperature curves according to the temperature scanning results at these five different angular frequencies, such as figure 1 ;

[0047] (2) According to figure 1The platform area in the SBS modified asphal...

Embodiment 2

[0052] The base asphalt of SBS modified asphalt is 70# road petroleum asphalt, the SBS modifier is linear, and the dosage of SBS modifier is 6%.

[0053] Among them, the softening point of 70# road petroleum asphalt is 47.7°C, the penetration at 25°C is 63.8dmm; the S / B ratio of the linear SBS modifier is 30 / 70.

[0054] A method for determining the time-temperature equivalent relationship of SBS modified asphalt, comprising the following steps:

[0055] (1) Use a dynamic shear rheometer to conduct a temperature scanning test on SBS modified asphalt. The temperature scanning range is 20-90°C, the strain value is 1%, and the angular frequency is selected 1rad / s, 10rad / s, and 100rad / s in turn. , 200rad / s, 500rad / s, and then draw five corresponding phase angle-temperature curves according to the temperature scanning results at these five different angular frequencies, such as image 3 ;

[0056] (2) According to image 3 The platform area in the SBS modified asphalt phase angl...

Embodiment 3

[0061] The base asphalt of SBS modified asphalt is 70# road petroleum asphalt, the SBS modifier is star-shaped, and the dosage of SBS modifier is 4%.

[0062] Among them, the softening point of 70# road petroleum asphalt is 47.7°C, the penetration at 25°C is 63.8dmm; the S / B ratio of star SBS modifier is 30 / 70. ,

[0063] A method for determining the time-temperature equivalent relationship of SBS modified asphalt, comprising the following steps:

[0064] (1) Use a dynamic shear rheometer to conduct a temperature scanning test on SBS modified asphalt, in which the temperature scanning range is 20-90°C, the strain value is 1%, and the angular frequency is selected in turn from 1rad / s, 10rad / s, and 100rad / s, 200rad / s, 500rad / s, and then draw five corresponding phase angle-temperature curves according to the temperature scanning results at these five different angular frequencies, such as Figure 5 ;

[0065] (2) According to Figure 5 The platform area in the SBS modified a...

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Abstract

The invention relates to a method for determining the time-temperature equivalent relation of SBS modified asphalt. The method comprises the following steps (1), using a dynamic shear rheometer for conducting a temperature scanning test on the SBS modified asphalt, and drawing a phase angle- temperature curve family according to temperature scanning results under different angular frequencies; (2), selecting a time-temperature condition corresponding to a fixed point at the position of a platform area according to the shape of the platform area in the phase angle- temperature curve family; (3), randomly selecting one group from the selected time-temperature conditions, taking the temperature of the selected group as a reference temperature, and calculating shift factors of other groups oftemperatures relative to the reference temperature of the selected group; and (4), substituting the calculated shift factor into a WLF equation in the form of logarithm, inversely calculating the parameters of the WLF equation, and calculating the shift factor of any temperature relative to the reference temperature of the selected group by using the solved WLF equation. According to the method, the time-temperature equivalent relation of the SBS modified asphalt can be simply, conveniently and reliably determined.

Description

technical field [0001] The invention relates to the application field of SBS modified asphalt, in particular to a method for determining the time-temperature equivalent relationship of SBS modified asphalt based on the position of the platform area of ​​the phase angle-temperature curve. Background technique [0002] Asphalt is a typical viscoelastic material, and its viscoelastic mechanical (rheological) behavior has a clear dependence on temperature and loading time, and the temperature effect and time effect are equivalent, and can be converted by quantitative relationship. However, the limitations of the technical conditions of the test device make the test dimension, including the time range and temperature range, limited. In actual engineering structures, asphalt is exposed to a much wider range of time and temperature conditions than the experimental setup allows. At present, the use of time-temperature equivalent conversion can extend the experimental measurement re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/20G01N3/24
CPCG01N3/24G01N25/20
Inventor 张恒龙陈子豪史才军朱崇政张帅段海辉
Owner HUNAN UNIV
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