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Method for determining gelling point of emulsified asphalt

A technology of emulsified asphalt and gel point, applied in the investigation phase/state change and other directions, can solve the problems of long time consumption, large human error, inability to identify the demulsification speed, etc., and achieve the effect of simple test method and accurate test results.

Pending Publication Date: 2020-12-11
SHANDONG TRANSPORTATION INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The method for evaluating the storage stability of emulsified asphalt specified in JTG E20-2011 "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" takes a long time, and in the process of obtaining evaporation residues, human errors are large, so a convenient method is needed A fast and less error-prone method to compare the storage stability of different emulsified asphalt
JTG E20-2011 "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" also stipulates a method for evaluating the breaking speed of emulsified asphalt, but this method can only identify the category of fast cracking or slow cracking of emulsified asphalt samples. Large categories of different emulsified asphalt samples, unable to identify the speed of their demulsification

Method used

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  • Method for determining gelling point of emulsified asphalt
  • Method for determining gelling point of emulsified asphalt
  • Method for determining gelling point of emulsified asphalt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 【Test raw material】

[0027] Fresh cationic emulsified asphalt A.

[0028] 【Test steps】

[0029] S1. A stress sweep test was performed on the emulsified asphalt sample A with a dynamic shear rheometer.

[0030] The stress scanning test uses a 25mm flat plate, the test temperature is 25°C, the frequency is 1HZ, and the stress variation range is 0.01-10Pa.

[0031] To draw a G*--stress diagram, see figure 1 , G* is reduced from the initial value to 90% of the original value, and the stress range interval is the linear viscoelastic region, that is, the vibration stress is in the range of 0.04-0.13Pa.

[0032] S2. According to the linear viscoelastic interval, select the stress value of the temperature scanning test as 0.1Pa. The emulsified asphalt sample A was subjected to a temperature sweep test with a dynamic shear rheometer.

[0033] In the temperature scanning test, a 25mm flat plate is used, the test frequency is 1HZ, the test temperature range is 25°C-60°C, the...

Embodiment 2

[0037] The test raw materials and test procedures are the same as those in Example 1, except that the stresses of the temperature scanning test selected in step S2 are 0.08Pa and 0.05Pa.

[0038] The gelation points of emulsified asphalt A obtained under different stresses are:

[0039] 0.1Pa 0.08Pa 0.05Pa gel point 30.5 30.3 30.3

[0040] It can be seen that the gel point of the emulsified asphalt A obtained under different temperature scanning stresses is basically the same, and the test method is stable and reliable.

Embodiment 3

[0042] 【Test raw material】

[0043] Fresh cationic emulsified bitumen B.

[0044] 【Test steps】

[0045] S1. A stress sweep test was performed on the emulsified asphalt sample B with a dynamic shear rheometer.

[0046] The stress scanning test uses a 25mm flat plate, the test temperature is 25°C, the frequency is 1HZ, and the stress variation range is 0.04-10Pa.

[0047] To draw a G*--stress diagram, see image 3 , G* is reduced from the initial value to 90% of the original value, and the stress range is the linear viscoelastic region, that is, the vibration stress is in the range of 0.04-0.17Pa.

[0048] S2. According to the linear viscoelastic interval, select the stress value of the temperature scanning test as 0.1Pa. The emulsified asphalt sample B was subjected to a temperature sweep test with a dynamic shear rheometer.

[0049] In the temperature scanning test, a 25mm flat plate is used, the test frequency is 1HZ, the test temperature range is 25°C-60°C, the heating ...

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Abstract

The invention discloses a method for measuring the gelling point of emulsified asphalt, and belongs to the field of road engineering. The method is characterized in that the temperature correspondingto the condition that the elastic modulus of the emulsified asphalt is equal to the viscous modulus or the temperature when the tangent value of the phase angle is equal to 1 is taken as the gelling point. Compared with the prior art, the method has the advantages that the storage stability and demulsification speed of different emulsified asphalt can be conveniently and quickly identified by calculating the gelling point, and the method has good popularization and application values.

Description

technical field [0001] The invention relates to the field of road engineering, and specifically provides a method for measuring the gelation point of emulsified asphalt. Background technique [0002] In road engineering, emulsified asphalt is widely used in road surfaces of different grades, including maintenance projects and new construction projects of highways, first-class and other lower-grade roads. Fog seal, sand mist seal, slurry seal, micro-surface, super-surface and Capeton seal cement; can be used in cold mixing, cold patching, cold regeneration; can also be used for Soil stabilization, penetration layer, base stabilization, protective layer, pit filling, crack filling, sticky layer, penetrating type, dustproof agent, etc. Emulsified asphalt is widely used, and different road surface treatment technologies have different requirements on the performance of emulsified asphalt. When emulsified asphalt is applied in micro-surfacing, its demulsification speed is requi...

Claims

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Application Information

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IPC IPC(8): G01N25/06G01N25/12
CPCG01N25/12
Inventor 魏慧樊亮马士杰林江涛李永振姜峰毕飞梁皓周圣杰张岩侯佳林
Owner SHANDONG TRANSPORTATION INST
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