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Method for testing surface tension and wettability parameters of high-temperature liquid asphalt

A technology of surface tension and liquid asphalt, applied in surface tension analysis, surface/boundary effects, measurement devices, etc., can solve the problems of high cost of test equipment, large influence of experimental results, and error of inner radius measurement value, etc., and achieve the test cost. The effect of low, strong operability, and improved precision

Active Publication Date: 2020-07-03
SHANGHAI MARITIME UNIVERSITY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When the traditional capillary method measures the rising height of asphalt, the measurement error occurs due to the infiltration of the liquid on the outer wall of the capillary, which has a great influence on the experimental results.
Both the traditional capillary method and the traditional differential capillary method ignore the contact angle between the liquid in the capillary and the capillary wall, and there is a certain error in the measurement of the inner radius, which has a great influence on the experimental results
The test of the pendant drop method needs to meet the surface tension and gravity equilibrium state. For asphalt, a high-viscosity liquid, it takes a long time to reach the equilibrium state. In addition, it is difficult to obtain an accurate image profile due to the lack of criteria for judging the equilibrium state; and the asphalt pendant drop The adhesion of the part in contact with the needle is difficult to determine, and the size of the needle is difficult to determine the scope of application of asphalt; the cost of the pendant drop test instrument is relatively high, and domestically produced instruments are generally not less than 50,000 yuan
The contact angle measurement is relatively common, but most asphalt contact angle tests are carried out under low temperature conditions, and the contact angle measurement under high temperature conditions requires strict control of the test temperature and the size of the imaging droplet during operation. For asphalt, the The test conditions of the method are relatively strict, and the cost of test equipment is relatively high

Method used

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  • Method for testing surface tension and wettability parameters of high-temperature liquid asphalt
  • Method for testing surface tension and wettability parameters of high-temperature liquid asphalt
  • Method for testing surface tension and wettability parameters of high-temperature liquid asphalt

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Experimental program
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Effect test

Embodiment 1

[0050] Such as figure 1 The test procedures for the surface tension and wettability parameters of the bitumen shown are further detailed through the test steps and test results of the surface tension and wettability parameters of No. 70 base asphalt at 135°C:

[0051] Step 1. Select 6 groups of homogeneous and different-diameter capillaries, among which the production labels of the inner radius of the capillary selected from 1 to 5 groups are: 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.5mm, and the sixth group is used as the inner radius calibration Reference pipe, the inner radius of the capillary is 1.0mm;

[0052] Step 2: Use absolute ethanol to clean and dry the capillary, and use the "compensation method" to immerse the capillary in absolute ethanol (the size of the liquid surface is 245mm×50mm, and the capillary is parallel to the long The position of the center line of the liquid surface on the side), until the liquid in the tube rises and stabilizes, each group screens out capil...

Embodiment 2

[0068] According to the scheme proposed in the present invention, according to the steps in Example 1, No. 70 base asphalt and No. 70 warm-mix asphalt (test temperature: 135 ° C), SBS modified asphalt and SBS modified warm-mix asphalt (test temperature: 165 °C) to test the surface tension and wettability parameters, the test results are shown in Table 4.

[0069] Table 4 Test results of surface tension and wettability parameters

[0070]

[0071]

[0072] According to the working principle of surfactants, within a certain dosage range, with the increase of the dosage of warm mix agent, the surface tension of surface active warm mix asphalt will gradually decrease, and the wettability will increase. It can be seen from Table 4 that after adding warm mix agent, the surface tension of asphalt decreases, and the wettability parameters increase, and with the increase of warm mix agent content, the surface tension of asphalt shows a significant decline trend, and the wettabili...

Embodiment 3

[0074] According to the solution proposed by the present invention, the surface tension precision is increased by about 26% to 54%. Combining with the traditional differential capillary method, the improvement of the surface tension precision of the present invention will be further described in detail. Using the scheme proposed by the present invention and the traditional differential capillary method respectively, test according to the steps in Example 1, test No. 70 base asphalt and No. 70 warm mix asphalt, SBS modified asphalt and SBS modified warm mix asphalt, test The results are shown in Table 5. Among them, the traditional differential capillary method test ignores the inner radius reverse calibration process and the impact of the contact angle on the test results, so the inner radius takes the value given by the production label, referring to the method of the Hunan Academy of Communications, and the inner radius is selected with a difference of 2 The capillary differ...

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Abstract

The invention discloses a method for testing surface tension and wettability parameters of high-temperature liquid asphalt, which comprises the steps of firstly, reversely calculating the inner radiusof a capillary tube by taking absolute ethyl alcohol as calibration liquid; secondly, obtaining a surface tension calculation value of the asphalt through a differential capillary tube method; and finally, fitting the arithmetic square root of the inner radius product with the natural logarithm value of the surface tension calculation value by using a linear function, and respectively representing the surface tension and wettability of the asphalt by using fitting parameters [gamma]0 and [beta]. According to the method, the differential capillary tube method is perfected, the surface tensiontest precision is improved by about 26%-54%, the wettability of the high-temperature liquid asphalt can be evaluated, and the method has certain theoretical significance and practical value.

Description

technical field [0001] The invention belongs to the field of road engineering and relates to a method for testing the surface tension and wettability parameters of high-temperature liquid asphalt. Background technique [0002] The surface tension and wettability of high-temperature liquid asphalt are important parameters for studying the properties of asphalt materials. High-temperature surface tension and wettability can provide a reference for determining the construction temperature of asphalt mixture. [0003] Existing methods for testing asphalt surface tension under high temperature conditions include capillary method, differential capillary method, and pendant drop method; existing methods for testing asphalt wettability under high temperature conditions include contact angle method. [0004] When the traditional capillary method measures the rising height of the asphalt, the measurement error occurs due to the infiltration of the liquid on the outer wall of the capi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/02G01N13/00
CPCG01N13/02G01N13/00G01N2013/0208G01N2013/0283Y02A30/30
Inventor 耿韩程格格叶思雁
Owner SHANGHAI MARITIME UNIVERSITY
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