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Modified asphalt segregation evaluation method based on quantitative analysis of modifier content by potentiometric titration

A technology of modified asphalt and potentiometric titration, which is applied in the direction of material electrochemical variables, etc., can solve the problems of low correlation coefficient and low detection accuracy, and achieve the effect of accurate evaluation

Active Publication Date: 2017-11-07
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Infrared spectroscopy (FTIR) is the only method to quantitatively evaluate the phase separation of polymer-modified asphalt by detecting the polymer content of SBS. However, due to the low correlation coefficient between its infrared absorption coefficient and separation parameters (only 0.91), This makes the detection accuracy of the method not high

Method used

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  • Modified asphalt segregation evaluation method based on quantitative analysis of modifier content by potentiometric titration
  • Modified asphalt segregation evaluation method based on quantitative analysis of modifier content by potentiometric titration
  • Modified asphalt segregation evaluation method based on quantitative analysis of modifier content by potentiometric titration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] Three sets of modified asphalt samples A, B, and C with 4.5% SBS content were provided by a well-known company. Samples A and B have the same formula but different processes. They correspond to standard curve 1, and sample C corresponds to standard curve 2. In order to further verify the feasibility of the present invention, carry out 6,24,48,72,120h heat storage test respectively to sample, concrete test procedure is as follows:

[0085] (1) Thermal storage test of SBS modified asphalt samples A, B, and C

[0086] 1. Heat the SBS modified asphalt sample to be tested, stir and inject 50g of the asphalt sample into the standard separation tube;

[0087] 2. Seal the separation tube, then put it in an oven at 163±5°C, and let it stand for 6, 24, 48, 72, 120 hours;

[0088] 3. After heating, take out the separation tube containing the bitumen sample, keep the separation tube upright and place it in the refrigerator to cool until the bitumen is completely solidified;

[00...

Embodiment 2

[0116] In step 2 ii), add 10 mL of Webster's reagent with a concentration of 0.01M to the solution, and react at 30°C for 24 hours; Sodium thiosulfate solution titrates the solution after the above-mentioned ii) step treatment; other processes are the same as in Example 1.

Embodiment 3

[0118] In step two ii), add 30 mL of Webster's reagent with a concentration of 1M to the solution, and react at 50° C. for 8 hours; then add 30 mL of potassium iodide solution with a concentration of 1000 g / L respectively, and react for 60 minutes; iii) use sulfur with a concentration of 2M Sodium sulfite solution titrates the solution after the above-mentioned ii) step treatment; other processes are the same as in Example 1.

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Abstract

The invention discloses a modified asphalt segregation evaluation method based on potentiometric titration quantitative analysis of the amount of modifier. Firstly, the samples to be inspected are subjected to heat storage tests of segregation tubes at different times, and one-third of the top and bottom samples are taken. Put them into the sample boxes respectively and wait for detection; use the potentiometric titration method to accurately determine the amount of the modifier at the top and bottom of the above-mentioned segregation tube; The degree a value can be used to accurately and quantitatively evaluate the segregation degree of modified asphalt samples. This method can quickly and accurately evaluate the segregation of modified asphalt, and use the potentiometric titration method to accurately determine the amount of modifier in the top and bottom asphalt after the heat storage experiment, and directly characterize the segregation degree of the modified asphalt in essence.

Description

technical field [0001] The invention belongs to the technical field of road surface construction, and relates to a modified asphalt segregation evaluation method based on potentiometric titration quantitative analysis of modifier content. Background technique [0002] With the rapid development of highway construction in my country in recent years, polymer modified asphalt has been widely used in road construction due to its excellent performance. Polymer modified asphalt is to disperse some polymers (such as SBS, SBR, PE, EVA, etc.) Chemical properties are used to make up for the defects of asphalt itself, thereby improving the road performance of asphalt materials, and improving the service level and service life of asphalt pavement. Due to its excellent performance, polymer modified asphalt has been widely used at home and abroad in recent years. However, due to the large differences in density, relative molecular mass, polarity, and solubility parameters between the ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/42
Inventor 刘正春牛艳芳朱自强梁波
Owner CENT SOUTH UNIV
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