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Method for detecting residual trichloroethylene in recycled asphalt by adopting FTIR

A technology of trichlorethylene and recycled asphalt, which is applied in the direction of measuring devices, material analysis through optical means, instruments, etc., can solve the problems of inaccurate evaluation of the aging degree of old asphalt, affect the purity of recycled asphalt, and it is not easy to achieve detection results Intuitive, true and reliable, easy to grasp the effect of application and promotion, avoiding human error

Inactive Publication Date: 2018-06-15
JIANGSU SINOROAD ENG TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is not easy to completely evaporate trichlorethylene from the mixed solution of trichlorethylene and old asphalt, and at present, it is very rough to judge whether the evaporation is complete by observing whether there is condensation and recovery of trichlorethylene with the naked eye of the experimenter, which often results in obtaining Trichlorethylene remains in the recycled asphalt, which affects the purity of the recycled asphalt and leads to inaccurate evaluation of the aging degree of the old asphalt

Method used

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  • Method for detecting residual trichloroethylene in recycled asphalt by adopting FTIR
  • Method for detecting residual trichloroethylene in recycled asphalt by adopting FTIR
  • Method for detecting residual trichloroethylene in recycled asphalt by adopting FTIR

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Embodiment 1

[0048] A kind of method adopting FTIR detection of the present invention to recover residual trichlorethylene in asphalt comprises the following steps:

[0049](1) Use FTIR equipment to detect pure trichlorethylene at a test wave number of 600-4000cm -1 Absorbance within the range, calibrate the wavenumber position where the absorbance of trichlorethylene presents an obvious peak, the results are shown in figure 1 .

[0050] In trichlorethylene, due to the out-of-plane bending vibration of the -C-H chemical bond and the stretching vibration of the -C-Cl chemical bond, the FTIR detection result is at a wavenumber of 836cm -1 、928cm -1 There is a distinct absorbance peak.

[0051] (2) Use FTIR equipment to detect the original asphalt at a test wave number of 600-4000cm -1 The absorbance within the range, the wavenumber position where the asphalt absorbance presents an obvious peak. The original asphalt adopts SBS modified asphalt, the performance index test results are show...

Embodiment 2

[0070] A kind of method adopting FTIR detection of the present invention to recover residual trichlorethylene in asphalt comprises the following steps:

[0071] (1) Use FTIR equipment to detect pure trichlorethylene at a test wave number of 600-4000cm -1 Absorbance within the range, calibrate the wavenumber position where the absorbance of trichlorethylene presents an obvious peak, the results are shown in Figure 6 .

[0072] In trichlorethylene, due to the out-of-plane bending vibration of the -C-H chemical bond and the stretching vibration of the -C-Cl chemical bond, the FTIR detection result is at a wavenumber of 836cm -1 、928cm -1 There is a distinct absorbance peak.

[0073] (2) Use FTIR equipment to detect the original asphalt at a test wave number of 600-4000cm -1 The absorbance within the range, the wavenumber position where the asphalt absorbance presents an obvious peak. The original asphalt adopts SBS modified asphalt, the performance index test results are sh...

Embodiment 3

[0091] A kind of method adopting FTIR detection of the present invention to recover residual trichlorethylene in asphalt comprises the following steps:

[0092] (1) Use FTIR equipment to detect pure trichlorethylene at a test wave number of 600-4000cm -1 Absorbance within the range, calibrate the wavenumber position where the absorbance of trichlorethylene presents an obvious peak, the results are shown in Figure 11 .

[0093] In trichlorethylene, due to the out-of-plane bending vibration of the -C-H chemical bond and the stretching vibration of the -C-Cl chemical bond, the FTIR detection result is at a wavenumber of 836cm -1 、928cm -1 There is a distinct absorbance peak.

[0094] (2) Use FTIR equipment to detect the original asphalt at a test wave number of 600-4000cm -1 The absorbance within the range, the wavenumber position where the asphalt absorbance presents an obvious peak. The original asphalt adopts SBS modified asphalt, the performance index test results are s...

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Abstract

The invention provides a method for detecting residual trichloroethylene in recovered asphalt by adopting FTIR (Fourier transform infrared spectroscopy). The method comprises the following steps: (1)detecting pure trichloroethylene by adopting an FTIR device, and calibrating the position of the absorbance peak of the pure trichloroethylene; (2) detecting original asphalt by adopting the FTIR device, and calibrating the position of the absorbance peak of the original asphalt; (3) comparing the position obtained in step (1) with the position obtained in step (2) to determine the wave number position of trichloroethylene in the detected asphalt; (4) mixing the original asphalt in the step (2), aggregates and mineral powder to form an asphalt mixture; (5) obtaining the recovered asphalt fromthe asphalt mixture obtained in step (4) by adopting a rotary evaporator technology; (6) detecting the absorbance of the recovered asphalt obtained in step (5) by adopting the FTIR device; and (7) comparing the absorbance of the original asphalt in the step (2) with the absorbance of the recycled asphalt in step (6) to determine whether a difference exists at the wave number position determined inthe step (3) or not, and judging that the trichloroethylene is remained in the recycled asphalt when the difference exists. The detection method of the invention has an intuitive, real and reliable detection result and effectively avoids personal errors.

Description

technical field [0001] The invention relates to a method for recovering and testing materials used in road engineering, in particular to a method for detecting residual trichlorethylene in recovered asphalt by using FTIR. Background technique [0002] Asphalt pavement regeneration technology has been more and more widely used in the maintenance and repair of highway asphalt pavement in my country because of its advantages of resource utilization of old asphalt pavement materials, saving precious resources such as stone and asphalt, protecting the environment, and reducing investment costs. The key to asphalt pavement regeneration technology is to accurately evaluate the aging degree of old asphalt, so as to guide the selection of new asphalt grades or regenerant types, to ensure that old asphalt is completely regenerated, and the remaining value of old asphalt pavement materials is fully utilized. In order to evaluate the aging degree of old asphalt, it is first necessary to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3563
CPCG01N21/3563
Inventor 邵慧君张万磊何文政吴倩
Owner JIANGSU SINOROAD ENG TECH RES INST CO LTD
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