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Detection analysis method for asphalt volatile organic compound

A volatile organic compound and analysis method technology, which is applied in the field of thermal analysis and detection, can solve the problems of increasing the difficulty of detection and analysis of asphalt volatiles due to variability and detection technology, the complex composition of asphalt smoke, and the evaluation of asphalt volatilization ability and degree of volatilization.

Inactive Publication Date: 2014-07-02
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Due to the diversity of asphalt types and sources, the components of asphalt fume produced are also relatively complex, so there is no specified analysis method for asphalt volatiles, and there is no unified standard specification to evaluate the volatilization ability and degree of asphalt
At the same time, the variability of environmental factors and the limitation of detection technology also increase the difficulty of detection and analysis of asphalt volatiles

Method used

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  • Detection analysis method for asphalt volatile organic compound
  • Detection analysis method for asphalt volatile organic compound
  • Detection analysis method for asphalt volatile organic compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Select PJ90 base asphalt and 5-10 mg of PJ90 modified asphalt with 3% activated carbon, control the heating rate at 10°C / min, heat from room temperature to 250°C for thermogravimetric mass spectrometry analysis. Mass spectrometry analysis was performed directly on the volatile gas during the heating process, and the volatilization of asphalt VOC was evaluated by the amount of mass loss.

[0029] Refer to attached figure 1 , the results show that under the same conditions, the mass loss rate of base asphalt is 3.54%, while after adding 3% activated carbon, the mass loss rate is only 2.45%. By comparison, it can be found that the inhibitory effect of activated carbon on asphalt is obvious. Through the thermogravimetric method, the volatilization of asphalt during use can be quantitatively analyzed, and the inhibitor's inhibitory effect on asphalt can also be evaluated by comparative analysis.

Embodiment 2

[0031] The base asphalt PJ90 is tested by thermogravimetric-mass spectrometry instrument. The test condition is to conduct thermogravimetric mass spectrometry analysis from room temperature to 250 °C at a speed of 10°C / min, and to perform mass spectrometry analysis by setting ion channels of various molecular weights.

[0032] Refer to attached figure 2 , the TG-MS diagram of No. PJ90 asphalt, the ordinate is the ionic strength, under the premise of the same test quality, the size of the ionic strength is a direct proportional relationship with the mass of volatilized substances, the results show that these 6 different molecular weight volatilized The mass change trend is basically the same, there is release in the range of 0-300, and the mass change is great after 250 degrees. Compared with the other four releases, the asphalt smoke with molecular weight of 98.05 and 128.05 releases A little more.

Embodiment 3

[0034] For the full mass spectrum ion histogram of PJ90 at 180°C, refer to the attached image 3 , 4 , image 3 Marked is the mass spectrum with a molecular weight of 98, the abscissa is the molecular weight, and the ordinate is the ionic strength. Figure 4 is the distribution diagram of the molecular weight 98 material cracking molecular weight 41, 55 and 69

[0035] image 3 The ion intensity of relatively small molecular weight is obviously greater than that of ions with large molecular weight. This is because in the mass spectrometer, various ions volatilized from the thermogravimetric instrument may undergo fragmentation and rearrangement under the action of an electric field. Figure 4 It is a distribution diagram of a selected molecular weight of 98 with a cracked molecular weight of 41, 55 and 69. A substance with a molecular weight of 83 was obtained by cleavage of a methyl group, and the final molecular weight of the substance was 41, 55, and 69 after rearrangem...

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Abstract

The invention discloses a detection analysis method for an asphalt volatile organic compound (VOC). The detection analysis method adopts a combination manner of thermogravimetry-mass spectrometry (TG-MS) to directly carry out mass spectrometry on volatile gas in the procedure temperature controlling heating process during the operation of carrying out a thermal weight loss test on asphalt. The mass of an asphalt sample is 5-10mg. The program temperature control in the thermal weight loss testing process is raised to 250 DEG C at the speed of 10 DEG C / minute. The mass spectrometry adopts molecular weight scanning with the molecular weight from 0 to 300. A TG-MS coupled technology can be used for simultaneously determining the quality change of the asphalt and qualitatively and quantitatively analyzing the VOC in a heating state of the asphalt material and the escaping quantities of the VOCs of the different asphalt can be balanced; the relatively direct reference is provided for an asphalt VOC inhibitor researcher through determining VOC components, and the inhibition condition an asphalt VOC inhibitor of on the VOC can also be directly responded, so that the emission of the asphalt VOC is reduced.

Description

technical field [0001] The invention belongs to the technical field of thermal analysis and detection, and in particular relates to a detection and analysis method for asphalt volatile organic compounds (VOC). Background technique [0002] The global energy shortage and climate change have become a major concern of the international community, and energy conservation and emission reduction have become the common responsibility of the international community. As the largest developing country in the world, my country is increasingly becoming the object of global attention. Asphalt-based materials composed of complex mixtures of organic hydrocarbons with different molecular weights will produce volatile organic compounds (namely asphalt VOC) during service at normal temperature and pressure. High-temperature heating or light (infrared, ultraviolet, etc.) on asphalt pavement will promote the release of asphalt VOC, and its VOC emissions account for about 25% of the total VOC i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/04G01N27/64
Inventor 安继明崔培强张红华吴少鹏
Owner WUHAN UNIV OF TECH
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