Method for evaluating suppression effect of smoke suppressor on release process of asphalt thermal decomposition product

A technology of thermal decomposition and smoke suppressant, which is applied in the field of asphalt materials, can solve the problems of inaccurate evaluation methods of asphalt smoke suppression performance, and achieve the effect of accurate and reliable evaluation methods, good reproducibility, and high sensitivity

Inactive Publication Date: 2014-01-08
NANJING FORESTRY UNIV
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Problems solved by technology

[0018] The purpose of the present invention is to provide a new method for accurately evaluating the inhibitory effect of smoke suppressants on the release process of asphalt thermal decomposition products. The method

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  • Method for evaluating suppression effect of smoke suppressor on release process of asphalt thermal decomposition product

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Embodiment Construction

[0027] Adopt the method that the evaluation fire retardant that the present invention proposes to asphalt fire-retardant effect, concrete steps are as follows:

[0028] (1) To prepare smoke-suppressing asphalt samples, heat the asphalt to a certain temperature, and after melting and flowing, add different types and dosages of smoke suppressants respectively, and stir fully to make the smoke suppressant and asphalt matrix fully mixed, and the preparation is uniform , stable smoke-suppressing asphalt;

[0029] (2) Take a 20mg sample and conduct a thermal decomposition test using a differential scanning calorimeter. The heating rate is 10°C / min, from room temperature to 800°C, and the air flow rate is 100ml / min. The thermal decomposition products are directly blown into the mass spectrometer for mass spectrometry analysis, scanning and recording every 4s, and simultaneously obtain test data such as DSC curve, char formation rate, and continuous mass spectrogram;

[0030] (3) Acc...

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Abstract

The invention relates to a method for evaluating suppression effect of a smoke suppressor on a release process of an asphalt thermal decomposition product, belongs to the technical field of asphalt material safety, and solves the problem that an existing asphalt smoke suppression performance evaluation method is inaccurate. According to a technical scheme combining DSC-MS (differential scanning calorimetry-mass spectrometry) and thermal analysis kinetics theoretical calculation, the method includes: firstly, testing asphalt with a DSC-MS analyzer to acquire data such as a DSC curve and a continuous mass spectrogram; secondly, analyzing the continuous mass spectrogram, understanding rules of variation, with temperature, of components and concentration of volatile matters produced during asphalt thermal decomposition, and evaluating the smoke suppression effect of the smoke suppressor on the asphalt; thirdly, determining a reaction mechanism function and a conversion rate function of the asphalt thermal decomposition process, solving thermal analysis kinetics parameter activation energy E and a frequency factor A, and quantitatively evaluating the smoke suppression effect of the smoke suppressor on the asphalt; finally, comparing E and A of matrix asphalt with those of smoke suppression type asphalt, and combining a mass spectrogram analysis result to more accurately evaluate the suppression effect of the smoke suppressor on the asphalt release thermal decomposition product.

Description

technical field [0001] The invention is an evaluation method for accurately evaluating the inhibitory effect of smoke suppressants on the release process of asphalt thermal decomposition products based on the combination of differential scanning calorimetry-mass spectrometry analysis combined with thermal analysis kinetic theoretical formula calculation, which belongs to asphalt materials technical field. Background technique [0002] With the rapid development of my country's urban construction, large-scale urban underground passages have also been developed simultaneously as an important part of the urban traffic pattern, such as Nanjing Xuanwu Lake Tunnel and Jiuhuashan Tunnel. Underground passages can be used in the construction of mountains and lakes to overcome terrain and elevation obstacles, improve alignment, shorten driving mileage, increase driving speed, and protect the ecological environment. Therefore, large-scale underground passages are widely used in urban ...

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Application Information

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IPC IPC(8): G01N25/00G01N25/02G01N25/20
Inventor 许涛石华泉张超超王璐露许银银王沫高月
Owner NANJING FORESTRY UNIV
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