# Analysis of the Odor Purification Mechanism and Smoke Release of Warm-Mixed Rubber Asphalt
## 1 Introduction
In order to effectively collect rubber asphalt smoke, scholars have conducted in-depth research. Asphalt contains many chemicals with low boiling points; thus, when asphalt is at high temperatures, these substances will evaporate into the air. Therefore, the asphalt flue gas collection device needs to have heating and sealing devices. The asphalt smoke enrichment device used by [PERSON] et al. uses dry air to introduce the asphalt smoke from the sealed system into the collection device. The collection material used is quartz fiber, which can collect the heavier, intermediate, and lighter components in the smoke [24]. In order to more accurately measure the particle content in asphalt smoke, researchers have developed a more advanced asphalt smoke collection device, which can quantitatively evaluate the degree of smoke pollution. The research on asphalt smoke collection devices is extensive, and some scholars have attempted to collect the smoke generated by asphalt mixtures to analyze the smoke generated during the mixing process [25]. [PERSON] et al. designed a smoke collection device in conjunction with an asphalt mixture mixing device, which can directly analyze the type and concentration of smoke generated during the mixing process of the mixture [5]. Some scholars have improved the gas collection device for rubber asphalt, which can collect smoke and statistically analyze its quality while changing the mixing conditions. It is necessary to consider the variation pattern of rubber asphalt smoke during the mixing and paving process of the mixture, in order to further clarify the smoke emissions during the entire process of rubber asphalt construction [26]. Purifiers can effectively remove the foul odor of asphalt, and some scholars have studied the deodorization mechanism of deodorizers [27]. [PERSON] et al. studied the deodorization effect of liquid and powder deodorants on rubber asphalt and found that liquid deodorants have a better deodorization effect than powder deodorants. The deodorization mechanism is that the deodorant adsorbs rubber powder and inhibits its degradation in asphalt [28]. [PERSON] et al. selected an ion chelating material from three deodorizers to prepare purified asphalt. The control of asphalt odor by this material is reflected in the chelation reaction with nitrogen and sulfur heteroatoms in rubber-modified asphalt, thereby inhibiting the volatilization of sulfur elements [2]. [PERSON] et al. studied the inhibitory effect of aldehyde chemical modifiers on toxic gases in coal tar pitch and found that aldehydes can suppress harmful gas emissions by reducing most of the toxic polycyclic aromatic hydrocarbons released during asphalt pyrolysis [29]. For the study of the coupling effect of different temperature mixing agents and deodorizers on the deodorization effect and deodorization mechanism, the combination of temperature mixing agents and deodorizers needs to be carefully considered. Through experimental testing of the harmful component composition of asphalt flue gas, the degradation rate and corresponding change rate of harmful gas concentration should be determined. Exploring the changes in harmful gas components in asphalt smoke can be achieved by adjusting the dosage of deodorizers. At the same time, the orthogonal experimental method is used to demonstrate the coupling effect between the warm-mixing agent and the deodorizing agent, explore whether there is an interaction between the two in the warm-mixing and deodorizing effects, and provide the optimal design scheme for the warm-mixing construction effect and degradation effect. Based on chemical testing methods such as Fourier transform infrared spectroscopy (FTIR) and gas chromatography-mass spectrometry (GC-MS), we can analyze the changes in the composition of warm-mix clean-odor asphalt, explore the chemical reactions caused by clean-odor agents and warm-mix agents, and reveal the mechanism of asphalt clean odor.