An Analysis on Fume Enrichment Method and Release Rule for Asphalt Mixture
The disorderly emission and poor treatment effect of asphalt mixture fume in asphalt mixing stations have caused huge harm to the natural environment and human health.Based on the mass method,the fume generation-enrichment device is self-designed and assembled,which is suitable for the mixing state of asphalt mixture plant,and the study on the fume release rules during asphalt mixture mixing is carried out.4 kinds of petroleum asphalt are selected,and considering the conditions of asphalt fume generation in the field mixing station,the mixing temperature,aggregate specific surface area and mixing frequency are determined as the key factors affecting the fumer release.The exposed area of the aggregate is calculated by the measured modified specific surface area calculation method,and the influence of each key factor on the smoke release of the plant-mixed asphalt mixture is analyzed.The result shows that(1)the self-designed and assembled fume generation-enrichment device has good stability and can ensure the accuracy of the experimental results;(2)the magnitude of the light components in the fume under different mixing conditions is much lower than that of the heavy components,and the fume release after the base asphalt modified by SBS is reduced;(3)mixing temperature is the most critical factor that determines the amount of fume release,the amount of fume release shows an obvious growth trend with the increase in temperature,fume production has strong temperature sensitivity,release varies significantly under different mixing temperatures,and 160℃ and 170℃ are the jumping nodes of fume release;(4)the amount of fume produced by the asphalt mixture is directly proportional to the specific surface area of the aggregate,and the specific surface area of the aggregate directly affects the amount of fume released by determining the exposed area of asphalt;(5)the amount of fume release is positively related to the mixing frequency,compared with the heavy components of the fume,the release amount of the light components of fume is less affected by the mixing frequency.The study result can provide theoretical and technical support for the release and disposal of fume in mixing plants.
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