Emission analysis of recycled tire rubber modified asphalt in hot and warm mix conditions
Emission analysis of recycled tire rubber modified asphalt in hot and warm mix conditions
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DOI：
10.1016/j.jhazmat.2018.11.080
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发表时间：
2019-03-05
影响因子：
13.6
通讯作者：
Luo, Sang
中科院分区：
文献类型：
--
作者：
Yang, Xu;You, Zhanping;Luo, Sang
废橡胶粉改性沥青在施工过程中的有害物质排放一直是人们关注的问题。本研究的目的是确定在传统的热拌沥青混合料（HMA）和最近开发的温拌沥青混合料（WMA）的CR改性沥青的排放成分。采用动态顶空气相色谱-质谱联用技术（GC-MS）对沥青结合料在120 ℃、140 ℃和160 ℃下的挥发物进行了分析。采用气相色谱-傅里叶变换红外光谱联用技术（GC-FTIR）分析了常规HMA、CR-HMA和CR-WMA在工厂混合过程中的排放。结果表明，混合温度对排放量有很大的影响。温拌技术可以显著降低碳纤维沥青混合料的排放，应在含碳纤维沥青混合料中推广。沥青来源和生产CR改性沥青时添加的其他添加剂也会对排放产生显著影响。与不含CR的沥青混合料相比，含CR的沥青混合料会释放出更高的二甲苯和甲苯等有毒物质。另外，由于沥青混合料的沥青膜较薄，沥青结合料GC-MS测试的排放量低于沥青混合料现场测试的排放量。
The hazardous emissions of crumb rubber (CR) modified asphalt during construction has been a concern for a long period. This study aims to identify the emission components in the CR modified asphalt in traditional hot mix asphalt (HMA) and with recently developed warm mix asphalt (WMA). The dynamic headspace gas chromatography-mass spectrometry (GC-MS) was employed for identifying the emission of asphalt binders at 120 degrees C, 140 degrees C and 160 degrees C. The coupling of gas chromatography and Fourier-transform infrared spectroscopy (GC-FTIR) was used to analyze the emission during the plant mixing for conventional HMA, CR-HMA and CR-WMA. The results showed the emission amount was highly dependent on mixing temperature. The warm mix technology can reduce the emission level significantly and should be encouraged in the asphalt mixture containing CR. Asphalt source and other extra additives in producing CR modified asphalt can also affect the emission significantly. Asphalt mixture containing CR can release toxic emissions such as xylene and toluene significantly higher compared to that without CR. In addition, it was found that the emission amount from the GC-MS test for asphalt binder was lower than that in the field test for asphalt mix due to the thin asphalt film of asphalt mix.