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The oxidation of bitumen witnessed in-situ by infrared spectroscopy

机译：红外光谱现场观察沥青的氧化

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During the production and recycling of asphalt concrete, bitumen in contact with inorganic particles is exposed to air at high temperatures. As a result an oxidation of bitumen, also known as aging, occurs. The reaction between bitumen and air at 163 degrees C was studied insitu with and without the presence of inorganic impurities by means of fourier transform infrared spectroscopy in the attenuated reflectance mode. This oxidation was discovered to be a step-wise reaction facilitated by the oxidation of thiols and creation of peroxides within the system. The rate of reaction was demonstrated to depend on the type of impurity present, of which iron (III) chloride was the strongest catalyst. It was further demonstrated that the oxidation reaction is inhibited by the adsorption of thiol species present in the system on copper particles. Combining copper with the iron (III) chloride-containing system also resulted in the inhibition of signal increase in the sulfoxide region of the spectra. The results of this preliminary research on the bitumen oxidation reaction presented are proposed for further research regarding control of aging of asphalt concrete, especially during the recycling works.
机译：在沥青混凝土的生产和回收过程中，与无机颗粒接触的沥青会在高温下暴露于空气中。结果，发生沥青的氧化，也称为老化。通过傅里叶变换红外光谱法在衰减反射率模式下，在有无无机杂质的条件下原位研究了沥青与空气在163摄氏度下的反应。发现该氧化是通过在系统内硫醇的氧化和过氧化物的产生促进的逐步反应。已证明反应速率取决于存在的杂质类型，其中氯化铁（III）是最强的催化剂。进一步证明，氧化反应被系统中存在的硫醇种类在铜颗粒上的吸附所抑制。将铜与含氯化铁（III）的系统结合使用还可以抑制光谱亚砜区域中信号的增加。提出的有关沥青氧化反应的初步研究结果被建议用于进一步控制沥青混凝土的老化，特别是在回收工作中。

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