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Impact of anti-ageing compounds on oxidation ageing kinetics of bitumen by infrared spectroscopy analysis

机译：红外光谱分析抗老化剂对沥青氧化老化动力学的影响

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This paper investigates the effect of different anti-ageing compounds (AACs) on the oxidation kinetics of bitumen using Fourier Transformation Infrared (FTIR) spectroscopy. Twenty different AACs were examined, including new and existing AACs for bitumen and polymer products. The AACs were mixed with bitumen to fabricate thin film samples of AAC-modified bitumen which were subjected to laboratory oven ageing at 100 degrees C with different ageing periods up to 504 h. A Normalized Carbonyl Index (NCI) was proposed based on a selected reference peak (1377 cm(-1)) to eliminate the impact of the inherent carbonyl content from the bitumen or AACs and manifest the carbonyl growth rate for evaluating the AACs' anti-ageing performance. It was found the activation energy of fast-term oxidation can be utilized to quantitatively screen the anti-ageing compounds and evaluate their anti-ageing effectiveness in terms of decreasing the formation of carbonyl groups in bitumen. AACs that exhibited high anti-ageing performance were those contained furfural, Irganox acid with sodium montmorillonite, furfural with DLTDP, and high concentrations (e.g., 15%) of Irganox acid. The proposed protocol should be followed by further laboratory rheological and mechanical tests on the AAC-modified bitumen with different binder sources. (C) 2019 Elsevier Ltd. All rights reserved.
机译：本文使用傅立叶变换红外光谱（FTIR）研究了不同的抗老化化合物（AAC）对沥青氧化动力学的影响。检查了20种不同的AAC，包括用于沥青和聚合物产品的新AAC和现有AAC。将AAC与沥青混合以制备AAC改性沥青的薄膜样品，然后将其在100摄氏度的实验室烘箱中老化，并持续504小时。根据选定的参考峰（1377 cm（-1））提出了归一化羰基指数（NCI），以消除沥青或AAC中固有的羰基含量的影响，并显示出羰基生长速率，以评估AAC的抗油性。老化性能。发现可以利用快速氧化的活化能定量地筛选抗老化化合物，并根据减少沥青中羰基的形成来评估其抗老化效果。表现出高抗老化性能的AAC包括糠醛，含蒙脱石钠的Irganox酸，含DLTDP的糠醛和高浓度（例如15％）的Irganox酸。拟议的方案之后，应在具有不同粘合剂来源的AAC改性沥青上进行进一步的实验室流变和力学测试。 （C）2019 Elsevier Ltd.保留所有权利。

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