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新型石墨基复合抗老化剂对沥青热老化性能的改善

Improvements of Developed Graphite Based Composite Anti-Aging Agent on Thermal Aging Properties of Asphalt.

作者信息

Hu Zhihui, Xu Tao, Liu Pengfei, Oeser Markus, Wang Haopeng

机构信息

College of Civil Engineering, Nanjing Forestry University, 159 Longpan Road, Nanjing 210037, China.

Institute of Highway Engineering, Rheinisch-Westfälische Technische Hochschule Aachen University, Mies-van-der-Rohe-Street 1, 52074 Aachen, Germany.

出版信息

Materials (Basel). 2020 Sep 10;13(18):4005. doi: 10.3390/ma13184005.

DOI:10.3390/ma13184005
PMID:32927682
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7558940/
Abstract

To reduce the thermal-oxidative aging of asphalt and the release amount of harmful volatiles during the construction of asphalt pavement, a new composite anti-aging agent was developed. Since the volatiles were mainly released from saturates and aromatics during the thermal-oxidative aging of asphalt, expanded graphite (EG) was selected as a stabilizing agent to load magnesium hydroxide (MH) and calcium carbonate (CaCO) nanoparticles for preparing the anti-aging agents of saturates and aromatics, respectively. Thermal stability and volatile constituents released from saturates and aromatics before and after the thermal-oxidative aging were characterized using the isothermal Thermogravimetry/Differential Scanning Calorimetry-Fourier Transform Infrared Spectrometer test (TG/DSC-FTIR test). Test results indicate that anti-aging agents of EG/MH and EG/CaCO effectively inhibit the volatilization of light components in asphalt and improve the thermal stability of saturates and aromatics. Then, the proportions of EG, MH, and CaCO added in the developed composite anti-aging agent of EG/MH/CaCO are 2:1:3 by weight. EG/MH/CaCO plays a synergetic effect on inhibiting the thermal-oxidative aging of asphalt, and reduces the release amount of harmful volatiles during the thermal-oxidative aging after EG/MH/CaCO is added into asphalt at the proposed content of 10 wt.%. EG plays a synergistic role with MH and CaCO nanoparticles to prevent the chain reactions, inhibiting the thermal-oxidative aging of asphalt.

摘要

为减少沥青路面施工过程中沥青的热氧化老化及有害挥发物的释放量，开发了一种新型复合抗老化剂。由于在沥青热氧化老化过程中挥发物主要从饱和烃和芳烃中释放出来，因此选择膨胀石墨（EG）作为稳定剂，分别负载氢氧化镁（MH）和碳酸钙（CaCO）纳米颗粒来制备饱和烃和芳烃的抗老化剂。采用等温热重/差示扫描量热-傅里叶变换红外光谱测试（TG/DSC-FTIR测试）对热氧化老化前后饱和烃和芳烃释放的热稳定性及挥发性成分进行了表征。测试结果表明，EG/MH和EG/CaCO抗老化剂能有效抑制沥青中轻组分的挥发，提高饱和烃和芳烃的热稳定性。然后，在开发的EG/MH/CaCO复合抗老化剂中，EG、MH和CaCO的添加比例按重量计为2:1:3。EG/MH/CaCO对抑制沥青的热氧化老化具有协同作用，当以10 wt.%的建议含量将EG/MH/CaCO添加到沥青中时，可减少热氧化老化过程中有害挥发物的释放量。EG与MH和CaCO纳米颗粒发挥协同作用，阻止链反应，抑制沥青的热氧化老化。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cd15/7558940/35d6829790ba/materials-13-04005-g008.jpg
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