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聚碳酸酯和聚四氟乙烯改性沥青的流变学、老化及微观结构特性

Rheological, Aging, and Microstructural Properties of Polycarbonate and Polytetrafluoroethylene Modified Bitumen.

作者信息

Ansar Muhammad, Sikandar Muhammad Ali, Althoey Fadi, Tariq Muhammad Atiq Ur Rehman, Alyami Saleh H, Elsayed Elkhatib Samah

机构信息

Department of Civil Engineering, CECOS University of IT and Emerging Sciences, Peshawar 25000, Pakistan.

Department of Civil Engineering, Najran University, Najran 66454, Saudi Arabia.

出版信息

Polymers (Basel). 2022 Aug 12;14(16):3283. doi: 10.3390/polym14163283.

DOI:10.3390/polym14163283
PMID:36015539
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9414428/
Abstract

Deterioration of asphalt pavements due to massive load of vehicles and climatic variation has demanded the use of pavements construction material with an excellent resilience characteristic, resistance to permanent deformation, and most importantly, a much longer service lifespan. The main structural distresses in pavement construction are permanent deformation at high temperatures and fatigue cracking under repetitive traffic loadings. To comprehensively investigate the performance of bitumen penetration grade (PG) 70 against rutting, fatigue, and high temperature cracking in hot mix asphalt (HMA) pavements, polycarbonate (PC) and polytetrafluoroethylene (PTFE) were used. The investigation of the internal structure, rheological, and physical properties of base and modified bitumen (MB) mixes with different percentages of modifiers (0%, 2.5%, and 5%) by weight were performed via scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR) analysis, X-ray diffraction (XRD) pattern analysis, rolling thin-film oven test (RTFOT), pressurized aging vessel (PAV), dynamic shear rheometer (DSR), rotational viscosity (RV), and bending beam rheometer (BBR). The results of the RV test indicate that modification of neat bitumen with polycarbonate and polytetrafluoroethylene increased the viscosity for polycarbonate-modified bitumen (PCMB), polytetrafluoroethylene-modified bitumen (PTFEMB), and for a blend of PCMB-PTFEMB by 44%, 50%, and 55.75% at 135 °C and 111.10%, 127.80%, and 138.88% at 165 °C, accordingly. BBR test results revealed that modifiers increased the rigidity of neat bitumen by 74.8%, 75.8%, and 74.5% at -16 °C, -22 °C, and -28 °C, respectively.

摘要

由于车辆的大量荷载和气候变化，沥青路面出现了恶化，这就要求使用具有优异回弹特性、抗永久变形能力，最重要的是具有更长使用寿命的路面建筑材料。路面施工中的主要结构病害是高温下的永久变形和重复交通荷载作用下的疲劳开裂。为了全面研究70号沥青针入度等级（PG）在热拌沥青（HMA）路面中的抗车辙、抗疲劳和抗高温开裂性能，使用了聚碳酸酯（PC）和聚四氟乙烯（PTFE）。通过扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）分析、X射线衍射（XRD）图谱分析、旋转薄膜烘箱试验（RTFOT）、压力老化容器（PAV）、动态剪切流变仪（DSR）、旋转粘度（RV）和弯曲梁流变仪（BBR），对含有不同重量百分比改性剂（0%、2.5%和5%）的基质沥青和改性沥青（MB）混合料的内部结构、流变学和物理性能进行了研究。RV试验结果表明，用聚碳酸酯和聚四氟乙烯对纯沥青进行改性后，聚碳酸酯改性沥青（PCMB）、聚四氟乙烯改性沥青（PTFEMB）以及PCMB-PTFEMB混合料在135℃时的粘度分别提高了44%、50%和55.75%，在165℃时分别提高了111.10%、127.80%和138.88%。BBR试验结果显示，改性剂在-16℃、-22℃和-28℃时分别使纯沥青的刚度提高了74.8%、75.8%和74.5%。

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