In this work, the effect of ultraviolet (UV) radiation on samples of asphalt binder mixed with crumb rubber is studied. Two sets of samples are characterised using a PG 64-22 neat binder with different percentages of rubber particles being 0, 16.6, and 20.0 wt.%. One set of the samples was stored at ambient temperature (called the unaged set) and the other was inserted inside an accelerated weathering tester for 100 h (called the UV-aged set). Thermal conductivity, chemical indices, rheology, and morphology of both sets of samples are tested using the flash method, differential scanning calorimeter (DSC), Fourier-Transform Infrared Spectroscopy (FTIR), dynamic shear rheometer (DSR), and Scanning Electron Microscope (SEM), respectively. Results show that the addition of rubber leads to a reduction of specific heat for the rubber-modified binders. Specific heat capacities of the three UV aged samples are larger than those of their unaged counterparts, and the 16.6%-aged has the highest value. FTIR spectra of the three unaged samples are very similar, whereas distinct changes occur after UV exposure. The normalised absorbance of the peak associated with S = O group increases and the peak for the aliphatic group decreases after UV aging, showing some evidence of oxidation due to UV aging. Use of crumb rubber in the binder decreases the thermal conductivity and 20.0 wt.% sample is even less conductive compared to the 16.6 wt.%. At all temperatures above 25°C, aged samples have lower thermal conductivity than the unaged ones, except neat binder which is opposite. Rheological measurements show that the complex modulus of the samples increases with the addition of rubber particles and also after aging. However, 16.6% rubber-modified sample shows the least increase in modulus after aging. Microscopic morphology shows that UV radiation causes cracks in both neat and rubber modified binder. Smaller cracks are seen to form, and the cracked pieces are stuck together in the rubber modified binders, whereas less cohesion between the cracks is observed in the neat binder.

在这项工作中，研究了紫外线（UV）辐射对掺入碎胶的沥青粘合剂样品的影响。使用PG 64-22纯净粘合剂表征两组样品，其中不同百分比的橡胶颗粒百分比分别为0、16.6和20.0 wt。％。一组样品在室温下存储（称为未老化组），另一组样品在加速老化测试仪中插入100小时（称为UV老化组）。使用闪光法，差示扫描量热仪（DSC），傅里叶变换红外光谱（FTIR），动态剪切流变仪（DSR）和扫描电子显微镜（）来测试两组样品的热导率，化学指数，流变学和形态。 SEM）。结果表明，橡胶的添加导致橡胶改性的粘合剂的比热降低。这三个UV老化样品的比热容大于未老化样品的比热容，并且16.6％的老化热容值最高。三个未老化样品的FTIR光谱非常相似，而暴露于紫外线后会发生明显变化。UV老化后，与S = O基团相关的峰的归一化吸光度增加，而脂族基团的峰减少，这表明了一些因UV老化而氧化的迹象。在粘合剂中使用粒状生胶会降低热导率，与16.6 wt％的样品相比，20.0 wt。％的样品的导电性甚至更低。在高于25°C的所有温度下，老化的样品的导热系数都比未老化的样品低，除了相反的纯净粘合剂。流变学测量表明，样品的复数模量随着橡胶颗粒的添加以及老化后而增加。然而，16.6％的橡胶改性样品在老化后的模量增加最少。微观形态表明，紫外线辐射在纯净和橡胶改性的粘结剂中均引起裂纹。可以看到形成了较小的裂缝，并且破裂的碎片在橡胶改性的粘合剂中粘结在一起，而在纯粘合剂中发现的裂缝之间的内聚力较小。