Bio-asphalt is a binding agent that is made of bio-oil and petroleum asphalt, or bio-oil modified with incorporations of some other additives under certain conditions. This study was carried out to evaluate the properties of bio-asphalt binder-based in terms of the value of complex shear modulus (G^∗) and the phase angle (δ) tested by dynamic shear rheometer (DSR). Four bio-oil dosages of 5, 10, 15, and 20% based on the weight of asphalt (S100) were used to alter the SBS-modified binder. Whereby, the SBS content is approximately 1% of the weight of the virgin asphalt. The complex shear modulus and frequencies of virgin and short-term aged binders were tested. The master curves of rutting factor (G^∗/sinδ) of different bio-asphalt were then generated to survey its rheological properties in a broad range of frequencies and temperatures. Based on the results, it was found that the addition of bio-oil extracted from sawdust has significantly increased the complex shear modulus of asphalt binder at the same frequency conditions after going through rolling thin film oven (RTFO), which is desirable for rutting prevention of asphalt mixtures. The rheological properties of bio-binders are more susceptible to the RTFO aging condition compared to the reference binder. The master curve of rutting factor of bio-binder indicated that the rutting factor of bio-asphalt increased with the increase of frequency before and after RTFO. Additionally, incorporations of bio-oil into the SBS modified asphalt, has greatly increased the rutting factor (G^∗/sinδ) after RTFO, regardless of the loading frequency. However, the degree of enhancement was dominated by the percentage of bio-oil and aging condition.

生物沥青是一种由生物油和石油沥青制成的粘合剂，或在某些条件下通过掺入一些其他添加剂而改性的生物油。进行了这项研究，以根据复合剪切模量（G ^∗）的值和通过动态剪切流变仪（DSR）测试的相角（δ）评估基于生物沥青粘合剂的性能。基于沥青重量（S100）的5、10、15和20％的四种生物油剂量用于更改SBS改性的粘合剂。因此，SBS含量约为原始沥青重量的1％。测试了原始和短期老化粘合剂的复数剪切模量和频率。车辙系数主曲线（G ^∗然后生成不同生物沥青的/sinδ），以研究其在很宽的频率和温度范围内的流变特性。根据该结果，发现从木屑中提取的生物油的添加显着增加了在经过滚动薄膜烘箱（RTFO）后在相同频率条件下沥青粘合剂的复数剪切模量，这对于防止车辙是理想的沥青混合物。与参考粘合剂相比，生物粘合剂的流变特性更容易受到RTFO老化条件的影响。生物粘合剂的车辙因子主曲线表明，生物沥青的车辙因子随RTFO前后频率的增加而增加。此外，将生物油掺入SBS改性沥青中，极大地增加了车辙系数（G^∗ /sinδ）在RTFO之后，与加载频率无关。但是，增强程度主要由生物油的百分比和老化条件决定。