本研究的目的是提高生物沥青的高温抗车辙和抗老化特性。在这项研究中,选用硅灰(SF)对生物沥青进行改性。生物油在生物沥青中的用量为5%,SF的用量为2%,4%,6%,8%,和10%的生物沥青.高低温特性,抗老化,通过温度扫描(TS)评估Bio+SF的温度敏感性,多应力蠕变恢复(MSCR)试验,弯曲梁流变(BBR)试验,和粘度测试。同时,使用车辙试验评估Bio+SF混合物的道路性能,低温弯曲梁试验,冻融劈裂试验,和疲劳测试。实验结果表明,SF的用量可以提高抗高温车辙性能,抗老化,生物沥青的温度稳定性。SF的用量越高,增强效果越显著。然而,掺入SF弱化生物沥青的低温抗裂性能。当SF用量小于8%时,BioSF的低温抗裂性仍优于基质沥青。与基质沥青混合料相比,动态稳定性,破坏性应变,冻融劈裂强度比,5%生物+8%SF混合物的疲劳寿命提高了38.4%,49.1%,5.9%,和68.9%,分别。研究表明,SF改性生物沥青的开发能够满足公路工程的技术要求。使用SF和生物油可以减少自然资源的消耗,并积极减少环境污染。
The objective of this research is to enhance the high-temperature antirutting and antiaging characteristics of bioasphalt. In this study, silica fume (SF) was selected to modify bioasphalt. The dosage of bio-oil in bioasphalt was 5%, and the dosage of SF was 2%, 4%, 6%, 8%, and 10% of bioasphalt. The high- and low-temperature characteristics, aging resistance, and temperature sensitivity of Bio + SF were evaluated by temperature sweep (TS), the multiple stress creep recovery (MSCR) test, the bending beam rheology (BBR) test, and the viscosity test. Meanwhile, the road behavior of the Bio + SF mixture was evaluated using the rutting test, low-temperature bending beam test, freeze-thaw splitting test, and fatigue test. The experimental results showed that the dosage of SF could enhance the high-temperature rutting resistance, aging resistance, and temperature stability of bioasphalt. The higher the dosage of SF, the more significant the enhancement effect. However, incorporating SF weakened bioasphalt\'s low-temperature cracking resistance properties. When the SF dosage was less than 8%, the low-temperature cracking resistance of Bio + SF was still superior to that of matrix asphalt. Compared with matrix asphalt mixtures, the dynamic stability, destructive strain, freeze-thaw splitting strength ratio, and fatigue life of 5%Bio + 8%SF mixtures increased by 38.4%, 49.1%, 5.9%, and 68.9%, respectively. This study demonstrates that the development of SF-modified bioasphalt could meet the technical requirements of highway engineering. Using SF and bio-oil could decrease the consumption of natural resources and positively reduce environmental pollution.