蓖麻油生物沥青调和沥青混合料使用性能研究

为了评价蓖麻油生物沥青调和沥青混合料的使用性能，设计了具有5种蓖麻油生物沥青掺量且级配均为AC-20C的沥青混合料，根据各掺量最佳油石比制作试件并进行混合料使用性能试验.根据试验结果分析了不同掺量调和沥青混合料的高温稳定性、水稳定性、低温抗裂性、路面设计参数等性能指标.分析表明，随着生物沥青掺量的增加，调和沥青混合料的高温稳定性、水稳定性、抗压回弹模量逐渐降低，但在一定掺量范围内满足JTG F40—2004《公路沥青路面施工技术规范》的要求，此外水稳定性在加入消石灰后得到显著改善.随着生物沥青掺量的增加，劈裂抗拉强度降低至一谷值后略有提高，低温抗裂性得到改善.由此可见，将蓖麻油生物沥青调和沥青替代石油沥青用于混合料，在一定掺量范围内是可行的.
In order to investigate the performance of castor oil-based bioasphalt blended asphalt mixture，design of AC-20C blended asphalt mixture with 5 different percentages of bioasphalt was conducted. Performance tests were then carried out on the specimens with optimum asphalt contents of respective percentages of bioasphalt. Based on the test results，the properties such as high temperature stability，moisture damage resistance，low temperature cracking resistance，and pavement structure design parameters were analyzed. The analyses indicate that with increasing percentage of bioasphalt，the high temperature stability，moisture damage resistance and compressive resilient modulus of the blended asphalt mixture decrease，but they satisfy the requirements of JTG F40-2004 within a certain range of percentage. The moisture damage resistance is significantly improved by adding hydrated lime. With increasing percentage of bioasphalt，the indirect tensile strength of the blended asphalt mixture decreases to the minimum value and then increases slightly，while the low temperature cracking resistance of the blended asphalt mixture increases. Hence，the use of castor oil-based bioasphalt as partial replacement to petroleum based asphalt in asphalt mixture is feasible.