Abstract: The recycling of old asphalt mixture (RAP) has high economic value and environmental protection benefits. When the content of RAP is high or the aging of old asphalt is serious, it is necessary to add asphalt regeneration agent to ensure the road performance of recycled asphalt. The effects of three kinds of vegetable oil regeneration agents, such as fresh vegetable oil, fried vegetable oil and vegetable diesel oil as well as a traditional mineral oil regeneration agent on the road performance of the aged SBS modified asphalt mixture were studied. Two kinds of the content such as 30% and 50% were selected by RAP, and the optimum content of four kinds of regeneration agents was used to regenerate RAP under the condition of the best ratio of oil to stone, respectively. Finally, the rutting test, trabecular bending test and freeze-thaw splitting test of recycled asphalt mixture were carried out on the recycled asphalt mixture. Based on the proposed experimental conditions, when the content of RAP is 30% and the ratio of oil to stone is 4.8%, the regeneration effect of the aged SBS modified asphalt mixture was the best by using 4.5% fresh vegetable oil as regeneration agent.

Key words: highway engineering; vegetable oil; regenerant; RAP; road performance

摘要： 旧沥青混合料（RAP）的再生利用具有较高的经济价值和环保效益，当RAP掺量较高或旧沥青老化严重时，需要掺加沥青再生剂才能保证再生沥青的路用性能。研究新鲜植物油、煎炸植物油、植物柴油3种植物油再生剂和一种传统矿物油再生剂对老化SBS改性沥青混合料路用性能的影响。RAP选择30%和50%两种掺量，在各自油石比最佳的情况下，分别以4种再生剂的最佳掺量对其进行再生，最后对其再生沥青混合料进行车辙试验、小梁弯曲试验和冻融劈裂试验。基于文中试验条件下，当RAP掺量为30%，油石比为4.8%时，以4.5%的新鲜植物油作为再生剂对老化SBS改性沥青混合料再生效果最佳。

关键词: 道路工程；植物油；再生剂；RAP；路用性能