Abstract: In order to verify the technical feasibility of adding blast furnace slag (BFS) into the cold recycling mixture of emulsified asphalt and the influence of adding BFS on the road performance of the cold recycling mixture of emulsified asphalt, two schemes of directly adding blast furnace slag and adding blast furnace slag with slaked lime as the activator were adopted and compared with the cold recycling technical scheme of adding 1.5% cement. By testing the performance indexes such as dry and wet splitting strength, freeze-thaw splitting strength, 60 ℃ dynamic stability, 60 ℃ shear strength and uniaxial compression, the reasonable utilization mode of blast furnace slag powder for emulsified asphalt cold recycled mixture was finally determined. The research shows that the dry and wet splitting strength test cannot effectively reflect the difference of water stability of cold recycled emulsified asphalt mixture, and the freeze-thaw splitting strength test is a more reasonable and effective means to evaluate its water stability. In addition, using blast furnace slag powder to replace cement directly in emulsified asphalt cold recycling mixture will reduce the water stability of the mixture, and using 1.5% blast furnace slag powder + 0.3% slaked lime activator can make the mixture have basically the same road performance as adding 1.5% cement, which shows that adding blast furnace slag + slaked lime to emulsified asphalt cold recycling mixture is feasible in technology, and the mixing method is 1.5% blast furnace slag powder + 0.3% slaked lime.

Key words: highway engineering; asphalt pavement; blast furnace slag (BFS); recycling; emulsified asphalt cold recycling

摘要： 为验证在乳化沥青冷再生混合料中掺加高炉矿渣(blast furnace slag, BFS)的可行性并分析掺加BFS的乳化沥青冷再生混合料的路用性能，采用直接掺加BFS和以消石灰做激发剂掺加BFS两种方案，与掺加1.5%水泥的冷再生技术方案进行对比试验。通过测试干湿劈裂强度、冻融劈裂强度、60 ℃动稳定度和60 ℃抗剪强度、单轴压缩等性能指标，最终确定了v用于乳化沥青冷再生混合料的合理利用方式。研究结果表明：干湿劈裂强度试验无法有效地反映乳化沥青冷再生混合料水稳定性差异；冻融劈裂强度试验能有效地评价其水稳定性。在乳化沥青冷再生混合料中用BFS直接替代水泥会降低混合料的水稳定性；采用1.5%BFS+0.3%消石灰激发剂后，可使混合料具备与掺加1.5%水泥基本相当的路用性能。

关键词: 道路工程；沥青路面；高炉矿渣(BFS)；再生利用；乳化沥青冷再生