沥青路面厂拌冷再生混合料路用性能试验

Experimental Study on Performance of Cold In-Plant Recycling of Asphalt Mixtures and Its Testing Road

目的对废旧铣刨料进行再生利用,以期节约大量建设资金、能源,保护环境.方法通过真空饱水马歇尔稳定度和冻融劈裂室内试验,研究了工厂冷再生沥青混合料路用性能,并铺筑了试验段对室内试验结果进行了验证.结果采用富含芳羟分的慢裂乳化沥青作为再生剂,再生料的高温稳定性能较好,低温抗裂性能基本满足低等级路面的技术要求,而水稳定性能相对较差,添加水泥可明显改善工厂冷再生沥青混合料的水稳定性能,也可提高其高温稳定性能,但对低温抗裂性能改善效果不明显.试验路施工和检测表明,新料与旧料掺配比例为1:6和1:7时,施工效果最好,不掺新料时,效果也可以.结论工厂冷再生路面完全满足《公路沥青路面设计规范》中低等级公路路面的技术要求.

To save capital and sources and to protect environment, the waste and scrap of material is recycled. By in-door experiment of Marshall under vacuum and freeze thawing and testing rods, performance of cold in-plant recycling and asphalt mixtures was studied. Experimental results show that regenerant with a higher aryl and hydroxy has a good effect on recycling old asphalt mixtures, and the performance of recycling mixtures at high temperature is good. Their performance at low temperature can meet the requirements of low grade pavement, whereas, the moisture susceptibility of recycling mixture is poorer. It is also suggested that cement has a marked effect on improving the moisture susceptibility of recycling mixtures;cement is also useful for improving the performance at high temperatures. However, cement is unapparent for the performance at low temperature. Through the investigation on the testing road, it is proved that cold in-plant recycling mixtures is fit for the construction of low grade pavement, and when the proportion of new mixtures to old ones is 1：6 or 1：7, the final mixture has a good pavement performance. Moreover, the testing road paved by pure recycling mixtures has an acceptability performance as well.