破碎砾石就地热再生技术在成渝高速中的应用

Application of hot in-place recycling of crushed gravel in Chengdu-Chongqing Expressway

为研究破碎砾石沥青路面就地热再生的可行性,依托成渝高速沥青路面大、中修养护工程,采用由破碎砾石、新沥青、再生剂及回收沥青等组成的再生沥青混合料,对再生沥青的流变性能、破碎砾石集料的再生稳定性能、混合料设计及路用性能进行试验研究。结果表明:再生沥青的高温等级比回收沥青低,低温抗裂性和疲劳特性得到改善,破碎砾石集料具有有效抵抗就地热再生施工损伤的性能,路面铺筑效果良好,可进行应用推广。

To study the feasibility of hot in-place recycling(HIR)of crushed gravel,rely on the maintenance engineering of Chengdu-Chongqing Expressway asphalt pavement,the reclaimed mixture is made up from crushed gravel,new asphalt,regenerant and recycled asphalt.The rheological properties of reclaimed asphalt,regeneration stability of crushed gravel aggregate,road performance are studied.The results show that the temperature grade of reclaimed asphalt is lower than that of recycled asphalt.Low temperature anti-cracking performance and fatigue properties are improved.The crushed gravel aggregate has effective resistance to HIR construction damage,and the pavement effect was good,which can be applied and popularized.