基于“无废城市”理念的高速公路RAP厂拌热再生技术研究

Study on Plant Mixed Hot Reclaiming Technology of Expressway RAP Based on “No-waste City” Concept

摘要:

以海南省G98环岛高速改建工程为背景，研究经厂拌热再生技术处理后的沥青路面废弃料（RAP）可回收利用，减少环境污染及经济造价。把RAP掺量分为30%、40%、50% 3种进行设计成再生沥青混合料，通过在旧沥青中添加5档不同掺量的再生剂，对比沥青的针入度、软化点、延度3大指标，确定最佳再生剂用量，利用马歇尔试验确定最佳油石比，可制备成级配稳定的AC-20再生沥青混合料，并分别进行高温稳定性研究和水稳定性研究，结果表明：添加不同掺量的RAP均可有效提升高温稳定性，使抗变形能力增强，当RAP掺量为40%时，水稳定性表现为最好，各项路用性能均满足规范所需要求。综上所述，厂拌热再生技术完全可以在海南省进行大规模应用。

Abstract:

Taking the Hainan Province G98 Roundabout Expressway Reconstruction Project as the background, the recyclable utilization of reclaimed asphalt pavement (RAP) treated by the plant mixed hot reclaiming technology is studied to reduce the environmental pollution and economic costs. The RAP content is divided into three types of 30%, 40% and 50% to design the reclaimed asphalt mixture. By adding five different contents of reclaiming agent in the old asphalt, three major indicators of needle penetration, softening point and ductility of asphalt are compared to determine the optimal content of reclaiming agent. The Marshall test is used to determine the optimal oil aggregate ratio to prepare the stable graded AC-20 reclaimed asphalt mixture. And the high-temperature stability and water stability are studied. The results show that adding the different contents of RAP can effectively improve high-temperature stability and enhance the deformation resistance. When the RAP content is 40%, the water stability is the best, and all pavement performances meet the requirements of the specifications. In summary, the plant mixed hot reclaiming technology can be widely applied in Hainan Province.