Feasibility of Recycling Technology of Crumb Rubber Modified Asphalt

The aged crumb rubber modified asphalt (abbreviated as CRMA) was recycled with two methods which were adding fresh CRMA binder and adding recycling agent to investigate the recycling feasibility of aged CRMA binder. The performance of recycled CRMA binder was evaluated systematically with a variety of indices, including penetration, softening point, ductility and viscosity. The results indicate that the performance of recycled CRMA binder has good correlation with the content of the fresh CRMA binder or recycling agent. The performance of recycled CRMA binder mixing with the fresh CRMA binder or recycling agent with the optimistic content is improved and can meet the technical requirements. According to the relevant technical standards in “Guidelines for design and construction of asphalt rubber and mixtures in Beijing”, the index of recycled CRMA binder can reach the standard when the content of fresh CRMA binder is 70% or content of recycling agent is 6%. The experimental results show that the recycling of the aged CRMA asphalt is feasible.