April 2026 Newsletter - Recycled Binder Availability (RBA)

How much binder are we truly getting from RAP in today’s mixtures? And how relevant is that contribution in modern mix design? As agencies continue to adopt higher RAP contents, questions remain about the contribution of aged binder from RAP. RAP contains binder that is commonly assumed to partially blend with virgin binder, and concepts such as Recycled Binder Availability (RBA) are used to estimate how much of this binder is effectively active in the mixture. As RAP usage increases and...