Typical Asphalt Shingle Composition
The use of RAS in HMA can significantly lower production costs by substituting RAS for virgin binder up to 5% per TxDOT specifications. Using the proper amount of RAS allows the producer to "grade dump" and use a lower cost binder. RAS can help save upwards of 2% per ton.
RAS makes an inexpensive road surface. It will not sink like aggregate, is quiet and performs much like asphalt for a fraction of the cost.
An example of poor drainage on a base road. Aggregates have been replaced, but once again they are beginning to sink below grade.
The solution is RAS. Low spots have been filled and now prevents the buildup of mud. RAS provides a hard surface that repels water.
RAS has been a proven dust control material for many years. Graded, but not rolled out, RAS has been proven to stabilize the roadbed for up to two years.
Notice the dusty road on the left? There are two trucks. The road on the right is paved with RAS.
Here is the same location in 2018. It has been two years and the road is performing very well.