Designing a program to recycle bituminous pavements has two steps: (1) restoration of durability and desirable consistency to the aged asphalt, and (2) calculation of a proper mix design by use of easily obtained information. In designing a program it must be decided whether to recycle hot or cold and in-place or off-site and what equipment to use for processing. The following design procedure is applicable to whatever technique selected.

DESIGN PROCEDURE
The main requirements for a practical design are:
1. Determining the composition and properties of the reclaimed asphalt concrete (RAP),
2. Establishing the shortcomings of the RAP, for example, why it cannot be used as such, and why the pavement has failed,
3. Deciding which and how much recycling agent must be added, and
4. Predicting the effects attainable.

Using this information, the engineer can proceed with preparing his design. Some engineering judgment on the job will always be required, as in the case in any construction job.


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