1.1. This practice includes recommended terminology for designating RAP stockpiles which indicate the general consistency of RAP material properties within the stockpile and if additional material can be added to the RAP stockpile once testing has been completed. 1.2. Guidelines are provided for stockpiling practices which minimize the variability of material properties within the RAP stockpile. 1.3. Guidance is also provided for RAP stockpile quality control sampling practices, sampling frequency, and applicable test methods which can be used to estimate the variability of RAP aggregate gradations, asphalt binder content, and bulk specific gravities within the stockpile. 1.4. The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.5. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Useful practices for stockpiling recycled materials are needed so that these materials can be more uniformly stockpiled and processed. Improved uniformity is needed so that the variability of the final asphalt mixture can be reduced. Uniform terminology which can be used to indicate the general uniformity of the material in the stockpile and how the stockpile, once built, is maintained is needed to minimize confusion between users and producers when requirements for managing and maintaining supplies of recycled materials. While quality control testing varies considerably between agencies and commercial users, some general guidance is needed for what test method(s) are most useful for defining key recycled material properties. These key properties are needed for asphalt mixture sample preparation, design volumetrics, and asphalt mixture performance testing inputs.
KeywordsRAP variability; RAP stockpiles; RAP quality control
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
Draft Under Development