Standard Specification for
Stone Matrix Asphalt (SMA)
AASHTO Designation: M 325-08
1.1.This specification covers the design of Stone Matrix Asphalt (SMA) using the Superpave Gyratory Compactor (SGC).
The SMA design is based on the volumetric properties of the SMA in terms of air voids ( V,,), the voids in mineral aggregate (VMA),
and the presence of stone-on-stone contact.
1.2.This standard specifies minimum quality requirements for asphalt binder, aggregate, mineral filler, and stabilizing additives for SMA mixture designs.
1.3.The values stated in SI units are to be regarded as the standard.
The U.S. Customary units in parentheses are for information only.
1.4.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.
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