Stone Mastic Asphalt - an overview | ScienceDirect Topics
George C. Wang, in The Utilization of Slag in Civil Infrastructure Construction, 2016 10.3.2.6 Stone mastic (matrix) asphalt. SMA is a relatively thin (12.5–40 mm) gap-graded, densely compacted, HMA that is used as a surface course on both new construction and surface renewal.It is a mixture of asphalt cement, coarse aggregate, crushed sand, and additives.