Type I (fine). This type has the finest aggregate gradation (most are smaller than the 2.36 mm (No. 8) sieve) and is used to fill small surface cracks and provide a thin covering on the existing pavement. Type I aggregate slurries are sometimes used as a preparatory treatment for HMA overlays or surface treatments. Type I aggregate slurries are generally limited to low traffic areas (ISSA, 2001a[1]).