(Interim)
Procedure:
1. Determine the thickness of conventional DGAC required for the
structural needs of the pavement (based on deflections and structural
section stiffening using current Caltrans procedures).
2. Determine the thickness of conventional DGAC required to retard
reflection cracking (using current
Caltrans procedure).
3. Select a DGAC overlay thickness that satisfies the requirements
of 1 and 2 above.
4. Use either Table 1 or Table 2 to determine the ARHM-GG equivalent
sections, with and/or without SAMIs. Use Table 1 if structural
needs control and Table 2 if reflection crack retardation controls.
5. If the ride score of the pavement to be rehabilitated is greater
than the allowable maximum and there is no structural need per
I above, select one of the following:
a) Place two 0. 10' thick lifts of ARHM-GG or
b) Cold plane to a depth of 0. 10', then place ARHM-GG as determined
per Steps 1 thru 4 above.
Structural Equivalencies
Thickness
(ft.)
Notes:
1 . The maximum allowable non-experimental equivalency for ARHM-GG
is 2: 1.
2. The minimum allowable ARHM-GG lift thickness is 0. 10'.
3. Place 0. 15' of new DGAC first.
4. Place 0.20' of new DGAC first.
5. ARHM-GG may not prevent cold weather induced transverse cracks.
Reflection Crack Retardation Equivalencies
Thickness
(ft.)
Notes:
1. The minimum
allowable ARHM-GG lift thickness is 0.10'.
2. A DGAC thickness of 0.35' is the maximum thickness recommended
by Caltrans for reflection crack retardation.
3. Use 0. 15 if the crack width is <1 /8" and 0.20 if
the crack width is >1 /8".
4. Use if the crack width is >l /8". If <1 /8",
use another strategy.
5. ARHM-GG may not prevent cold weather induced transverse cracks.