442 Superpave Asphalt Concrete

Description (442.01)

This item is a mix design specification utilizing a gyratory compactor to produce an asphalt concrete that is used for an intermediate or surface course. Known as Superpave, this asphalt concrete is used for higher traffic routes and can be either a 446 or 448 asphalt concrete pavement. Superpave mix design requires the use of special equipment, material properties, and design procedures. Superpave asphalt concrete requires inspection and documentation as per the requirements of 401 and 446 or 448.


Acceptance (442.07)

Superpave items are accepted per 448 or 446 requirements. See those items for details.


Documentation Requirements - 442 Superpave Asphalt Concrete

1.      Obtain the approved JMF for the project.

2.      Determine and document if paver is on approved list.

3.      Document pavement surface condition, preparation, and surface and air temperatures.

4.      Document tack or prime used, along with source and quantity used, versus required.

5.      Check and document roller capacities as outlined in 401.13, if required by the specification item.

6.      Document lift thickness, mat width, weather conditions, surface tolerance checks, equipment problems, mat problems (segregation, tearing, tenderness, etc.), spreading rate, roller coverage, and any other issues or observations made during paving operations.

7.      Observe and document trucks hauling material.

a.       Check for secured waterproof cover.

b.      Check for insulated truck beds for temperatures below 50 F (10 C) and/or if the haul exceeds 20 miles (32 km).

c.       Observe the asphalt mix in the truck and note any slumping, drain down, or blue smoke.

8.      Determine compliance with compaction requirements as per 401.16.

9.      Record asphalt mixture temperatures in the paver hopper and on the mat at the time of compaction.

10.  Determine and record required and actual placement rates and variance.

11.  Write location (station), date, and time on asphalt plant tickets. Tickets should be totaled daily and initialed with the calculator tape attached.

12.  Take samples, cores, or density readings as required by items 446 or 448.

13.  Record luminance readings for night paving operations.

14.  Determine plan quantity for payment.

15.  Document on CA-FP-2 through 4 or other approved forms as needed.