Asphalt and Granular Thickness - Sensors & Software
close X
Nav Menu
 
Asphalt and Granular Thickness
P

avement structure data on the CPATT (Centre for Pavement and Transportation Technologies) test road at the University of Waterloo was acquired at speeds of 40 to 80 km/h (30 to 50 mph). The SmartTrailer configuration enables rapid acquisition of surface coupled GPR. All data were collected using a vehicle odometer at a user-defined spatial interval. DMI and GPS provide precise positioning.

Using the integrated GPS data, the CPATT test road is marked in red and yellow on the Google Earth map below.

Google Earth map showing the 700 m long CPATT test road.
Figure 1:
Google Earth™ map showing the 700 m long CPATT test road.

The below figure shows a 100 m section of data (yellow line in the Google Earth map above). The section shows asphalt over granular, above the subgrade. The asphalt-granular and granular-subgrade boundaries are clearly visible. A short section of thicker asphalt (Asphalt 2) is evident between 360 m and 364 m.

Interface depths for the CPATT road. The corresponding GPR data section from 300m to 400 m is shown above.
Figure 2:
Interface depths for the CPATT road. The corresponding GPR data section from 300m to 400 m is shown above.

The data in the cross-section are a subset of the full 700 m CPATT test road. RoadMap automated horizon analysis generated  for the full test road are shown above.

GPR travel times were converted to depth by calculating velocities from feature responses in the data itself, and by correlating with core thickness data. An example of a layer thickness summary report is shown in  the table below.

LAYERS AVERAGE THICKNESS (mm) STANDARD DEVIATION (mm) NUMBER OF MEASUREMENTS
Asphalt 1 97 5 3376
Asphalt 2(360–364 m) 142 3 18
Granular 592 67 3146
Table 1
Layer thickness statistics

Download the case study: Asphalt and granular thickness

Learn more about Noggin® GPR

Get in touch with us

  • Please enter your first name

  • Please enter your last name

  • Please enter your email address

  • Please do not change this field
 
 

 
FacebookLinkedInTwitterGoogle+Email