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INTERIM REPORT FOR
KHIT 2013-14 CLARK COUNTY US 60 PAVEMENT, STORM SEWER &
UTILITY INVESTIGATION
Introduction The Kentucky Transportation Cabinet (KYTC) contracted the Kentucky Transportation Center
(KTC) to provide a pavement, storm sewer and utility investigation for the US 60 Pavement Rehabilitation Project (Item No. 07-2044.00) in Clark County. The purpose of the pavement investigation was to determine the depth of the Asphalt Concrete overlay and the depth of the Portland Cement Concrete. The following report contains the results of the pavement investigation.
Methodology KTC utilized Ground Penetrating Radar (GPR) technology to determine the depths of the
pavement along the route. Each lane was scanned along two different paths using a 1600 MHz antenna. The radar signal and the associated distance was recorded every one inch along the lane. The first path, GPR Path “A”, was taken nine feet from the right edge of the lane and the second scan, GPR Path “B”, was performed five feet from the right edge of the lane (see Diagram 1).
Diagram 1: Radar Paths for Each Lane
A total of six lanes were scanned for the project using GPR. All scans were performed in the respective lanes direction of travel. The middle turn lane was scanned going ahead station. Diagram 2 below identifies each lane with a lane number. The lane number also corresponds to the figures in the “Results” section of this report. The lanes with GPR results and the respective mainline station extents are as follows:
1. Eastbound Lane: Mainline Station 50+00 to Mainline Station 155+00 2. Westbound Lane: Mainline Station 50+68 to Mainline Station 155+00 3. Eastbound Right Turn Lane: Mainline Station 50+00 to Mainline Station 54+68 4. Westbound Right Lane: Mainline Station 50+68 to Mainline Station 54+82 5. Middle Turn Lane: Mainline Station 52+65 to Mainline Station 130+60 6. Westbound Right Turn Lane: Mainline Station 51+50 to Mainline Station 53+50
Diagram 2: Lanes Scanned with GPR
After the data was collected calibration cores were taken in each lane. In-situ pavement thicknesses were measured and used for calibrating the data for the analysis. A total of five cores were taken for calibration. Two cores were taken in the eastbound and westbound lanes each and one core was taken in the middle turn lane.
Analysis All data was post processed in the office. The bottom of all visible pavement layer types were
identified by hand within the analysis software. The pavement depth measurements from the cores were used to calibrate the depth measurements in the analysis software. All data was exported into Microsoft Excel to display in graph form. A correction factor was applied to the distance measurements to account for the expected error in the DMI. The error in the DMI was determined to be less than one percent.
Results Each graph shows the pavement depth for a lane along a particular path. The horizontal axis references the mainline station in feet. The vertical axis is the depth measured in inches from the surface of the pavement to the bottom of the pavement layer type. The list of figures is as follows:
Figure 1a: Eastbound Lane - Path “A” Figure 1b: Eastbound Lane - Path “B” Figure 2a: Westbound Lane - Path “A” Figure 2b: Westbound Lane - Path “B” Figure 3a: Eastbound Right Turn Lane - Path “A” Figure 3b: Eastbound Right Turn Lane - Path “B” Figure 4a: Westbound Right Lane - Path “A” Figure 4b: Westbound Right Lane - Path “B” Figure 5a: Middle Turn Lane - Path “A” Figure 5b: Middle Turn Lane - Path “B” Figure 6a: Westbound Right Turn Lane - Path “A” Figure 6b: Westbound Right Turn Lane - Path “B” All figures are set to print on 11” x 17”
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Figure 1a: US 60 Clark County ‐ Pavement Depths ‐ East Bound Lane ‐ Path "A"
Bottom of Asphalt Bottom of Concrete
Example ofFullDepthAsphalt
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Figure 1b: US 60 Clark County ‐ Pavement Depths ‐ East Bound Lane ‐ Path "B"
Bottom of Asphalt Bottom of Concrete
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Figure 2a: US 60 Clark County ‐ Pavement Depths ‐West Bound Lane ‐ Path "A"
Bottom of Asphalt Bottom of Concrete Bottom of Concrete Overlay
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Figure 2b: US 60 Clark County ‐ Pavement Depths ‐West Bound Lane ‐ Path "B"
Bottom of Asphalt Bottom of Concrete Bottom of Concrete Overlay
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Figure 3a: US 60 Clark County ‐ Pavement Depths ‐ East Bound Right Turn Lane ‐ Path "A"
Bottom of Asphalt
Could not determine asphalt depth between Sta. 51+90 to Sta. 52+09.
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Figure 3b: US 60 Clark County ‐ Pavement Depths ‐ East Bound Right Turn Lane ‐ Path "B"
Bottom of Asphalt
Could not determine asphalt depth between Sta. 51+90 to Sta. 52+09.
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Figure 4a: US 60 Clark County ‐ Pavement Depths ‐West Bound Right Lane ‐ Path "A"
Bottom of Asphalt Bottom of Concrete Overlay
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Figure 4b: US 60 Clark County ‐ Pavement Depths ‐West Bound Right Lane ‐ Path "B"
Bottom of Asphalt Bottom of Concrete Overlay
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Figure 5a: US 60 Clark County ‐ Pavement Depths ‐Middle Lane ‐ Path "A"
Bottom of Asphalt Bottom of Concrete
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Figure 5b: US 60 Clark County ‐ Pavement Depths ‐Middle Lane ‐ Path "B"
Bottom of Asphalt Bottom of Concrete
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Figure 6a: US 60 Clark County ‐ Pavement Depths ‐West Bound Right Turn Lane ‐ Path "A"
Bottom of Asphalt
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Figure 6b: US 60 Clark County ‐ Pavement Depths ‐West Bound Right Turn Lane ‐ Path "B"
Bottom of Asphalt
