Data Collection and Analysis Summary for Rubber Mix Project

Collection of dielectric data for different depths and locations on Interstate 295 and Route 201 in Portland and Moscow. Distribution curves and calibration findings revealed deviations in dielectric values at various depths on different dates. Further analysis required to determine the next steps for the project.

• Data Collection
• Dielectric Data
• Distribution Curves
• Calibration Findings
• Rubber Mix Project

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1. DPS GPR 2021 DATA Ulrich Amoussou-Guenou

2. SUMMARY Summary of data collected Distribution Curves Rubber Mix project: 12.5mm NMAS - WMA 1-3/4 Mill & Fill (Night Work): 0.53 miles collected on Interstate 295 Southband in Portland 9.5 mm Mix HMA 1-1/4 Overlay (Day Work): 0.85 miles collected on Route 201 Northbound lane in Moscow Contour Map Rubber Mix Calibration Curves Findings What next

3. Dielectric -1ft RT Dielectric -3ft RT Dielectric -5ft RT Dielectric -7ft RT Dielectric -9ft RT Dielectric -11ft RT 3000 (5.09; 0.15) 5.03; 0.15 (5.08; 0.19) (4.81; 0.16) (5.03; 0.15) 2500 (5.21; 0.22 Std Data Mean Deviation 0.160 0.153 0.215 0.189 0.149 0.150 0.149 0.215 2000 4.812 5.032 5.211 5.084 5.091 5.029 4.812 5.211 Dielectric - 1ft RT Dielectric - 3ft RT Dielectric - 5ft RT Dielectric - 7ft RT Dielectric - 9ft RT Dielectric - 11ft RT Minimum Maximum Count 1500 1000 500 0 4.3 Distribution Curves of Dielectric Data Collected on August 25th, 2021 Portland - South Portland I 95 Southbound - Travel Lane - Sta 284+00 to Sta 312+00 4.2 4.4 4.5 4.6 4.7 4.8 4.9 5 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 6

4. 2500 Dielectric - 1ft RT Dielectric - 3ft RT Dielectric - 5ft RT Dielectric - 7ft RT Dielectric - 9ft RT Dielectric - 11ft RT 2000 Std Data Mean Deviation Dielectric - 1ft RT Dielectric - 3ft RT Dielectric - 5ft RT Dielectric - 7ft RT Dielectric - 9ft RT Dielectric - 11ft RT Minimum Maximum 5.312 5.354 5.381 5.425 5.394 5.245 5.245 5.425 0.134 0.133 0.115 0.136 0.117 0.133 0.115 0.136 1500 Count 1000 500 0 4.5 Distribution Curves of Dielectric Data Collected on September 16, 2021 Moscow Route 201 Northbound Lane Sta 81+00 to Sta 111+00 4.6 4.7 4.8 4.9 5 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 6

5. Dielectric - 0.5ft RT Dielectric - 1ft RT Dielectric - 2.5ft RT Dielectric - 3ft RT Dielectric - 4ft RT Dielectric - 4.5ft RT Dielectric - 5ft RT Dielectric - 6ft RT Dielectric - 7ft RT Dielectric - 8ft RT Dielectric - 9ft RT Dielectric - 11ft RT 1200 1000 800 Count 600 400 200 0 4.5 Distribution Curves of Dielectric Data Collected on September 17, 2021 Moscow Route 201 Northbound Lane Sta 160+00 to Sta 175+00 4.6 4.7 4.8 4.9 5 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 6

6. Dielectric 0.5ft RT Dielectric 1ft RT Dielectric 2.5ft RT Dielectric 3ft RT Dielectric 4ft RT Dielectric 4.5ft RT Dielectric 5ft RT Dielectric 6ft RT Dielectric 7ft RT Dielectric 8ft RT Dielectric 9ft RT Dielectric 11ft RT 3000 (5.36; 0.14) (5,40; 0.14) (5.34; 0.14) 2500 (5.30; 0.15) (5.17; 0.17) (5.21; 0.20) 2000 Count 1500 1000 500 (5.12; 0.11) (5.22; 0.15) (5.06; 0.13) (5.40; 0.14) (5.25; 0.16) (5.37; 0.18) 0 4.5 Distribution Curves of Dielectric Data Collected on September 16 & 17, 2021 Moscow Route 201 Northbound Lane Sta 81+00 to Sta 111+00 & Sta 160+00 to Sta 175+00 4.6 4.7 4.8 4.9 5 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 6

7. Dielectric 12 5.800 5.683 10 5.567 5.450 8 5.333 Lateral Offset 5.217 Paver Stops Sta 299+70: 1min 47s Sta 306+13: 25min 30s 6 5.100 4.983 4 4.867 4.750 2 4.633 4.517 Center Line Joint 0 4.400 28400 Contour Map of Dielectric Data Collected on August 25th, 2021 Portland - South Portland I 95 Southbound - Travel Lane Sta 284+00 to Sta 312+00 28900 29400 29900 30400 30900 31400

8. Dielectric 12 5.800 5.683 10 5.567 5.450 8 5.333 Lateral Offset 5.217 Paver Stops Sta 306+13: 25min 30s 6 5.100 4.983 4 4.867 4.750 2 4.633 4.517 Center Line Joint 0 4.400 30400 Contour Map of Dielectric Data Collected on August 25th, 2021 Portland - South Portland I 95 Southbound - Travel Lane Sta 284+00 to Sta 312+00 30500 30600 30700 30800 30900

9. Rubber Mix Pucks Calibration Moscow Rte 201 - 9.5 mm mix Pucks Calibration 15.5 16.5 15.5 14.5 62mm Pucks 62mm Pucks 14.5 y = -12.285x + 71.828 R = 0.9779 13.5 y = -13.753x + 77.451 R = 0.9927 115mm Pucks 115mm Pucks 13.5 Percent Airvoid Percent Airvoid 12.5 Linear (62mm Pucks) 12.5 Linear (62mm Pucks) 11.5 11.5 Linear (115mm Pucks) Linear (115mm Pucks) 10.5 10.5 9.5 9.5 8.5 8.5 7.5 7.5 y = -14.287x + 79.382 R = 0.9043 y = -10.766x + 62.867 R = 0.8271 6.5 6.5 5.5 5.5 4.5 4.5 3.5 4.6 4.65 4.7 4.75 4.8 4.85 4.9 4.95 5 5.05 5.1 5.15 5.2 5.25 5.3 5.35 5.4 5.45 5.5 4.4 4.45 4.5 4.55 4.6 4.65 4.7 4.75 4.8 4.85 4.9 4.95 5 5.05 5.1 5.15 5.2 5.25 5.3 5.35 5.4 Dielectric Dielectric

10. Comparison between core density and density using pucks calibration equation Air Voids (%) using calibration equation Density (%) using calibration equation Density (%) Acceptance Core Test Location Core Density Measured Dielectric Offset Core 1 95+92 3.2 RT 93.6 5.33 4.1 95.9 2.3 Core 2 164+87 4 RT 93.3 5.13 6.9 93.1 -0.2

11. FINDINGS 1. Lower dielectric and slightly wider range for the 12.5 mm rubber mix project (Mean 5.04, Std dev: 0.21) vs. (Mean: 5.35, Std dev: 0.14) for the 9.5 mm standard mix. Which suggest a more uniform compaction pattern for the second project. (2 knock down rollers used for the first project vs 1 knock down roller for the second project). 2. Lowest values close to the joints even though confined (centerline joint: 1-ft and shoulder: 11-ft) and highest values in the middle of the lane. Typically, with 2 knock down rollers the highest values are in the wheel path (3-ft and 9-ft offset). 3. Too much variability in the rubber mix data calibration (Almost 0.2 in the 62.4 mm thick pucks and nearly 0.1 in the 115 mm pucks) for the same airvoid. It is suspected that a nearby radio room is affecting the readings. 4. The 115 mm samples calibration seem to be more accurate compared to the 62.4 mm for both projects. This was expected. 5. The pucks calibration doesn t seem to align with the field dielectrics. 6. The paver stops locations on the contour map indicate low dielectric values.

12. WHAT NEXT 1. Confirm the interference of radio signal on the rubber mix pucks calibration due to the proximity of a radio room to the room where the calibration was done for the rubber mix specimen. 2. Confirm that the 115 mm thickness in the way to go (compared to the 62.4 mm). 3. Establish the correlation between the cores calibration and the pucks calibration . 4. Find the minimum pavement thickness that allow or guaranty valid dielectric data collection in the field. 5. Use the RDM survey in conjunction with others new technologies such as pave IR for complementarity and correlation.

13. Thank you for your attention