Intelligent Compaction and Pave-IR in Minnesota NCAUPG Technical Conference February 16, 2012 Greg Johnson Mn/DOT Asst. Bituminous Engr.
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1 Intelligent Compaction and Pave-IR in Minnesota 2012 NCAUPG Technical Conference February 16, 2012 Greg Johnson Mn/DOT Asst. Bituminous Engr.
2 Intelligent Compaction (Video)
3 MnDOT Intelligent Compaction Projects 2004 District 3, Mn/ROAD, Demo 2005 District 1, US 53, Duluth, Granular (Taconite) District 7, US 14, Janesville, Non-Granular, Granular District 8, US 12, Atwater, Base 2006 District 2, TH 64, Bemidji, Granular 2008 (cont) 2010 District 3, Mn/ROAD, Misc Non-Granular Metro District, I-494 Valley Creek Road, Granular Shoulders 2007 District 3, US 10, Staples, Granular District 4, US 10, Detroit Lakes, Non-Granular, Granular District 7, TH 60, Worthington, Non-Granular, Granular Metro District, TH 36, St. Paul, Non-Granular, Granular 2008 Olmsted County, CSAH 2, Non-Granular, Base Kandiyohi County, CSAH 4, Base, HMA (Breakdown) Kandiyohi County, CSAH 40, HMA (Breakdown) District 3, Mn/ROAD, Non-Granular, Granular, Base, Base, FDR, SFDR District 7, TH 60, Worthington, Non-Granular, Granular District 8, TH 71, Wilmar, HMA (Breakdown) District 3, TH169, Garrison, HMA (Breakdown) District 7, TH 13, Albert Lea, HMA (Breakdown) District 6, TH16, Hokah, SFDR Metro District, TH 610, Granular Olmsted County, CSAH 10, Granular (Compactor Rejected) 2011 Total IC Projects = 25 Metro District, TH35, HMA (Pneumatic, Vibratory) District 7, TH 30, Amboy, FDR, SFDR (Padfoot) District 7, TH 83, Waldorf, FDR (Padfoot) District 8, TH 212, FDR (Padfoot) District 8, TH 23, Granular (Compactor Rejected)
4 Mn/DOT Priorities Uniform Compaction -All rollers in a train having a display showing # of passes (GPS) Uniform Temperature -Surface Temperature behind Screed (Pave-IR)
5 1989 Effect of Compaction on Asphalt Concrete Performance Each 1% increase in air voids (over 7 percent) tends to produce ~10 percent loss in pavement life (~1 year less life)
6 IC Roller Components GPS Tracking Roller Settings Surface Temperature Accelerometer Dedicated IC Roller Retrofit IC Rollers Operator Display
7 Roller Number of Passes
8 Frequency SP (TH35) IR3511 Filtered: 11 impacts/foot 50 Frequency (Hz) Average Frequency Minimum Frequency Maximum Frequency Date SP (TH35) CC722 Filtered: 9 impacts/foot Frequency (Hz) Date
9 Amplitude (mm) Amplitude SP (TH35) IR3511 Filtered: Date Amplitude (mm) Average Amplitude Minimum Amplitude Maximum Amplitude SP (TH35) CC722 Filtered: Date
10 TH 169 View of Roller Output IC Roller Track Passes
11 What is Involved Training Computer Equipment Compactor Placement Data Transfer Base Station / Repeaters Preparation Pneumatic Vibratory Steel
12 Example of Large Data Volume from our 2011 Asphalt IC Project Miles 3 Compactors 11,207 Export Files 17,271,460 Rows (Raw Data) 7,750,844 Rows (Valid Data) Not including Temperature Bar Data Massive Amounts
13 File Characteristics Daily Data Submittal (Contractor) Raw Data File dbase Data File Cloud Agency Non-Proprietary Viewing Software Veda ArcGIS Proprietary Software Storage Database Oracle Microsoft Access (Not Recommended)
14 Challenges/Solutions Incorrect Coordinates NB Lane SB Lane SB Ditch Median Use VRS System for coordinates. Eliminate base stations.
15 Challenges/Solutions Not Turning Off the GPS System Plant Site TH Implement Better QC Requirements County Road
16 Compaction Measurement Value (CMV) differences (same time/location) IR3511 CMV Pass IR3511 CC CC Hz 0.93 mm 54 Hz 0.80 mm No standardization or calibration of compactive energy Influences: direction, temperature, weight, speed, etc. 9/1/2011 8:55 to 9:05 PM
17 Benefits of Intelligent Compaction - Contractor Real-time feedback to operators Coverage Prevent Gaps between passes Compaction Curves Number of Passes Identify Weak Areas View Temperature Operator accountability GPS System Transferrable
18 Benefits of Intelligent Compaction Agency Improved uniformity better performance/longevity Increase information better QC/QA Decreased maintenance Decreased sampling/testing (taking cores) Shortcomings of density acceptance process Limited number of locations After compaction is complete
19 Pave-IR Purpose Promote more uniform, higher quality pavements WADOT, NCAT, And TTI found thermal uniformity useful for detecting segregation. A segregated mat increases the contractor s chances of QC/QA core being in a poor/low density area. A segregated mat increases agency s risk of early distress
20 What will this technology do for you? Identify in real time if you have temperature segregation related issues due to: End of truck Streaks paver/plant adjustments Random small clumps Production temperature
21 MOBA Pave-IR 12 sensors spaced 1 foot apart, reading interval = every 6 inches
22 330 F Left Direction Screed 200 F Right 12 individual sensors (rows) 6 inch reading interval Paver Speed
23 Duration 4 hr 30 min Paver Stops Total 1 hr 25 min Avg. Paver Speed 36 ft./min Surface Temp
24 Production Temperature Change 235 F WMA 275 F WMA Paver Stops
25 1000 feet Cyclic End of Truckload Thermal Segregation Paver Speed
26 Paver Stop Temperature Differential
27 Temperature Characteristics 2011 Mill & Overlay on TH 35 May June (Produced at Plant A) Max. as high as 380 F Mean 313 F August September (Produced at Plant B) Min. 200 F Mean 268 F
28 Comparison to Texas Thermal Spec Summary # of 150 foot profiles = 3448 May June 1491 profiles 70% Moderate (25-50 F) 27% Severe (> 50 F) August September 1957 profiles 52% Moderate (25-50 F) 18% Severe (> 50 F)
29 Pave-IR Benefits Real-time feedback to the contractor so needed changes can be made Tracks placement characteristics (paver speed, stops, temperature) Collects where low/high temperature regions are located Improves pavement quality and performance
30 Putting it Together Screed Temp Pass Count- Density Behind Screed Temperature =272 F Lot Density = 95.3% 9/8/ :20 PM 4 passes CC722 10:42 PM 4 passes 3105 X= y=
31 Conclusion IC and Pave-IR together can provide: Feedback and control of the paving process Increase uniformity of mix placement and compaction Increase the performance of our pavements Ability to decrease the amount of QC/QA testing needed Proof of quality placement and compaction Increased accountability
32 TH 18 (169) Elk River, 1920 s Thank You
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