1. The Nuts and Bolts of Thermal Profiling with Pave-IR

2.  TxDOT Spec:  One profile per sublot  Engineer may reduce testing frequency  Engineer may also obtain as many thermal profiles as deemed necessary  Tex-244-F profiled 150 feet of paving  Essentially Pave-IR profiles each 150 foot segment of paving

3.  Automated data processing methods selected to mimic structure of existing Tex-244-F  Remember the primary goal of testing  Detect thermal signatures in the placement operation such as  Truck Ends  Streaks  Random cold spots within truckloads

4.  Excludes the outer 2 feet toward the edges  Determines “maximum baseline temperature” in first 20 feet of paving  This temperature will generally not be the absolute maximum from within a profile’s limits  This approach reduces the contractor’s risk  Tex-244-F determines the minimum profile temperature over 150 feet  Locations of paver stops > 10 sec. excluded from analysis

5.  Must ignore outer 2 ft toward edges  Must mimic risk structure in terms of leniency on the “maximum” temperature  Must ignore paver stops  Must not produce false positives  Must automatically process data

6.  Sensors to ignore selected prior to initiating data collection  In most cases these are the outer 2 sensors on each side  Pave-IR stores which sensors to ignore, and reports which sensors were not used in the temp. differential determination

7.  Researchers manually evaluated 380 profile segments  The hottest spot in the first 20 ft is typically 98.5% of the hottest spot in the entire profile segment Pave-IR ignores 1.5% of the hottest temperatures to determine the maximum baseline temperature

8.  Paver stop defined as > 10 seconds idle time  Reviewed over 30 paver stops from 4 different projects  Ignore 2 ft prior to stop  Ignore 8 ft after stop  Using this approach eliminated irregular thermal signatures attributable to the paver stops in all cases examined

9. Red bars beneath profile are limits ignored due to paver stop.

10.  External factors could create artificial cold spots in data log files  Hand work, cooler spills Artificial cold spot from hand work

11.  A “single point” approach for determining the minimum profile temperature would artificially inflate the temp. differential when these external factors are present in a profile Pave-IR ignores the coldest 1% of temperatures to determine the minimum profile temperature

12.  Operator selects which sensors are within 2 ft of edges. These sensors are ignored from calculations  For each 150 ft segment  Data 2 ft prior, and 8 ft after paver stops lasting > 10 seconds are ignored  Omit hottest 1.5% of measurements to determine maximum baseline temperature  Omit coldest 1% of measurements to determine minimum profile temperature  Profile temp. differential = max - min

13.  Pave Project Manager (PPM) allows for automated reporting and manual data review

14.  Opening a data file  Changing the color map scale  Viewing the thermal profile  Scrolling through the profile  Profile view options  Ignored sensors and profile length  Tooltip and spots of interest  Properties, Time, Speed, and Temperature Class Diagrams  Illustration with 2 project files

15.  Texas – 15 Units  Other users:  Minnesota  Wisconsin  NCAT  Other interested regions:  Alaska  Quebec  Ohio  Michigan  Germany  China

16. Moba Corporation Paul Angerhofer 678-817-9646 770-634-0058 (cell) p.angerhofer@moba.de Moba Corporation James Lano 678-817-9646 678-557-0951 (cell) jlano@moba.de Moba Corporation Gary Motak 678-817-9646 770-842-1579 (cell) g.motak@moba.de