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Using Noggin Ground Penetrating Radar (GPR) for Bridge & Infrastructure Assessment

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Ground penetrating radar (GPR) can be used for continuous assessment of bridge deck conditions, measuring rebar spacing & cover, and quality control of construction practices.

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Using Noggin Ground Penetrating Radar (GPR) for Bridge & Infrastructure Assessment

  1. 1. Copyright 2017
  2. 2. Copyright Sensors & Software Inc. 2018 Bridges are aging and repair efforts need to be prioritized In the USA: There is a $740 Billion backlog in needed road, highway & bridge improvements.* In 2016, 9.1% of the nation’s bridges were structurally deficient** The average bridge is 43 years old** *Source: AASHTO (American Association of State Highway and Transportation Officials) 2015 Report **Source: American Society for Civil Engineers (ASCE) 2017 Infrastructure report card
  3. 3. Copyright Sensors & Software Inc. 2018 There is a need for cost-effective methods to inspect, monitor & rehabilitate existing structures To prevent catastrophes BEFORE they occur
  4. 4. Copyright Sensors & Software Inc. 2018 Coring provides accurate measurements, but has limitations • Coring is - Destructive - Only provides spot measurements - Locations are picked at random - Is expensive – requiring lane closures, specialized equipment and laboratory analysis • Non-destructive methods are • necessary to provide cost effective • methods to prioritize • rehabilitation efforts
  5. 5. Copyright Sensors & Software Inc. 2018 GPR is recognized as the best Non-destructive testing method for bridge deterioration detection
  6. 6. Copyright Sensors & Software Inc. 2018 GPR provides information useful for: • Continuous assessment of bridge deck condition (not single points) • Rebar spacing & cover • Quality control inspections • Determining core locations • Dowel bar placement
  7. 7. Copyright Sensors & Software Inc. 2018 Position (m)Depth(mm) Asphalt Normal Rebar Response Lower amplitude, Weaker Rebar Response indicates Problem Area GPR can determine problem areas in concrete GPR images into the subsurface to locate areas of high attenuation caused by corrosion and delamination
  8. 8. Copyright Sensors & Software Inc. 2018 Example: GPR used to create bridge deck condition maps (based on ASTM D-6087) 6 Lane Bridge GPR lines per lane = 3 Sampling Interval = 3 cm Total Samples = 54,000 Data Collection Time = < 1 hour Time to Output Map = 1 Day Bridge Deck Condition Map ASTM D-6087 - Standard Test Method for Evaluating Asphalt-Covered Concrete Bridge Decks Using Ground Penetrating Radar
  9. 9. Copyright Sensors & Software Inc. 2018 Example: GPR used to create bridge deck condition maps (based on ASTM D-6087) Example bridge collection, USA Automatically generate PDF reports from EKKO_Project GPR Software
  10. 10. Copyright Sensors & Software Inc. 2018 Example: GPR provides additional bridge structural information Noggin SmartCart used to collect data on a Bridge Approach Slab Data shows: – rebar – dowel bars – joints Approach Slab Joint C15M Rebars Tie BarsDowel Bars Longitudinal Joints Transverse Joint Bridge Deck Rebar Approach Slab Rebar
  11. 11. Copyright Sensors & Software Inc. 2018 Example: GPR provides rebar cover depth for quality inspections GPR scanning showed an area of the bridge where the depth of rebar cover quickly increases more than 2.5 inches over a distance of 5 feet 2.5 inches
  12. 12. Copyright Sensors & Software Inc. 2018 Example: GPR can image vertical supports to assess construction practices Quickly image structural components on vertical supports
  13. 13. Copyright Sensors & Software Inc. 2018 Example: GPR used to detect voids after severe flooding A pier was flooded and GPR was used to locate potential voids to target repair efforts
  14. 14. Copyright Sensors & Software Inc. 2018 Example: GPR used to detect voids after severe flooding With two technicians onsite, a total of 12,500 feet (2.36 miles or 3.8 km) were collected in just 4 hours. Red lines show GPR data collection path.
  15. 15. Copyright Sensors & Software Inc. 2018 Example: GPR used to detect voids after severe flooding Areas of potential voids were clearly identified and the municipality was able to target repairs to the key areas of concern on the pier.
  16. 16. Copyright Sensors & Software Inc. 2018 GPRs can be deployed in many ways … depending on your project needs
  17. 17. Copyright Sensors & Software Inc. 2018 Use GPR to make Informed Infrastructure Decisions • Determine where to core • Rank relative health of bridges to prioritize repair spending • Determine construction practices in existing structures • Identify problem areas for further investigation • Monitor deterioration of structures over time • Perform quality assurance on new build or repair work Subsurface Data Interpretation Knowledge Informed DecisionsVALUE INFORMATION Subsurface Data Interpretation Knowledge Informed Decisions
  18. 18. Copyright Sensors & Software Inc. 2018 Use GPR for your infrastructure projects • GPR provides detailed structural information quickly • GPR is cost-effective • GPR is easy to learn
  19. 19. Copyright Sensors & Software Inc. 2018 Training Provided by Sensors & Software • Customized training at your facility • Regular courses at Sensors & Software • Personalized webinars for your team • Free On-Demand training
  20. 20. Copyright Sensors & Software Inc. 2018 Online Resources Newsletters Case Studies EKKO_Project software tutorials
  21. 21. Copyright Sensors & Software Inc. 2018 Want to learn more? We would be happy to discuss how you can incorporate GPR into your bridge and infrastructure assessment projects. Schedule a lunch & learn session today! Sensors & Software Inc. 1040 Stacey Court Mississauga, Ontario Canada L4W 2X8 Office: +1 905 624 8909 www.sensoft.ca Contact Us

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