Structural Condition Assessment of Dam Facilities with Non-Destructive Evaluation Methods
Recorded on January 10, 2012 (120 minutes)

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The webinar will discuss the basics of various non-destructive evaluation (NDE) methods and their applications for investigating dam, spillway and conduit conditions such as freeze-thaw cracking, void, seepage, corrosion of reinforcing, anchor bolts, strength/moduli, and stability.  Guidance will be provided as to which NDE methods are useful for diagnosing various conditions of concrete, masonry, earthen and steel materials.  The webinar will highlight the important aspects of each phase from planning of NDE investigations and the basics of the NDE methods in terms of testing and analysis. 

Larry D. Olson, P.E., President and Principal Engineer, Olson Engineering, Inc., and Olson Instruments, Inc.

Larry D. Olson, P.E., is nationally and internationally known for his expertise in nondestructive evaluation and performance monitoring of civil infrastructure including dams, bridges, buildings, foundations, pavements, tunnels, etc.  He is a member of several committees including:  ASCE’s Geophysics Committee, Transportation Research Board (TRB) Committee AFF40 on Field Testing and Nondestructive Evaluation of Transportation Structures and its Nondestructive Evaluation (NDE) subcommittee as well as the Earth Exploration Committee AFP20 and its Geophysical subcommittee.  He has been an instructor in the American Society of Civil Engineers seminar on “Structural Condition Assessment of Existing Structure” since 1997 and in 2009 developed a new ASCE seminar “Bridge Condition Assessment and Performance Monitoring”.  He was the primary instructor in an Engineering Education of Australia seminar series on Nondestructive Evaluation of Concrete, Asphalt and Wood in Sydney and Melbourne in 2010.  He is a member of the American Concrete Institute Committees 228 Nondestructive Testing, 309 Consolidation and 342 Bridge Evaluation and a technical affiliate of the Association of Drilled Shaft Contractors.  Mr. Olson is past Chairman of the Evaluation Committee of the International Concrete Repair Institute (2002-2009) and a past ICRI board of directors member.  He has over 31 years of consulting experience in structural condition assessment and monitoring, materials, pavement, geotechnical, geophysical, and vibration engineering.  He holds BS and MS Geotechnical Engineering degrees from the Civil Engineering Department of the University of Texas at Austin which honored him as a distinguished alumnus in 2006.  Olson Engineering has its main office in Wheat Ridge CO with branch offices in Manassas VA, Rutherford NJ and Socorro NM.

Webinar Agenda

  1. Introduction to Dams and NDE Methods
    1. Dam conditions to be diagnosed with NDE
      1. Concrete/Masonry Cracking, Thickness and Integrity
      2. Subgrade support of spillways and conduits
      3. Steel reinforcing and anchors corrosion/integrity/location
      4. Seismic property determination for earthquake analyses
      5. Slope stability monitoring
    2. NDE Method Basics
      1. Stress Waves (Ultrasonic, Sonic and Seismic)
      2. Electromagnetic Waves (Radar)
      3. Electro-chemical (Corrosion)
    3. NDE References
      1. International Concrete Repair Institute NDE Guideline Document
      2. American Concrete Institute 228 Nondestructive Testing Strength and Evaluation documents
  2. Case Histories - Concrete and Masonry Dam Condition Assessment with NDE
    1. NDE for Cracking Damage in Dams and Spillways
      1. Impact Echo for near-surface cracking including corrosion damage
      2. Surface Waves for distributed cracking (freeze-thaw, ASR)
      3. Cross Dam Sonic Tomography for imaging joints/cracking damage
    2. NDE for Evaluation of Spillway and Conduit Conditions
      1. Impact Echo for thickness/integrity
      2. Surface Waves for concrete/rock/subgrade velocity/modulus
      3. Slab Impulse Response for void/subgrade support
      4. Ground Penetrating Radar for void/subgrade support and rebar maps
  3. NDE for Steel Conduit/Steel Reinforcement Corrosion
    1. Ultrasonic Testing (Pulse Echo) for Steel Conduits and Anchor Bolts
    2. Reinforcement Corrosion Assessment with Half-Cell, Concrete Resistance and Galvanostatic Pulse methods
  4. Geophysical Methods for Seismic Analyses and Embankement/Dam Monitoring
    1. Seismic Methods for Earthquake Analyses
    2. Radar for displacement monitoring of concrete/earthen dam stability
  5. NDE Application Guideline for Dams