WS3 - Nondestructive Evaluation Methods for Historic Structures Workshop, Part 1
Saturday, September 22
8:00 AM - 5:30 PM
Location: Willowbank School of Restoration Arts - 14487 Niagara Pkwy, Queenston, ON L0S 1L0, Canada
Wiss, Janney, Elstner Associates, Inc.
The use of non-destructive evaluation (NDE) in the assessment of heritage structures is extremely effective in obtaining critical information regarding a building’s structural arrangement and condition. All this can be achieved, while minimizing disruption to the historic fabric. Some preservationists, architects and engineers however, who are unfamiliar with the technologies available may be less inclined to use them due to a lack of education on the subject, and, in some cases, due to a lack of confidence in the results. You no longer are limited to expensive solutions like major rebuilds of masonry walls or intrusive interventions like grout injection or epoxy anchors without knowing the actual internal wall conditions or projected outcomes ...now you can get the detailed information you want and just repair the actual problem area.
NDE of buildings and structures in a very broad sense is the act of understanding how energy behaves (be it light, heat, sound, current vibration, or other) when directed at or passed through a building material or component. Correctly interpreting data collected from techniques that use this energy, such as Ground Penetrating Radar (GPR), Infrared Thermal Imaging, Metal Detection and Ultrasonics is the key to a successful investigation that will ultimately help a project team fully understand their building and design the most appropriate repairs.
The purpose of this 2-day workshop is to explore the most effective NDE technique combinations, provide attendees a hands-on opportunity to experimentation with NDE equipment, and attempt to eliminate some of the confusion and mystery that frequently surrounds the world of NDE.
Day One of the workshop will be held at The Willowbank School in Queenston, Ontario – an impressive 1830s Greek Revival mansion perched above the Niagara River which is the focus of the Willowbank Centre. Day Two takes you to the Buffalo Central Terminal, one of the largest Art Deco train stations in the country, currently on the 2018 World Monument Watch List.
Bus Departs: 7:00am
Break: 10:30 - 10:45am
Lunch: 12:00 - 1:00pm
Demos: 2:30 - 5:30pm (15min break in between)
*Total CE hours for Workshop 3 is based on 2-days participation.
7:00 to 8:00 - Travel from Hyatt to Willowbank School of Restoration Arts and National Historic Site.
8:00 - 8:30 -Welcome and Introductions, Tim Crowe workshop Coordinator –followed by 10 to 15 minute introductory presentation to the site by Scott Tripp workshop Coordinator, conference vice chair and Willowbank Alumni.
8:30 - 10:30 - General NDE principles (Charles Bransby-Zachary) - leading into a broad based conversation about when NDE is appropriate and when low-tech, traditional solutions may be prudent or combined. NDE Principles will include discussion on numerous different types of NDE tools from the core techniques to discussions about developing technologies such as X-Ray and how their use will change the way we investigate. This section will also include an assortment of Case Studies to provide attendees with a full understanding as to proven NDE applications. (This workshop is targeted toward all general Heritage preservation professionals not Professional Engineers, so that they can gain a functional understanding of these tools. No prior knowledge NDE is required or assumed)
10:30 - 10:45 - Break
10:45 - 12:00 - NDE principles related to masonry - (Michael Schuller).
This will include discussion of topics including rebound hardness, Pulse velocity, impact echo, ultrasonic and Radar. The value of infrared thermography and insitu testing of masonry structure will be covered. The equipment demonstrations will include pulse echo, GPR and shear-wave tomography as well as others.
12:00 to 1:00 - Lunch
1:00 - 2:30 - NDE principles related to Wood - (Lyse Blanchet). In the context of conservation/preservation of historic and heritage structures, the use of NDE and NDT Techniques is necessary. Philosophical and scientific approaches to heritage conservation and sustainability will be introduced. The most effective/efficient NDT techniques to evaluate the condition of existing wooden structures will be presented. Wood science and technology will be briefly touched on. The strategic areas of a historic wooden structure to evaluate the condition, and the location and direction to measure wood characteristics and properties will be shown for different wooden construction types and connections. How to assess the structural integrity and performance of the current structure will be discussed. Case studies of National Historic Sites of Canada and of Federal Heritage Buildings will be presented where the challenges will be exposed and the approaches taken described.
2:30 - 5:30 PM - Break-out sessions - on site NDE demonstrations.
Four - 30-45 minute segments with break intermingled
Demonstrators: Charles Bransby-Zachary / Michael Schuller/ Lyse Blanchet.
5:30 PM - travel back to hotel
5:30 PM close Day 1
This course qualifies for HSW credit with AIA, ASLA and RCEP.
- Interpret data collected from ground penetrating radar to determine existing landscape, structural and building envelope issues requiring preservation during a rehabilitation.
- Illustrate how the use and interpretation of energy waves directed at a historic building material can be an important preservation tool.
- Choose the appropriate NDE techniques based on the type of historic material, which will assist in determining the appropriate restoration recommendations.
- Determine actual internal wall historic conditions and materials whose understanding will allow preservation of a building’s walls without intrusive interventions