Track 1: DOCUMENTATION AND DIAGNOSTICS – UNDERSTANDING HISTORIC PLACES / Volet 1 : Documentation et diagnostic – Comprendre les lieux historiques

Concrete and Material Durability Assessments: The use of ISO 9223 as an indicator of material durability and long term performance of historic structures

Friday, October 13
10:30 AM - 12:15 PM

Understanding the impact of engineering material degradation, rates of deterioration, and how this occurs over time are governed by the environment in which structures are built or the loads to which they are subjected. Forecasting remaining service life and planning for durability of an existing structure is critical, particularly when the subject structure is advancing in age, and is a key structure in a major urban center. Additionally, understanding the consequence of material interactions which occur as the materials begin to degrade can guide future repair choices. Rehabilitation guidelines and service life extension options can be better established once the team understands the rate at which a structure is degrading.

The presentation will discuss utilizing ISO 9223, establishing a corrosivity index, and how this approach can apply to material degradation. The talk will illustrate this approach not just in relation to atmospheric metals, but in relation to reinforced concrete, and steel framed structures. In addition to understanding environment, information about performance from the site testing programs are used in durability and service life models. These models allow the team to understand how long the structure or components will perform and when a structure may encounter critical failures. With advance enough information, the team can determine the use of proactive repairs, mitigate issues prior to failures, and make more informed material selection choices going forward.

Current changes in climate, environment, loads and stresses on structures is critical in the understanding material degradation. By understanding site and structure specific conditions, long term projections on a structures' behavior can be determined through service life modelling. Mathematical models based on accurate scientific data allow for teams to intervene prior to failure or serious material degradation. This can allow the design team to make better more informed repair decisions. This presentation will illustrate how the ISO 9223 standard has been used in relation to service life and material durability models.

Case studies will include examples of the investigative approach being applied to historic structures or components within tunnels, facades and bridges in existing structures.

Learning Objectives:

Gina L. Crevello, MSc, Certificate in Conservation, Professional Associate AIC

Echem Consultants LLC

Gina Crevello is an architectural materials conservator and a professional associate (PA) of the American Institute of Conservation. Professionally trained at Columbia University’s GSAPP, she holds both an MSc and Advanced Certificate in Conservation. She trained in electrochemistry in the UK, advising on the Cutty Sark Clipper Ship, the world's sole remaining tea clipper and Grade I listed structure. Gina is founding principal of Echem Consultants LLC, a material science consultancy. With over 20 years’ experience, Gina specializes in material diagnostics and durability engineering. This includes corrosion condition assessments, building diagnostics, material testing, forensic investigations and electrochemical design and repair solutions. Ms. Crevello has over twenty publications on these topics and continues to lecture and publish on her team's work. Gina has co-authored with the Getty Conservation Institute’s Conserving Modern Architecture Initiative for the repair of Historic Concrete. She has been a Board Member of the APT Rocky Mountain Chapter (2003-5), Board Member for APTi (2012-2016), Co-Chair of the T&E Committee (2012-2014), and an active member of the TC-MH. As Co-chair of the National Association of Corrosion Engineer’s Concrete Service Life Extension Conference, she has helped to elevate material durability issues within the US Concrete and Corrosion Industries.


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Stephen J. Kelley, FAIA, SE, FAPT, FUSICOMOS

Stephen J Kelley, Inc.

Stephen J. Kelley is a registered architect and structural engineer in private practice who has devoted these two skills to the preservation of our built cultural heritage. With 35 years of experience, his projects range from small to immense, simple to sophisticated and cover a wide range of building materials and systems. His award-winning projects are located throughout the United States but he has also worked on significant projects in Asia, Europe, Africa, South America and the Caribbean basin. He has published widely on various aspects of preservation and is an educator who has taught at the university level thus sharing his experience with the next generation of preservation professionals. He has served on the Board of Directors of both the US Committee of the International Council on Monuments and Sites (US/ICOMOS) and the Association for Preservation Technology (APT) and was elevated to Fellowship in both organizations. He is a UNESCO Tangible Heritage Expert and is Vice President of the International Scientific Committee on the Analysis and Restoration of Structures of Architectural Heritage (ISCARSAH).


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Concrete and Material Durability Assessments: The use of ISO 9223 as an indicator of material durability and long term performance of historic structures

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