Track 3: DELIVERY – INTERVENING INTO HISTORIC PLACES / Volet 3 : Réalisation – Intervenir dans les lieux historiques

No Lightweight Matter: developing a custom-made patch repair system for exposed lightweight aggregate precast concrete based on expanded clay materials

Saturday, October 14
1:30 PM - 3:00 PM

The project team developed a pioneering patch repair system to fulfill performance specification requirements and aesthetic considerations to match a 1980's Brutalist precast concrete cladding where surface appearance involved restoration of an exposed lightweight aggregate finish. The challenges were: (a) for the mortar to match both the colors and texture of the machine-dressed, expanded clay coarse aggregate; (b) to obtain a minimum 5,000 psi compressive strength; and (c) while accounting for the massive moisture absorption characteristics of the expanded clay that influences water-cement ratios, slump, shrinkage and strength.

The authors will describe the context for their work; explain the design parameters that were addressed in the pilot trials and laboratory experimentation; illustrate the sequence of activities that helped to determine the appropriate technical responses; and reveal the successful trial outputs and outcomes in terms of an ingenious two-part, ready mix, custom formulation to resolve what otherwise would have been an intractable problem.

Learning Objectives:

Michael Edison

President
Edison Coatings Inc.

Michael Edison, Chemical Engineer and President of Edison Coatings, has been working in product development, formulation and technical support for 44 years. He holds a degree in Chemical Engineering from Polytechnic University (NYU) and and MBA from the University of New Haven. He is Vice President of the Society for the Preservation of Historic Cements, Inc., and Task Group Chair of ASTM C1.10.01 on Natural Cement.

Presentation(s):

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John A. Fidler, RIBA, IHBC, Intl Assoc AIA, FRICS, FSA, FRSA, FIIC, FAPT

President & Chief Technical Officer
John Fidler Preservation Technology Inc.

APT Fellow John Fidler is a British-licensed architect with two postgraduate degrees in building conservation and over 37 years specialist experience in the preservation, restoration and rehabilitation of historic buildings, areas, monuments and archaeological sites. He runs an international technical consultancy business from Los Angeles in support of all those concerned with the sustainable welfare of the historic environment. Until 2006, he was the Conservation Director of English Heritage in London; Vice President of ICCROM; and a member of the Getty Foundation's conservation grants committee. He is currently editing the 4th edition of Sir Bernard Feilden's Conservation of Historic Buildings.

Presentation(s):

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Susan Ross

Assistant Professor/Undergraduate Supervisor
Carleton University

Presentation(s):

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No Lightweight Matter: developing a custom-made patch repair system for exposed lightweight aggregate precast concrete based on expanded clay materials



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