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Saturday, May 31 • 1:30pm - 2:00pm
(Architecture Session) Lime-Metakaolin Grouts for Conservation

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Fluid, lime-based grouts for the conservation of historic masonry, mosaics and plasters have been mentioned infrequently in the literature, and with relatively few details of the experimentation that led to their formulation and use. For non-hydraulic limes, the fundamental dilemma is, of course, that limes cure by carbonation, and cavities to be grouted are places in walls where little or no air is available. Our work of the past several years has therefore focused on the use of pozzolanic admixtures, and in particular on dehydroxylated clay.

The paper describes the technical challenges associated with the development of a lime-metakaolin grout, initially created as part of an engineered “port” anchor system for structural stabilization of deformed walls. Among these challenges are the competing requirements of fluidity and shrinkage, the latter requiring the incorporation of ultra-fine aggregates. Also discussed in detail will be the laboratory evaluation of both plastic and hardened properties, a subject of particular interest in the light of the recent publication of a testing manual by the Getty.

The first engineering use of this low-strength grout was in the fall of 2012, on a massive church tower in the northeastern United States. Since then, a second formulation was created for smaller-scale use by conservators of architecture and sculpture. Study of both lime-metakaolin formulations is on-going, with the potential to create a range of conservation materials, including surface-applied crack fillers, adhesives and repair mortars.


Norman Weiss

Director of Scientific Research, Integrated Conservation Resources, Inc.

Saturday May 31, 2014 1:30pm - 2:00pm
Garden Room