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Novel hydroxyapatite-based consolidant and the acceleration of hydrolysis of silicate-based consolidants

Published online by Cambridge University Press:  18 July 2014

Sonia Naidu ,
Chun Liu  and
George W. Scherer
Sonia Naidu
Affiliation:
Department of Chemical and Biological Engineering, Eng. Quad. E-226, Princeton University, Princeton, NJ 08544, USA
Chun Liu
Affiliation:
Department of Chemistry, University of California, Berkeley, CA 94720, USA
George W. Scherer
Affiliation:
Department of Civil and Environmental Engineering, Eng. Quad. E-319, Princeton University, Princeton, NJ 08544, USA
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Abstract

This paper discusses the effectiveness of hydroxyapatite (HAP) as an inorganic consolidant for physically weathered Indiana Limestone, and as a coupling agent between limestone and a silicate consolidant. A double application is investigated, in which samples are coated with HAP followed by a commercially available silicate-based consolidant (Conservare® OH-100). To artificially weather limestone, a thermal degradation technique was utilized. Diammonium hydrogen phosphate (DAP) salt was reacted with limestone, alone and with cationic precursors, to produce HAP films. The dynamic elastic modulus, water sorptivity and tensile strength of the treated stones were evaluated. HAP was found to be an effective consolidant for weathered Indiana Limestone, and its performance was enhanced by addition of millimolar quantities of calcium chloride. However, HAP was not useful as a coupling agent; a double treatment with DAP is more effective than sequential treatment with DAP and Conservare®.

Keywords

artcoatingstrength
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1656: Symposium PP – Materials Issues in Art and Archaeology X , 2014 , pp. 9 - 14
Copyright
Copyright © Materials Research Society 2014 

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References

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