期刊
JOURNAL OF CULTURAL HERITAGE
卷 12, 期 4, 页码 346-355出版社
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.culher.2011.02.005
关键词
Hydroxyapatite; Consolidation; Carbonate stones; Dynamic elastic modulus; Tensile strength
类别
资金
- Kress Foundation
- Getty Conservation Institute
- NSF MRSEC through the Princeton Center for Complex Materials [DMR-0819860]
The feasibility and the effectiveness of using hydroxyapatite (HAP) formed by reacting limestone with a solution of diammonium hydrogen phosphate (DAP) in mild conditions, as a consolidant for carbonate stones were investigated. Firstly, a novel method for predamaging limestone was developed. Then, the effects of DAP solution concentration and reaction duration were evaluated to define the best treatment conditions, and the strengthening effect was evaluated on artificially damaged Indiana Limestone samples. Treated samples exhibit a significant increase in the dynamic elastic modulus and tensile strength, which is attributed to microcrack reduction and pore filling consequent to formation of calcium phosphate phases at grain boundaries, as assessed by SEM/EDS and ESEM/EBSD. Consequent to a slight reduction of coarser pores, as revealed by MIP, the sorptivity of treated samples is only slightly reduced, so that water and water vapor exchanges with the environment are not significantly blocked. (C) 2011 Elsevier Masson SAS. All rights reserved.
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