Abstract
AbstractIn the conservation of ancient masonry structures, due to the scarcity of traditional slaked lime putty, an hydrated lime putty could possibly be used as an alternative binder. The hydrated lime putty can be obtained by soaking the dry hydrated lime powders in water for a certain time. In this article, two approaches to increase the specific surface area of the hydrated lime putty are evaluated. One approach reduces the particle/agglomerate size and the other one mainly aims to promote the formation of Ca(OH)2 hexagonal platelets. Several ways were found to be effective in reducing the particle/agglomerate size, including preselection of high-purity dry hydrated lime with finer particles, by conducation 1-h-long ultrasonication and the addition of 0.5% by weight polycarboxylate-based plasticizer. Meanwhile, a cold-and-hot cycling treatment were found to be effective in promoting the formation of hexagonal platelets of Ca(OH)2. Three cycles, each consisting of 12 h of stirring at room temperature a...
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