Practical application of lime-pozzolan mortars to damp masonry

Author(s): Dita Frankeová, Dana Janotová, Zuzana Slížková
Paper category: Proceedings
Book title: Proceedings of the 5th Historic Mortars Conference
Editor(s): José Ignacio Álvarez, José María Fernández, Íńigo Navarro, Adrián Durán, Rafael Sirera
ISBN: 978-2-35158-221-3
e-ISBN: 978-2-35158-222-0
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 973-985
Total Pages: 12
Language : English

Abstract: The purpose of this study was to evaluate the performance of experimental lime-metakaolin renders in real conditions. For in situ testing, a cemetery fencing wall was chosen which, as demonstrated by a previous survey, was loaded with a high degree of moisture and water- soluble salts. This paper is focused on the visual and chemical-mineralogical characterization of the renders two years after application. Samples were taken from both the upper and lower parts of the wall. The analyses showed low concentrations of water-soluble salts (0.01- 0.03 wt.%) in the samples collected in the lower parts, while in contrast, the upper parts contained high concentrations up to 2.5 wt.% of salts. TGA and XRD analyses revealed that the high water content in the stained areas did not allow the carbonation reaction to take place to its full extent, while the pozzolanic reaction between the lime and the metakaolin was supported in these conditions. Lime-metakaolin renders are highly prone to colour change (moisture retention) due to the presence of pores in the 0.01-0.1 μm size range.

Online publication : 2019
Publication type : full_text
Public price (Euros) : 0.00