Bentonite as a natural additive for lime and lime–metakaolin mortars used for restoration of adobe buildings |
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| Affiliation: | 1. Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Science (IGEM RAS), Staromonetny per. 35, Moscow 119017, Russian Federation;2. Federal State Budgetary Institution “All-Russian Scientific-research Institute of Mineral Resources named after N.M.Fedorovsky, Staromonetny per. 31, Moscow 119017, Russian Federation;3. Technical University of Crete, School of Mineral Resources Engineering, 73100 Chania, Crete, Greece;4. Lomonosov Moscow State University, Geological Faculty, Leninskie Gory 1, Moscow 119991, Russian Federation;5. Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences (IPGG RAS), nab. Makarova 2, St. Petersburg 199034, Russian Federation;6. D. Mendeleyev University of Chemical Technology of Russia, Department of High Energy Chemistry and Radioecology, Miusskaya sq. 9, Moscow 125047, Russian Federation;7. National Research Nuclear University «MEPhI», Department of Closed Nuclear Fuel Cycle Technology, Kashirskoe highway 31, Moscow 115409, Russian Federation;8. Nuclear Safety Institute, Russian Academy of Science (IBRAE RAS), 2nd Tulsky lane, 2/52, Moscow 115191, Russian Federation;1. AITEMIN, C/ Margarita Salas 14, Parque Leganés Tecnológico, 28918 Leganés, Madrid, Spain;2. CIEMAT, Avd. Complutense 40, 28040 Madrid, Spain |
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| Abstract: | This work estimates the behaviour of mortars based on lime, seeking their application as renders of adobe walls. Mortars with binder:aggregate 1:3 volumetric ratio were prepared as is traditionally used in old buildings in central parts of Portugal.Due to specificity of the support, two clays, natural clay bentonite (5 wt.%) and artificial clay metakaolin (20 wt.%) were used as additives to lime mortar to prepare 3 types of blended mortars, besides the air lime reference mortar. Mortar prisms 4 × 4 × 16 cm were analysed to assess mechanical properties and salt resistance. Moreover, the mortars were placed in three ways on old adobes taken from demolished houses and their behaviour was verified by artificial accelerated ageing test. Lastly, mortars were applied on a wall made from traditional adobes, where panels were monitored and trials with adhesion strength and Karsten tubes have been conducted. The results obtained by comparison of the characteristics from all the experimental procedures reveal that mortar containing air lime and 5 wt.% of bentonite fulfils in the best way the requirements in its use as render of adobe buildings. |
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| Keywords: | Lime Bentonite Metakaolin Mortar Mechanical properties Artificial ageing Adobe Restoration |
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