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Observation of reactions between dolomite aggregate grains and lime-based binder in lime mortars [Elektronski vir]Štukovnik, Petra, 1984- ; Marinšek, Marjan, kemijski inženir ; Bokan-Bosiljkov, VioletaThis paper investigates the process of alkali-carbonate reaction (ACR) in lime-based mortars prepared with certain dolomite aggregate. As binder either pure calcite lime putty or combination of the ... putty and volcanic tuff was used. The progress of ACR was studied using a petrographic microscope and scanning electron microscopy with X-ray microanalysis (SEM/EDS), on samples exposed to different conditions: accelerated conditions (1M NaOH solution at 60 °C, distilled water at 60 °C, and 1M NaOH solution at 20 °C) and reference conditions (distilled water at 20 °C). Compressive tests on mortar bars were also carried out, parallel to the microscopic investigation. The results indicate that the presence of hydroxide ions in binder is enough for the initiation and progress of ACR in the lime-based mortars with dolomite aggregate, although sodium hydroxide solution and/or increased temperature of 60 °C accelerate the reaction. Compressive strength of the pure lime mortar with dolomite aggregate, exposed to water or the NaOH solution, increases withtime considerably, due to ACR, and can be attributed to alterations to themicrostructure of the mortar. However, for the lime-pozzolana binder ACR seems to proceed slower than for the pure lime binder, if increase of the mortarʼs compressive strength over time is taken as indicator of the reaction.Source: 3rd Historic Mortars Conference [Elektronski vir] : HMC 13 : Glasgow, 11-13 September 2013 (Str. 1-8)Type of material - conference contribution ; adult, seriousPublish date - 2013Language - englishCOBISS.SI-ID - 6374497
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Štukovnik, Petra, 1984- | 31255 |
Marinšek, Marjan, kemijski inženir | 14115 |
Bokan-Bosiljkov, Violeta | 10379 |
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