implications for increased strength and water resistance
Petra Štukovnik (Author), Violeta Bokan-Bosiljkov (Author), Marjan Marinšek (Author)

Abstract

This paper investigates the origin of increased strength and water resistance of air lime mortar prepared by Triassic dolomite aggregate when exposed to humid or wet environments. The mortar specimens were exposed to various ageing conditions and analysed using petrographic and scanning electron microscopy equipped with X-ray microanalysis. Parallel to these analyses, X-ray powder diffraction and strength tests were performed on the specimens. It was revealed that reactions associated with the dedolomitisation process of the dolomite grains in the lime binder (hereafter alkali-carbonate reactions or ACRs) are the source of the improved strength and water resistance. An increasingly alkaline environment accelerated the ACRs substantially. Two parallel processes during the ACRs (dedolomitisation and CaCO3 dissolution/reprecipitation) were described in detail. Ageing temperature decisively influenced the kinetics of the dedolomitisation and dictated the path of the CaCO3 dissolution/reprecipitation process. After two years of ageing in a water-saturated environment at 60°C, air lime mortar retained a great deal of its initial mechanical strength, and at 20°C its strength was considerably increased. This somewhat unexpected observation was explained as being a result of microstructural changes and/or phase transitions.

Keywords

gradbeni materiali;apnena malta;alkalno-karbonatne reakcije;mehanske lastnosti;CaCO3 raztapljanje/obarjanje;lime mortar;alkali-carbonate reactions;mechanical properties;CaCO3 dissolution/reprecipitation;civil engineering materials;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FGG - Faculty of Civil and Geodetic Engineering
Publisher: Elsevier
UDC: 691
COBISS: 9109089 Link will open in a new window
ISSN: 1296-2074
Views: 832
Downloads: 164
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Other data

Secondary language: Slovenian
Secondary keywords: gradbeni materiali;apnena malta;alkalno-karbonatne reakcije;mehanske lastnosti;CaCO$_3$ raztapljanje/obarjanje;
Type (COBISS): Article
Embargo end date (OpenAIRE): 2021-10-31
Pages: str. 1-9
Issue: ǂLetn. ǂXX
Chronology: 2020
DOI: 10.1016/j.culher.2020.02.007
ID: 11807778