Alkali-dolomite reaction in air lime mortar : implications for increased strength and water resistance

Štukovnik, Petra (avtor), Bokan-Bosiljkov, Violeta (avtor), Marinšek, Marjan (avtor)

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 CaCO$_3$ dissolution/reprecipitation) were described in detail. Ageing temperature decisively influenced the kinetics of the dedolomitisation and dictated the path of the CaCO$_3$ 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.

• Jezik: Angleški jezik
• Ključne besede: lime mortar, alkali-carbonate reactions, mechanical properties, CaCO$_3$ dissolution/reprecipitation, civil engineering materials
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FGG - Fakulteta za gradbeništvo in geodezijo ; FKKT - Fakulteta za kemijo in kemijsko tehnologijo
• Status publikacije: Objavljeno
• Različica publikacije: Recenzirani rokopis
• Leto izida: 2020
• Št. strani: Str. 160-168
• Številčenje: Vol. 45
• PID: 20.500.12556/RUL-114958
• UDK: 691
• ISSN pri članku: 1296-2074
• DOI: 10.1016/j.culher.2020.02.007
• COBISS.SI-ID: 9109089
• Datum objave v RUL: 02.04.2020

Gradivo je del revije

• Naslov: Journal of cultural heritage
• Skrajšan naslov: J. cult. herit.
• Založnik: Elsevier, Consiglio Nazionale delle Ricerche
• ISSN: 1296-2074
• COBISS.SI-ID: 1228053

Licence

• Licenca: CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
• Opis: Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.
• Začetek licenciranja: 17.02.2020

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: gradbeni materiali, apnena malta, alkalno-karbonatne reakcije, mehanske lastnosti, CaCO$_3$ raztapljanje/obarjanje