20.500.12556/RUL-114958 Alkali-dolomite reaction in air lime mortar implications for increased strength and water resistance 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. lime mortar alkali-carbonate reactions mechanical properties CaCO$_3$ dissolution/reprecipitation civil engineering materials gradbeni materiali apnena malta alkalno-karbonatne reakcije mehanske lastnosti CaCO$_3$ raztapljanje/obarjanje true true true Angleški jezik Slovenski jezik Članek v reviji 2020-04-02 14:30:44 2020-04-02 14:40:11 2022-08-27 03:58:53 0000-00-00 00:00:00 2020 0 0 Str. 160-168 Vol. 45 Sep-Oct 2020 0000-00-00 PostprintKoncna Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 2021-10-31 691 1296-2074 10.1016/j.culher.2020.02.007 9109089 1228053 RAZ_Stukovnik_Petra_2020.pdf RAZ_Stukovnik_Petra_2020.pdf 1 EB92F0021C15C2A8B9A8F7D848A83FB3 bc181aa74673bed05e9239519c433d3bb3b51a0c6f7a782e456b59af4d0d63c0 e15be8d0-a1bb-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=142194 https://www.sciencedirect.com/science/article/pii/S1296207419305849 1 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=130420 Fakulteta za gradbeništvo in geodezijo Fakulteta za kemijo in kemijsko tehnologijo 0 0 0