16760 KB0 KB200020262019Bokan-Bosiljkov, VioletaMarinšek, MarjanŠtukovnik, Petraštevilka:3letnik:53str. 425-432ISSN:1580-2949COBISSID_HOST:8832609URN:URN:NBN:SI:doc-D996SEP1enInštitut za kovinske materiale in tehnologijeMateriali in tehnologijealkali carbonate reaction (ACR)alkalno karbonatna reakcija (ACR)dedolomitisationdedolomitizacijaformation of new Mg-Al, Mg-Si and Mg-Al-Si phasesoblikovanje Mg-Al, Mg-Si fazoblikovanje Mg-Al-Si fazMicrostructural changes in cement mortar due to an alkali carbonate reaction| Spremembe mikrostrukture cementne malte zaradi alkalno karbonatne reakcije|This paper investigates the process of an alkali-carbonate reaction (ACR) in cement mortar in the time frame of 1 year. The mortar bars (40 mm % 40 mm % 160 mm) were prepared using dolomite of the Triassic age from the south-eastern part of Slovenia as a source of crushed stone aggregate. As a binder, Portland cement CEM I 52.5 R was used. The hardened mortar bars were exposed to accelerated ageing conditions simulated by 1-M NaOH at 60 °C or deionized water at 60 °C, 28 d after casting. The aged mortar samples were investigated using optical microscopy, SEM and XRD. The obtained results revealed that chemical reactions characteristic for the ACR progressed in all the analysed samples. Additionally, new Mg-Al, Mg-Si and Mg-Al-Si gel-like phases were detected at the aggregate-cement paste interface. The influence of the ACR on the mechanical properties of the cement mortar was studied through the flexural and compressive strength and the elasticity modulus of mortar barsTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije