3720 KB0 KB200020242020Bokan-Bosiljkov, VioletaMarinšek, MarjanŠtukovnik, Petraštevilka:3letnik:54str. 379-384ISSN:1580-2949COBISSID_HOST:20433155URN:URN:NBN:SI:doc-H8C4ICX1enInštitut za kovinske materiale in tehnologijeMateriali in tehnologijealkali carbonate reaction (ACR)alkalno karbonatna reakcija (ACR)dedolomitisationdedolomitizacijaformation of new phasesmechanical strengthmehanska trdnostoblikovanje novih fazsamoceljenjeself-healingACR in dolomitic aggregate concrete for an autogenous self-healing process| Vpliv ACR-reakcije na avtogeno celjenje betonov z dolomitnim agregatom|This paper investigates the process of alkali-carbonate reaction (ACR) in dolomite aggregate concrete in view of its potential as a self-healing process. Samples for the ACR self-healing study were prepared using a cement composite with self-compacting properties in fresh state. The mixture was composed of Portland cement CEM I and typical Slovenian crushed dolomite aggregate in the role of aggregate and stone filler. Samples were subsequently exposed to accelerated testing conditions simulated by 1-M NaOH at 60 °C or deionized water at 60 °C. The conducted research revealed that the complete ACR process was successfully triggered, including the dedolomitization and formation of secondary phases, i.e., CaCO3 called "carbonate halo", Ca-Al-involving phase and some minor phases containing Mg-Al, Mg-Si and/or Mg-Al-Si. Additionally, the "carbonate halo" and Ca-Al-involving phase also precipitated inside purposely preformed cracks in the samples. Smaller cracks up to 200 %m in width were completely filled with the "carbonate halo" and Ca-Al-involving phase. Wider cracks may not have been completely filled with the newly precipitated phases; however, their length and width were also successfully reduced. With filling of the pores and cracks, the mechanical strength of the cement composite was increased substantially due to the ACR self-healing processTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije