20.500.12556/RUL-120769 ACR 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 process. alkali carbonate reaction (ACR) self-healing dedolomitisation formation of new phases mechanical strength alkalno karbonatna reakcija (ACR) samoceljenje dedolomitizacija oblikovanje novih faz mehanska trdnost true true true Angleški jezik Slovenski jezik Znanstveno delo 2020-09-25 10:26:27 2020-09-25 10:26:31 2022-09-01 04:00:28 0000-00-00 00:00:00 2020 0 0 Str. 379-384 št. 3 Letn. 54 2020 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 67.017 1580-2949 10.17222/mit.2019.196 20433155 106193664 RAZ_Stukovnik_Petra_2020.pdf RAZ_Stukovnik_Petra_2020.pdf 1 FFAD4475FCB69E8280B7D1B2D65A203A 2c89d1a0dab30d94c88e280cde337aa14b1101e6b55fd9cf063956beafe17432 2b68dc4f-a1ba-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=135591 Fakulteta za gradbeništvo in geodezijo 0 0 0