20.500.12556/RUL-125411 Detailed investigation of ACR in concrete with silica-free dolomite aggregate The progress of the alkali-carbonate reaction (ACR) in NaOH or an aqueous environment at elevated tem-perature (60°C) was investigated in concrete prepared with silica-free dolomite aggregate. The resultsobtained show that chemical reactions characteristic for the ACR progressed in all aged concrete systems.In NaOH aged samples, dolomite grains smaller than 2 mm in diameter went through a completededolomitisation process. Additionally, new Mg-Al, Mg-Si and Mg-Al-Si phases were recognized at theaggregate-cement paste interface. The less alkaline environment in the case of H2O-aged samplesresulted in substantially decelerated ACR reaction. Based on observed long-term microstructural andphase changes, a detailed scheme of the ACR in concretes with silica-free dolomite aggregates was pro-posed. It turned out that the soluble Si-source does not necessarily originate from the aggregate itself butrather through the Pozzolanic reaction of cement binder decomposition/regeneration cycle. alkali carbonate reaction - ACR in concrete silica-free dolomite aggregate microstructure investigation reaction mechanism alkalno karbonatna reakcija ACR v betonu dolomitni agregat brez kremena mikrostrukturne preiskave reakcijski mehanizem true false true Angleški jezik Slovenski jezik Članek v reviji 2021-03-15 09:12:21 2021-03-15 09:12:25 2022-09-05 03:50:34 0000-00-00 00:00:00 2019 0 0 Str. 325-336 Vol. 216 Avg. 2019 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 691 0950-0618 10.1016/j.conbuildmat.2019.04.260 8799841 25270784 RAZ_Stukovnik_Petra_2019.pdf RAZ_Stukovnik_Petra_2019.pdf 1 2EBBD25A39C5B49CCEE83407FE9EFE71 9a4643ed2447c98ee54d1bf0cea9642a90086b1d947a98b0b3d5214d4760cd84 b457e5dd-a1bb-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=141123 https://www.sciencedirect.com/science/article/pii/S0950061819311493 1 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=141224 Fakulteta za gradbeništvo in geodezijo Fakulteta za kemijo in kemijsko tehnologijo 0 0 0