Detailed investigation of ACR in concrete with silica-free dolomite aggregate

Štukovnik, Petra (avtor), Bokan-Bosiljkov, Violeta (avtor), Marinšek, Marjan (avtor)

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.

• Jezik: Angleški jezik
• Ključne besede: alkali carbonate reaction - ACR in concrete, silica-free dolomite aggregate, microstructure investigation, reaction mechanism
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FGG - Fakulteta za gradbeništvo in geodezijo ; FKKT - Fakulteta za kemijo in kemijsko tehnologijo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2019
• Št. strani: Str. 325-336
• Številčenje: Vol. 216
• PID: 20.500.12556/RUL-125411
• UDK: 691
• ISSN pri članku: 0950-0618
• DOI: 10.1016/j.conbuildmat.2019.04.260
• COBISS.SI-ID: 8799841
• Datum objave v RUL: 15.03.2021

Gradivo je del revije

• Naslov: Construction & building materials
• Skrajšan naslov: Constr. build. mater.
• Založnik: Scientific & Technical Press
• ISSN: 0950-0618
• COBISS.SI-ID: 25270784

Licence

• Licenca: CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
• Opis: Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.
• Začetek licenciranja: 15.03.2021

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: alkalno karbonatna reakcija, ACR v betonu, dolomitni agregat brez kremena, mikrostrukturne preiskave, reakcijski mehanizem