ACR in dolomitic aggregate concrete for an autogenous self-healing process

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

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.

• Jezik: Angleški jezik
• Ključne besede: alkali carbonate reaction (ACR), self-healing, dedolomitisation, formation of new phases, mechanical strength
• Vrsta gradiva: Znanstveno delo
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FGG - Fakulteta za gradbeništvo in geodezijo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2020
• Št. strani: Str. 379-384
• Številčenje: Letn. 54, št. 3
• PID: 20.500.12556/RUL-120769
• UDK: 67.017
• ISSN pri članku: 1580-2949
• DOI: 10.17222/mit.2019.196
• COBISS.SI-ID: 20433155
• Datum objave v RUL: 25.09.2020

Gradivo je del revije

• Naslov: Materiali in tehnologije
• Skrajšan naslov: Mater. tehnol.
• Založnik: Inštitut za kovinske materiale in tehnologije
• ISSN: 1580-2949
• COBISS.SI-ID: 106193664

Sekundarni jezik

• Jezik: Slovenski jezik
• Naslov: Vpliv ACR-reakcije na avtogeno celjenje betonov z dolomitnim agregatom
• Ključne besede: alkalno karbonatna reakcija (ACR), samoceljenje, dedolomitizacija, oblikovanje novih faz, mehanska trdnost

Projekti

• Financer: ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
• Številka projekta: J2-9196
• Naslov: Masivni betoni - optimiziranje tehnologije ob uporabi naprednih preskusnih metod