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ACR in dolomitic aggregate concrete for an autogenous self-healing process
ID
Štukovnik, Petra
(
Author
),
ID
Bokan-Bosiljkov, Violeta
(
Author
),
ID
Marinšek, Marjan
(
Author
)
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Abstract
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.
Language:
English
Keywords:
alkali carbonate reaction (ACR)
,
self-healing
,
dedolomitisation
,
formation of new phases
,
mechanical strength
Work type:
Scientific work
Typology:
1.01 - Original Scientific Article
Organization:
FGG - Faculty of Civil and Geodetic Engineering
Publication status:
Published
Publication version:
Version of Record
Year:
2020
Number of pages:
Str. 379-384
Numbering:
Letn. 54, št. 3
PID:
20.500.12556/RUL-120769
UDC:
67.017
ISSN on article:
1580-2949
DOI:
10.17222/mit.2019.196
COBISS.SI-ID:
20433155
Publication date in RUL:
25.09.2020
Views:
1693
Downloads:
338
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Record is a part of a journal
Title:
Materiali in tehnologije
Shortened title:
Mater. tehnol.
Publisher:
Inštitut za kovinske materiale in tehnologije
ISSN:
1580-2949
COBISS.SI-ID:
106193664
Secondary language
Language:
Slovenian
Title:
Vpliv ACR-reakcije na avtogeno celjenje betonov z dolomitnim agregatom
Keywords:
alkalno karbonatna reakcija (ACR)
,
samoceljenje
,
dedolomitizacija
,
oblikovanje novih faz
,
mehanska trdnost
Projects
Funder:
ARRS - Slovenian Research Agency
Project number:
J2-9196
Name:
Masivni betoni - optimiziranje tehnologije ob uporabi naprednih preskusnih metod
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