Sebastijan Robič (Avtor), Aljoša Šajna (Avtor), Lucija Hanžič (Avtor), Alisa Machner (Avtor), Marie Helene Bjørndal (Avtor), Klaartje De Weerdt (Avtor), Yushan Gu (Avtor), Benoit Bary (Avtor), Rosamaria Lample (Avtor)

Povzetek

The design process of concrete structures is carried out using standards and guidelines, while the durability predictions of concrete structures is supported only with exposure classes and experience-based requirements. To improve durability predictions of the carbonation resistance of concrete, a numerical model is being developed within the Horizon 2020 project EnDurCrete, coupling the rate of carbonation, and the drying rate. To verify the numerical model, an accelerated carbonation study was carried out. Experiments were conducted on mortars incorporating a novel CEM II/C (S-LL) cement, developed within the EnDurCrete project, and a commercially available reference cementCEM II/A-S. EnDurCrete mortars (EnM) and reference mortars (RefM) were prepared with water-cement ratios of 0.6 and 0.5 (denoted with label extensions -06 and -05). Visual assessments and thermogravimetric analysis (TGA) were used to measure the carbonation rates, which were found to be ~1.0 mm day-0.5 in EnM-06 and ~0.6 mm day-0.5 in RefM-06, while in EnM-05 and RefM-05 the values were ~0.7 and ~0.2 mm day-0.5 respectively. Additionally, TGA shows that the initial portlandite (CH) content is ~1.5 wt% in EnM-06 as opposed to ~3.0 wt% in RefM-06. The difference in the initial CH content in the two hydrated binders might explain the difference in their carbonation rate. During the moisture transport experiments a gravimetric method was used to determine mass changes as specimens underwent drying and resaturation with and without CO2 present. The drying led to a decrease in mass, but in the presence of CO2 this mass loss was compensated by the mass gain due to uptake of CO2 during carbonation. The resaturation experiments indicate an increase in the suction porosity in the carbonated samples compared to the non-carbonated samples.

Ključne besede

beton;vpijanje vode;karbonizacija;ocena trajnosti;verifikacija modela;odprti dostop;concrete;absorption of water;carbonation;durability assessment;model verification;open access;

Podatki

Jezik: Angleški jezik
Leto izida:
Tipologija: 1.08 - Objavljeni znanstveni prispevek na konferenci
Organizacija: ZAG - Zavod za gradbeništvo Slovenije
Založnik: Slovenian National Building and Civil Engineering Institute
UDK: 624
COBISS: 64712707 Povezava se bo odprla v novem oknu
Matična publikacija: Construction materials for a sustainable future
Št. ogledov: 18
Št. prenosov: 8
Ocena: 0 (0 glasov)
Metapodatki: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Ostali podatki

Sekundarni jezik: Slovenski jezik
Sekundarne ključne besede: beton;vpijanje vode;karbonizacija;ocena trajnosti;verifikacija modela;
Komentar vira: Nasl. z nasl. zaslona; Opis vira z dne 26. 5. 2021;
Strani: Str. 128-135
ID: 22609117