| Naslov: | Combined effects of metakaolin and hybrid fibers on self-compacting concrete |
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| Avtorji: | ID Bede Odorčić, Natalija (Avtor)
ID Kravanja, Gregor (Avtor) |
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| Datoteke: |  materials-15-05588-v2.pdf (6,46 MB)
MD5: 7740405E999BD54BBCA97A2A6EEFA666
 https://www.mdpi.com/1996-1944/15/16/5588
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| Jezik: | Angleški jezik |
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| Vrsta gradiva: | Članek v reviji |
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| Tipologija: | 1.01 - Izvirni znanstveni članek |
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| Organizacija: | FGPA - Fakulteta za gradbeništvo, prometno inženirstvo in arhitekturo
FKKT - Fakulteta za kemijo in kemijsko tehnologijo
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| Opis: | There is a need to develop new construction materials with improved mechanical performance and durability that are low-priced and have environmental benefits at the same time. This
paper focuses on the rheological, mechanical, morphological, and durability properties of synthetic
and steel fiber reinforced self-compacting concrete (SCC) containing 5–15% metakaolin (M) by mass
as a green replacement for Portland cement. Testing of the fresh mixes included a slump-flow test,
density, and porosity tests. Mechanical properties were determined through compression and flexural
strength. A rapid chloride penetrability test (RCPT) and the chloride migration coefficient were used
to assess the durability of the samples. A scanning electron microscope (SEM) with energy dispersion
spectrometry (EDS) was used to study the concrete microstructure and the interfacial transition zone
(ITZ). The results show that a combination of metakaolin and hybrid fibers has a negative effect on
the flowability of SCC. In contrast, the inclusion of M and hybrid fibers has a positive effect on the
compressive and flexural strength of SCC. The fracture of SCC samples without fibers was brittle
and sudden, unlike the fiber-reinforced SCC samples, which could still transfer a considerable load
with increasing crack mouth opening deflection. Overall, the chloride migration coefficients were
reduced by up to 71% compared to the control mix. The chloride reduction is consistent with the
resulting compact concrete microstructure, which exhibits a strong bond between fibers and the
concrete matrix. |
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| Ključne besede: | self-compacting concrete, synthetic and steel fibers, metakaolin, rheology, mechanical properties, chloride penetration, SEM-EDS |
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| Status publikacije: | Objavljeno |
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| Verzija publikacije: | Objavljena publikacija |
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| Poslano v recenzijo: | 11.07.2022 |
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| Datum sprejetja članka: | 12.08.2022 |
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| Datum objave: | 15.08.2022 |
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| Založnik: | MDPI |
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| Leto izida: | 2022 |
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| Št. strani: | 19 str. |
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| Številčenje: | Vol. 15, iss. 16 |
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| PID: | 20.500.12556/DKUM-92035  |
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| UDK: | 66.02 |
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| COBISS.SI-ID: | 118750979 |
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| DOI: | 10.3390/ma15165588 |
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| ISSN pri članku: | 1996-1944 |
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| Avtorske pravice: | © 2022 by the authors |
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| Datum objave v DKUM: | 12.03.2025 |
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| Število ogledov: | 0 |
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| Število prenosov: | 0 |
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| Metapodatki: |    |
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| Področja: | Ostalo
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