| Title: | Combined effects of metakaolin and hybrid fibers on self-compacting concrete |
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| Authors: | ID Bede Odorčić, Natalija (Author)
ID Kravanja, Gregor (Author) |
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| Files: |  materials-15-05588-v2.pdf (6,46 MB)
MD5: 7740405E999BD54BBCA97A2A6EEFA666
 https://www.mdpi.com/1996-1944/15/16/5588
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| Language: | English |
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| Work type: | Article |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | FGPA - Faculty of Civil Engineering, Transportation Engineering and Architecture
FKKT - Faculty of Chemistry and Chemical Engineering
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| Abstract: | 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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| Keywords: | self-compacting concrete, synthetic and steel fibers, metakaolin, rheology, mechanical properties, chloride penetration, SEM-EDS |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Submitted for review: | 11.07.2022 |
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| Article acceptance date: | 12.08.2022 |
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| Publication date: | 15.08.2022 |
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| Publisher: | MDPI |
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| Year of publishing: | 2022 |
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| Number of pages: | 19 str. |
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| Numbering: | Vol. 15, iss. 16 |
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| PID: | 20.500.12556/DKUM-92035  |
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| UDC: | 66.02 |
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| ISSN on article: | 1996-1944 |
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| COBISS.SI-ID: | 118750979 |
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| DOI: | 10.3390/ma15165588 |
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| Copyright: | © 2022 by the authors |
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| Publication date in DKUM: | 12.03.2025 |
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| Views: | 0 |
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| Downloads: | 7 |
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| Metadata: |    |
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| Categories: | Misc.
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