The Influence of Accelerated Carbonation on Physical and Mechanical Properties of Hemp-Fibre-Reinforced Alkali-Activated Fly Ash and Fly Ash/Slag Mortars
The physical and mechanical properties of hemp-fibre-reinforced alkali-activated (AA) mortars under accelerated carbonation were evaluated. Two matrices of different physical and chemical properties, i.e., a low Ca-containing and less dense one with fly ash (FA) and a high Ca-containing and denser o...
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| Format: | Article |
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MDPI AG
2022-04-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/14/9/1799 |
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| author | Ildiko Merta Bojan Poletanovic Jelena Dragas Vedran Carevic Ivan Ignjatovic Miroslav Komljenovic |
| author_facet | Ildiko Merta Bojan Poletanovic Jelena Dragas Vedran Carevic Ivan Ignjatovic Miroslav Komljenovic |
| author_sort | Ildiko Merta |
| collection | DOAJ |
| description | The physical and mechanical properties of hemp-fibre-reinforced alkali-activated (AA) mortars under accelerated carbonation were evaluated. Two matrices of different physical and chemical properties, i.e., a low Ca-containing and less dense one with fly ash (FA) and a high Ca-containing and denser one with FA and granulated blast furnace slag (GBFS), were reinforced with fibres (10 mm, 0.5 vol% and 1.0 vol%). Under accelerated carbonation, due to the pore refinement resulting from alkali and alkaline earth salt precipitation, AA hemp fibre mortars markedly (20%) decreased their water absorption. FA-based hemp mortars increased significantly their compressive and flexural strength (40% and 34%, respectively), whereas in the denser FA/GBFS matrix (due to the hindered CO<sub>2</sub> penetration, i.e., lower chemical reaction between CO<sub>2</sub> and pore solution and gel products), only a slight variation (±10%) occurred. Under accelerated carbonation, embrittlement of the fibre/matrix interface and of the whole composite occurred, accompanied by increased stiffness, decreased deformation capacity and loss of the energy absorption capacity under flexure. FA-based matrices exhibited more pronounced embrittlement than the denser FA/GBFS matrices. A combination of FA/GBFS-based mortar reinforced with 0.5 vol% fibre dosage ensured an optimal fibre/matrix interface and stress transfer, mitigating the embrittlement of the material under accelerated carbonation. |
| first_indexed | 2024-03-10T03:46:52Z |
| format | Article |
| id | doaj.art-6500466418f1460588e887103e05c4fe |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-10T03:46:52Z |
| publishDate | 2022-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-6500466418f1460588e887103e05c4fe2023-11-23T09:06:24ZengMDPI AGPolymers2073-43602022-04-01149179910.3390/polym14091799The Influence of Accelerated Carbonation on Physical and Mechanical Properties of Hemp-Fibre-Reinforced Alkali-Activated Fly Ash and Fly Ash/Slag MortarsIldiko Merta0Bojan Poletanovic1Jelena Dragas2Vedran Carevic3Ivan Ignjatovic4Miroslav Komljenovic5Institute of Material Technology, Building Physics, and Building Ecology, Faculty of Civil Engineering, TU Wien, 1040 Vienna, AustriaInstitute of Material Technology, Building Physics, and Building Ecology, Faculty of Civil Engineering, TU Wien, 1040 Vienna, AustriaFaculty of Civil Engineering, University of Belgrade, 11000 Belgrade, SerbiaFaculty of Civil Engineering, University of Belgrade, 11000 Belgrade, SerbiaFaculty of Civil Engineering, University of Belgrade, 11000 Belgrade, SerbiaInstitute for Multidisciplinary Research, University of Belgrade, 11030 Belgrade, SerbiaThe physical and mechanical properties of hemp-fibre-reinforced alkali-activated (AA) mortars under accelerated carbonation were evaluated. Two matrices of different physical and chemical properties, i.e., a low Ca-containing and less dense one with fly ash (FA) and a high Ca-containing and denser one with FA and granulated blast furnace slag (GBFS), were reinforced with fibres (10 mm, 0.5 vol% and 1.0 vol%). Under accelerated carbonation, due to the pore refinement resulting from alkali and alkaline earth salt precipitation, AA hemp fibre mortars markedly (20%) decreased their water absorption. FA-based hemp mortars increased significantly their compressive and flexural strength (40% and 34%, respectively), whereas in the denser FA/GBFS matrix (due to the hindered CO<sub>2</sub> penetration, i.e., lower chemical reaction between CO<sub>2</sub> and pore solution and gel products), only a slight variation (±10%) occurred. Under accelerated carbonation, embrittlement of the fibre/matrix interface and of the whole composite occurred, accompanied by increased stiffness, decreased deformation capacity and loss of the energy absorption capacity under flexure. FA-based matrices exhibited more pronounced embrittlement than the denser FA/GBFS matrices. A combination of FA/GBFS-based mortar reinforced with 0.5 vol% fibre dosage ensured an optimal fibre/matrix interface and stress transfer, mitigating the embrittlement of the material under accelerated carbonation.https://www.mdpi.com/2073-4360/14/9/1799accelerated carbonationalkali-activated mortarhemp fibresnatural fibresfly ashgranulated blast furnace slag |
| spellingShingle | Ildiko Merta Bojan Poletanovic Jelena Dragas Vedran Carevic Ivan Ignjatovic Miroslav Komljenovic The Influence of Accelerated Carbonation on Physical and Mechanical Properties of Hemp-Fibre-Reinforced Alkali-Activated Fly Ash and Fly Ash/Slag Mortars Polymers accelerated carbonation alkali-activated mortar hemp fibres natural fibres fly ash granulated blast furnace slag |
| title | The Influence of Accelerated Carbonation on Physical and Mechanical Properties of Hemp-Fibre-Reinforced Alkali-Activated Fly Ash and Fly Ash/Slag Mortars |
| title_full | The Influence of Accelerated Carbonation on Physical and Mechanical Properties of Hemp-Fibre-Reinforced Alkali-Activated Fly Ash and Fly Ash/Slag Mortars |
| title_fullStr | The Influence of Accelerated Carbonation on Physical and Mechanical Properties of Hemp-Fibre-Reinforced Alkali-Activated Fly Ash and Fly Ash/Slag Mortars |
| title_full_unstemmed | The Influence of Accelerated Carbonation on Physical and Mechanical Properties of Hemp-Fibre-Reinforced Alkali-Activated Fly Ash and Fly Ash/Slag Mortars |
| title_short | The Influence of Accelerated Carbonation on Physical and Mechanical Properties of Hemp-Fibre-Reinforced Alkali-Activated Fly Ash and Fly Ash/Slag Mortars |
| title_sort | influence of accelerated carbonation on physical and mechanical properties of hemp fibre reinforced alkali activated fly ash and fly ash slag mortars |
| topic | accelerated carbonation alkali-activated mortar hemp fibres natural fibres fly ash granulated blast furnace slag |
| url | https://www.mdpi.com/2073-4360/14/9/1799 |
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