Hemp Fiber Reinforced Red Mud/Fly Ash Geopolymer Composite Materials: Effect of Fiber Content on Mechanical Strength
Novel hemp fiber reinforced geopolymer composites were fabricated. The matrix was a new geopolymer based on a mixture of red mud and fly ash. Chopped, randomly oriented hemp fibers were used as reinforcement. The mechanical properties of the geopolymer composite, such as diametral tensile (DTS) (or...
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MDPI AG
2021-01-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/14/3/511 |
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| author | Eyerusalem A. Taye Judith A. Roether Dirk W. Schubert Daniel T. Redda Aldo R. Boccaccini |
| author_facet | Eyerusalem A. Taye Judith A. Roether Dirk W. Schubert Daniel T. Redda Aldo R. Boccaccini |
| author_sort | Eyerusalem A. Taye |
| collection | DOAJ |
| description | Novel hemp fiber reinforced geopolymer composites were fabricated. The matrix was a new geopolymer based on a mixture of red mud and fly ash. Chopped, randomly oriented hemp fibers were used as reinforcement. The mechanical properties of the geopolymer composite, such as diametral tensile (DTS) (or Brazilian tensile) strength and compressive strength (CS), were measured. The geopolymer composites reinforced with 9 vol.% and 3 vol.% hemp fiber yielded average DTS values of 5.5 MPa and average CS values of 40 MPa. Scanning electron microscopy (SEM) studies were carried out to evaluate the microstructure and fracture surfaces of the composites. The results indicated that the addition of hemp fiber is a promising approach to improve the mechanical strength as well as to modify the failure mechanism of the geopolymer, which changed from brittle to “pseudo-ductile”. |
| first_indexed | 2024-03-09T04:04:39Z |
| format | Article |
| id | doaj.art-7fffecaf77ee408b9fa0ea46d9c8ac58 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T04:04:39Z |
| publishDate | 2021-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-7fffecaf77ee408b9fa0ea46d9c8ac582023-12-03T14:07:56ZengMDPI AGMaterials1996-19442021-01-0114351110.3390/ma14030511Hemp Fiber Reinforced Red Mud/Fly Ash Geopolymer Composite Materials: Effect of Fiber Content on Mechanical StrengthEyerusalem A. Taye0Judith A. Roether1Dirk W. Schubert2Daniel T. Redda3Aldo R. Boccaccini4Department of Materials Science and Engineering, Institute of Biomaterials, University of Erlangen-Nuremberg, Cauerstrasse 6, 91058 Erlangen, GermanyDepartment of Materials Science and Engineering, Institute of Polymer Materials, University of Erlangen-Nuremberg, Martensstr 7, 91058 Erlangen, GermanyDepartment of Materials Science and Engineering, Institute of Polymer Materials, University of Erlangen-Nuremberg, Martensstr 7, 91058 Erlangen, GermanyInstitute of Technology, School of Mechanical and Industrial Engineering, Addis Ababa University, Addis Ababa 7754, EthiopiaDepartment of Materials Science and Engineering, Institute of Biomaterials, University of Erlangen-Nuremberg, Cauerstrasse 6, 91058 Erlangen, GermanyNovel hemp fiber reinforced geopolymer composites were fabricated. The matrix was a new geopolymer based on a mixture of red mud and fly ash. Chopped, randomly oriented hemp fibers were used as reinforcement. The mechanical properties of the geopolymer composite, such as diametral tensile (DTS) (or Brazilian tensile) strength and compressive strength (CS), were measured. The geopolymer composites reinforced with 9 vol.% and 3 vol.% hemp fiber yielded average DTS values of 5.5 MPa and average CS values of 40 MPa. Scanning electron microscopy (SEM) studies were carried out to evaluate the microstructure and fracture surfaces of the composites. The results indicated that the addition of hemp fiber is a promising approach to improve the mechanical strength as well as to modify the failure mechanism of the geopolymer, which changed from brittle to “pseudo-ductile”.https://www.mdpi.com/1996-1944/14/3/511hemp fibergeopolymer compositemechanical propertiesred mudfly ashmicrostructural analysis |
| spellingShingle | Eyerusalem A. Taye Judith A. Roether Dirk W. Schubert Daniel T. Redda Aldo R. Boccaccini Hemp Fiber Reinforced Red Mud/Fly Ash Geopolymer Composite Materials: Effect of Fiber Content on Mechanical Strength Materials hemp fiber geopolymer composite mechanical properties red mud fly ash microstructural analysis |
| title | Hemp Fiber Reinforced Red Mud/Fly Ash Geopolymer Composite Materials: Effect of Fiber Content on Mechanical Strength |
| title_full | Hemp Fiber Reinforced Red Mud/Fly Ash Geopolymer Composite Materials: Effect of Fiber Content on Mechanical Strength |
| title_fullStr | Hemp Fiber Reinforced Red Mud/Fly Ash Geopolymer Composite Materials: Effect of Fiber Content on Mechanical Strength |
| title_full_unstemmed | Hemp Fiber Reinforced Red Mud/Fly Ash Geopolymer Composite Materials: Effect of Fiber Content on Mechanical Strength |
| title_short | Hemp Fiber Reinforced Red Mud/Fly Ash Geopolymer Composite Materials: Effect of Fiber Content on Mechanical Strength |
| title_sort | hemp fiber reinforced red mud fly ash geopolymer composite materials effect of fiber content on mechanical strength |
| topic | hemp fiber geopolymer composite mechanical properties red mud fly ash microstructural analysis |
| url | https://www.mdpi.com/1996-1944/14/3/511 |
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