Mechanical and fracture properties of steel fiber-reinforced geopolymer concrete
In this study, the effects of steel fibers on the mechanical properties of the geopolymer concrete – compressive, splitting tensile, and flexural strength; compressive elastic modulus; and fracture properties – were evaluated. Milling steel fibers were incorporated into the geopolymer concrete, and...
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| Published in | Science and engineering of composite materials Vol. 28; no. 1; pp. 299 - 313 |
|---|---|
| Main Authors | , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Berlin
De Gruyter
01.01.2021
Walter de Gruyter GmbH |
| Subjects | |
| Online Access | Get full text |
| ISSN | 2191-0359 0792-1233 2191-0359 |
| DOI | 10.1515/secm-2021-0030 |
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| Abstract | In this study, the effects of steel fibers on the mechanical properties of the geopolymer concrete – compressive, splitting tensile, and flexural strength; compressive elastic modulus; and fracture properties – were evaluated. Milling steel fibers were incorporated into the geopolymer concrete, and the volume fraction of the steel fibers was varied from 0 to 2.5%. Fly ash and metakaolin were chosen as the geopolymer precursors. Fracture parameters – critical effective crack length, initial fracture toughness, and unstable fracture toughness – were measured by a three-point bending test. The results indicated that all the mechanical properties of the geopolymer concrete are remarkably improved by the steel fibers with the optimum dosage. When the steel fiber content was under 2%, the cubic and axial compressive strength and the compressive elastic modulus increased. The inclusion of 2% steel fibers enhanced the cubic and axial compressive strength and the compressive elastic modulus by 27.6, 23.7, and 47.7%, respectively. When the steel fiber content exceeded 2%, the cubic and axial compressive strength and the compressive elastic modulus decreased, having values still higher than those of the geopolymer concrete without steel fibers. The splitting tensile strength and flexural strength of the concrete were enhanced with increasing steel fiber content. When the steel fiber content was 2.5%, the increment of the splitting tensile strength was 39.8%, whereas that of the flexural strength was 134.6%. The addition of steel fibers effectively improved the fracture toughness of the geopolymer concrete. With 2.5% steel fibers, the initial fracture toughness had an increase of 27.8%, and the unstable fracture toughness increased by 12.74 times compared to that of the geopolymer concrete without the steel fibers. |
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| AbstractList | In this study, the effects of steel fibers on the mechanical properties of the geopolymer concrete – compressive, splitting tensile, and flexural strength; compressive elastic modulus; and fracture properties – were evaluated. Milling steel fibers were incorporated into the geopolymer concrete, and the volume fraction of the steel fibers was varied from 0 to 2.5%. Fly ash and metakaolin were chosen as the geopolymer precursors. Fracture parameters – critical effective crack length, initial fracture toughness, and unstable fracture toughness – were measured by a three-point bending test. The results indicated that all the mechanical properties of the geopolymer concrete are remarkably improved by the steel fibers with the optimum dosage. When the steel fiber content was under 2%, the cubic and axial compressive strength and the compressive elastic modulus increased. The inclusion of 2% steel fibers enhanced the cubic and axial compressive strength and the compressive elastic modulus by 27.6, 23.7, and 47.7%, respectively. When the steel fiber content exceeded 2%, the cubic and axial compressive strength and the compressive elastic modulus decreased, having values still higher than those of the geopolymer concrete without steel fibers. The splitting tensile strength and flexural strength of the concrete were enhanced with increasing steel fiber content. When the steel fiber content was 2.5%, the increment of the splitting tensile strength was 39.8%, whereas that of the flexural strength was 134.6%. The addition of steel fibers effectively improved the fracture toughness of the geopolymer concrete. With 2.5% steel fibers, the initial fracture toughness had an increase of 27.8%, and the unstable fracture toughness increased by 12.74 times compared to that of the geopolymer concrete without the steel fibers. |
| Author | Wan, Jinyi Ling, Yifeng Zhang, Peng Wang, Jia Li, Qingfu |
| Author_xml | – sequence: 1 givenname: Peng surname: Zhang fullname: Zhang, Peng organization: School of Water Conservancy Engineering, Zhengzhou University, No. 100, Science Avenue, Zhengzhou, Henan Province, Zhengzhou 450001, People’s Republic of China – sequence: 2 givenname: Jia surname: Wang fullname: Wang, Jia organization: School of Water Conservancy Engineering, Zhengzhou University, No. 100, Science Avenue, Zhengzhou, Henan Province, Zhengzhou 450001, People’s Republic of China – sequence: 3 givenname: Qingfu surname: Li fullname: Li, Qingfu email: lqflch@zzu.edu.cn organization: School of Water Conservancy Engineering, Zhengzhou University, No. 100, Science Avenue, Zhengzhou, Henan Province, Zhengzhou 450001, People’s Republic of China – sequence: 4 givenname: Jinyi surname: Wan fullname: Wan, Jinyi organization: Yellow River Engineering Consulting Co., Ltd., Zhengzhou 450003, People’s Republic of China – sequence: 5 givenname: Yifeng surname: Ling fullname: Ling, Yifeng organization: Department of Civil, Construction and Environmental Engineering, Iowa State University, Ames, IA 50011, United States |
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| SubjectTerms | Compressive strength Elastic properties Fiber reinforced concretes Flexural strength Fly ash fracture properties Fracture toughness geopolymer concrete Geopolymers Mechanical properties Metakaolin Modulus of elasticity Modulus of rupture in bending Reinforcing steels Splitting steel fiber Steel fibers Tensile strength |
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| Title | Mechanical and fracture properties of steel fiber-reinforced geopolymer concrete |
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