Flexural Behavior of Alkali-Activated Ultra-High-Performance Geopolymer Concrete Beams
Ultra-high-performance geopolymer concrete (UHPGC) emerges as a sustainable and cost-effective alternative to Portland cement-based UHPC, offering similar mechanical properties while significantly reducing carbon footprint and energy consumption. Research on UHPGC components is extremely scarce. Thi...
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| Format: | Article |
| Language: | English |
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MDPI AG
2024-03-01
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| Series: | Buildings |
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| Online Access: | https://www.mdpi.com/2075-5309/14/3/701 |
| _version_ | 1797241787871395840 |
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| author | Jie Su Jiandong Tan Kai Li Zhi Fang |
| author_facet | Jie Su Jiandong Tan Kai Li Zhi Fang |
| author_sort | Jie Su |
| collection | DOAJ |
| description | Ultra-high-performance geopolymer concrete (UHPGC) emerges as a sustainable and cost-effective alternative to Portland cement-based UHPC, offering similar mechanical properties while significantly reducing carbon footprint and energy consumption. Research on UHPGC components is extremely scarce. This study focuses on the flexural and crack behavior of UHPGC beams with different steel fiber contents and longitudinal reinforcement ratios. Five UHPGC beams were tested under four-point bending. The test results were evaluated in terms of the failure mode, load–deflection relationship, flexural capacity, ductility, average crack spacing, and short-term flexural stiffness. The results show that all the UHPGC beams failed due to crack localization. Increases in the reinforcement ratio and steel fiber content had favorable effects on the flexural capacity and flexural stiffness. When the reinforcement ratio increased from 1.18% to 2.32%, the flexural capacity and flexural stiffness increased by 60.5% and 12.3%, respectively. As the steel fiber content increased from 1.5% to 2.5%, the flexural capacity and flexural stiffness increased by 4.7% and 4.4%, respectively. Furthermore, the flexural capacity, flexural stiffness, and crack spacing of the UHPGC beams were evaluated using existing methods. The results indicate that the existing methods can effectively predict flexural capacity and flexural stiffness in UHPGC beams but overestimate crack spacing. This study will provide a reference for the structural design of UHPGC. |
| first_indexed | 2024-04-24T18:28:53Z |
| format | Article |
| id | doaj.art-385ccf01f51b4b9ead82a30fe229dd05 |
| institution | Directory Open Access Journal |
| issn | 2075-5309 |
| language | English |
| last_indexed | 2024-04-24T18:28:53Z |
| publishDate | 2024-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Buildings |
| spelling | doaj.art-385ccf01f51b4b9ead82a30fe229dd052024-03-27T13:29:17ZengMDPI AGBuildings2075-53092024-03-0114370110.3390/buildings14030701Flexural Behavior of Alkali-Activated Ultra-High-Performance Geopolymer Concrete BeamsJie Su0Jiandong Tan1Kai Li2Zhi Fang3Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province, College of Civil Engineering, Hunan University, Changsha 410082, ChinaCollege of Civil Engineering, Hunan University, Changsha 410082, ChinaKey Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province, College of Civil Engineering, Hunan University, Changsha 410082, ChinaKey Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province, College of Civil Engineering, Hunan University, Changsha 410082, ChinaUltra-high-performance geopolymer concrete (UHPGC) emerges as a sustainable and cost-effective alternative to Portland cement-based UHPC, offering similar mechanical properties while significantly reducing carbon footprint and energy consumption. Research on UHPGC components is extremely scarce. This study focuses on the flexural and crack behavior of UHPGC beams with different steel fiber contents and longitudinal reinforcement ratios. Five UHPGC beams were tested under four-point bending. The test results were evaluated in terms of the failure mode, load–deflection relationship, flexural capacity, ductility, average crack spacing, and short-term flexural stiffness. The results show that all the UHPGC beams failed due to crack localization. Increases in the reinforcement ratio and steel fiber content had favorable effects on the flexural capacity and flexural stiffness. When the reinforcement ratio increased from 1.18% to 2.32%, the flexural capacity and flexural stiffness increased by 60.5% and 12.3%, respectively. As the steel fiber content increased from 1.5% to 2.5%, the flexural capacity and flexural stiffness increased by 4.7% and 4.4%, respectively. Furthermore, the flexural capacity, flexural stiffness, and crack spacing of the UHPGC beams were evaluated using existing methods. The results indicate that the existing methods can effectively predict flexural capacity and flexural stiffness in UHPGC beams but overestimate crack spacing. This study will provide a reference for the structural design of UHPGC.https://www.mdpi.com/2075-5309/14/3/701alkali-activated cementultra-high-performance geopolymer concrete (UHPGC)beamflexural behaviorreinforcement ratiosteel fiber content |
| spellingShingle | Jie Su Jiandong Tan Kai Li Zhi Fang Flexural Behavior of Alkali-Activated Ultra-High-Performance Geopolymer Concrete Beams Buildings alkali-activated cement ultra-high-performance geopolymer concrete (UHPGC) beam flexural behavior reinforcement ratio steel fiber content |
| title | Flexural Behavior of Alkali-Activated Ultra-High-Performance Geopolymer Concrete Beams |
| title_full | Flexural Behavior of Alkali-Activated Ultra-High-Performance Geopolymer Concrete Beams |
| title_fullStr | Flexural Behavior of Alkali-Activated Ultra-High-Performance Geopolymer Concrete Beams |
| title_full_unstemmed | Flexural Behavior of Alkali-Activated Ultra-High-Performance Geopolymer Concrete Beams |
| title_short | Flexural Behavior of Alkali-Activated Ultra-High-Performance Geopolymer Concrete Beams |
| title_sort | flexural behavior of alkali activated ultra high performance geopolymer concrete beams |
| topic | alkali-activated cement ultra-high-performance geopolymer concrete (UHPGC) beam flexural behavior reinforcement ratio steel fiber content |
| url | https://www.mdpi.com/2075-5309/14/3/701 |
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