A Study of Waterproof Reinforcement Layers for the Post-Cracking Behavior of Fiber Reinforced Concrete
In this study, in order to protect the concrete layer from slab sinking cracks in the factory floor layer, four types of reinforcing materials with a notable waterproof performance are fixed at the bottom. Furthermore, short fibers mixed with concrete in order to evaluate the load transfer mechanism...
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| Format: | Article |
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MDPI AG
2020-08-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/10/17/5762 |
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| author | Jung-Il Kim Min-Ho Gong Je-Young Song Sang-Keun Oh Byoungil Kim |
| author_facet | Jung-Il Kim Min-Ho Gong Je-Young Song Sang-Keun Oh Byoungil Kim |
| author_sort | Jung-Il Kim |
| collection | DOAJ |
| description | In this study, in order to protect the concrete layer from slab sinking cracks in the factory floor layer, four types of reinforcing materials with a notable waterproof performance are fixed at the bottom. Furthermore, short fibers mixed with concrete in order to evaluate the load transfer mechanism and residual stress retention ability are used. The change in flexural strength due to the waterproof reinforcement varied from about 10 to 48% depending on the type of reinforcing material, and the flexural strength of the specimen reinforced with Typar and Preprufe was demonstrated to be the best. Additionally, the increase in flexural strength due to the combination of the SF20 + Typar and MF2.8 + Preprufe specimens was remarkable. After the concrete matrix cracking, the toughness resulting from the fiber pull-out resistance and the increase in the reaction force of the waterproof reinforcement showed a marked improvement in all the test specimens. The test specimen reinforced with Typar demonstrated the best crack resistance regardless of the fiber type. The crack transfer mechanism in the concrete floor can be summarized in that the fiber pull-out resistance and the reaction force of the waterproof reinforcement immediately after cracking causes a reduction of the crack length (<i>l</i>) from the rapid load transfer, and as a result, the fiber bridging zone (<i>l<sub>f</sub></i>) is widely protected. Therefore, it is determined that the residual stress rises, maintains, and slows, as the resistance of the fiber bridging in the cracked section and the effect of the waterproofing reinforcement layer is combined. |
| first_indexed | 2024-03-10T17:07:41Z |
| format | Article |
| id | doaj.art-3571139f2204447182759cbfa8dc0f67 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T17:07:41Z |
| publishDate | 2020-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-3571139f2204447182759cbfa8dc0f672023-11-20T10:44:59ZengMDPI AGApplied Sciences2076-34172020-08-011017576210.3390/app10175762A Study of Waterproof Reinforcement Layers for the Post-Cracking Behavior of Fiber Reinforced ConcreteJung-Il Kim0Min-Ho Gong1Je-Young Song2Sang-Keun Oh3Byoungil Kim4GCP KOREA INC., 301 Cheongneung-daero Namdong-gu, Incheon 21633, KoreaHyundai Engineering CO., LTD., 232 Yulgok-ro75, Jongno-gu, Seoul 03058, KoreaBK Waterproofing Technology Research Center, 232 Gongneung-ro, Nowon-gu, Seoul 01811, KoreaSchool of Architecture, Seoul National University of Science & Technology, 232 Gongneung-ro, Nowon-gu, Seoul 01811, KoreaSchool of Architecture, Seoul National University of Science & Technology, 232 Gongneung-ro, Nowon-gu, Seoul 01811, KoreaIn this study, in order to protect the concrete layer from slab sinking cracks in the factory floor layer, four types of reinforcing materials with a notable waterproof performance are fixed at the bottom. Furthermore, short fibers mixed with concrete in order to evaluate the load transfer mechanism and residual stress retention ability are used. The change in flexural strength due to the waterproof reinforcement varied from about 10 to 48% depending on the type of reinforcing material, and the flexural strength of the specimen reinforced with Typar and Preprufe was demonstrated to be the best. Additionally, the increase in flexural strength due to the combination of the SF20 + Typar and MF2.8 + Preprufe specimens was remarkable. After the concrete matrix cracking, the toughness resulting from the fiber pull-out resistance and the increase in the reaction force of the waterproof reinforcement showed a marked improvement in all the test specimens. The test specimen reinforced with Typar demonstrated the best crack resistance regardless of the fiber type. The crack transfer mechanism in the concrete floor can be summarized in that the fiber pull-out resistance and the reaction force of the waterproof reinforcement immediately after cracking causes a reduction of the crack length (<i>l</i>) from the rapid load transfer, and as a result, the fiber bridging zone (<i>l<sub>f</sub></i>) is widely protected. Therefore, it is determined that the residual stress rises, maintains, and slows, as the resistance of the fiber bridging in the cracked section and the effect of the waterproofing reinforcement layer is combined.https://www.mdpi.com/2076-3417/10/17/5762factory floorfiber reinforce concretestructural fiberswaterproof reinforcementtoughnessresidual stress |
| spellingShingle | Jung-Il Kim Min-Ho Gong Je-Young Song Sang-Keun Oh Byoungil Kim A Study of Waterproof Reinforcement Layers for the Post-Cracking Behavior of Fiber Reinforced Concrete Applied Sciences factory floor fiber reinforce concrete structural fibers waterproof reinforcement toughness residual stress |
| title | A Study of Waterproof Reinforcement Layers for the Post-Cracking Behavior of Fiber Reinforced Concrete |
| title_full | A Study of Waterproof Reinforcement Layers for the Post-Cracking Behavior of Fiber Reinforced Concrete |
| title_fullStr | A Study of Waterproof Reinforcement Layers for the Post-Cracking Behavior of Fiber Reinforced Concrete |
| title_full_unstemmed | A Study of Waterproof Reinforcement Layers for the Post-Cracking Behavior of Fiber Reinforced Concrete |
| title_short | A Study of Waterproof Reinforcement Layers for the Post-Cracking Behavior of Fiber Reinforced Concrete |
| title_sort | study of waterproof reinforcement layers for the post cracking behavior of fiber reinforced concrete |
| topic | factory floor fiber reinforce concrete structural fibers waterproof reinforcement toughness residual stress |
| url | https://www.mdpi.com/2076-3417/10/17/5762 |
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