Fiber distribution and its influencing mechanism on properties in sprayed ultra-high performance concrete
A fiber-reinforced sprayed ultra-high performance concrete (SUHPC) with high consistency and suitable sprayed thickness was developed in this paper. Fiber distribution of SUHPC after pumping and spraying is the intrinsic mechanism for the changes in strength and toughness, especially with its high c...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-07-01
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| Series: | Case Studies in Construction Materials |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509525001597 |
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| author | Jinyang Cui Shuguang Li Wenwei Li Zhen He Huamei Yang Kailai Zhang |
| author_facet | Jinyang Cui Shuguang Li Wenwei Li Zhen He Huamei Yang Kailai Zhang |
| author_sort | Jinyang Cui |
| collection | DOAJ |
| description | A fiber-reinforced sprayed ultra-high performance concrete (SUHPC) with high consistency and suitable sprayed thickness was developed in this paper. Fiber distribution of SUHPC after pumping and spraying is the intrinsic mechanism for the changes in strength and toughness, especially with its high consistency, high fiber content, and no coarse aggregate is completely different from conventional shotcrete. Thereby a series of studies were performed including rheological behaviours, mechanical properties, and their influencing mechanisms. Results showed that the field sprayed thickness of SUHPC achieved about 30 mm when it had a flow resistance of 164.7 % of casted UHPC, and its deformation recovery was very weak due to its strong thixotropy. More bubbles were entrapped during spraying, the partially unbroken bubbles were easily trapped in the fresh matrix and transformed into irregular coarse pores (≥25 μm) and a 55.2 % increase in porosity, which will partially weaken the strength and toughness of SUHPC. Additionally, the fiber orientation in SUHPC was more parallel to the sprayed surface after spraying, mainly concentrated in 75 ° to 85 °, and the fiber lap rate was also improved by 28.2 % because of its approximate two-dimensional distribution. As the fiber content decreased, the consistency of fresh concrete, porosity, and strength all showed a reduction, and the fibers became more parallel to the sprayed surface. Overall, the short straight steel fiber is preferred by SUHPC and its content should not be less than 78 kg/m3. |
| format | Article |
| id | doaj-art-76e2a007c9b54ed2808a68321d42c29e |
| institution | OA Journals |
| issn | 2214-5095 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj-art-76e2a007c9b54ed2808a68321d42c29e2025-08-20T02:13:27ZengElsevierCase Studies in Construction Materials2214-50952025-07-0122e0436110.1016/j.cscm.2025.e04361Fiber distribution and its influencing mechanism on properties in sprayed ultra-high performance concreteJinyang Cui0Shuguang Li1Wenwei Li2Zhen He3Huamei Yang4Kailai Zhang5China Three Gorges Corporation, Wuhan 430010, PR China; State Key Laboratory of Water Resources Engineering and Management, Wuhan University, Wuhan 430072, PR ChinaChina Three Gorges Corporation, Wuhan 430010, PR ChinaChina Three Gorges Corporation, Wuhan 430010, PR China; Corresponding authors.State Key Laboratory of Water Resources Engineering and Management, Wuhan University, Wuhan 430072, PR China; Corresponding authors.China Three Gorges Corporation, Wuhan 430010, PR ChinaChina Three Gorges Corporation, Wuhan 430010, PR ChinaA fiber-reinforced sprayed ultra-high performance concrete (SUHPC) with high consistency and suitable sprayed thickness was developed in this paper. Fiber distribution of SUHPC after pumping and spraying is the intrinsic mechanism for the changes in strength and toughness, especially with its high consistency, high fiber content, and no coarse aggregate is completely different from conventional shotcrete. Thereby a series of studies were performed including rheological behaviours, mechanical properties, and their influencing mechanisms. Results showed that the field sprayed thickness of SUHPC achieved about 30 mm when it had a flow resistance of 164.7 % of casted UHPC, and its deformation recovery was very weak due to its strong thixotropy. More bubbles were entrapped during spraying, the partially unbroken bubbles were easily trapped in the fresh matrix and transformed into irregular coarse pores (≥25 μm) and a 55.2 % increase in porosity, which will partially weaken the strength and toughness of SUHPC. Additionally, the fiber orientation in SUHPC was more parallel to the sprayed surface after spraying, mainly concentrated in 75 ° to 85 °, and the fiber lap rate was also improved by 28.2 % because of its approximate two-dimensional distribution. As the fiber content decreased, the consistency of fresh concrete, porosity, and strength all showed a reduction, and the fibers became more parallel to the sprayed surface. Overall, the short straight steel fiber is preferred by SUHPC and its content should not be less than 78 kg/m3.http://www.sciencedirect.com/science/article/pii/S2214509525001597SprayedUHPCRheologyFiber distributionToughness |
| spellingShingle | Jinyang Cui Shuguang Li Wenwei Li Zhen He Huamei Yang Kailai Zhang Fiber distribution and its influencing mechanism on properties in sprayed ultra-high performance concrete Case Studies in Construction Materials Sprayed UHPC Rheology Fiber distribution Toughness |
| title | Fiber distribution and its influencing mechanism on properties in sprayed ultra-high performance concrete |
| title_full | Fiber distribution and its influencing mechanism on properties in sprayed ultra-high performance concrete |
| title_fullStr | Fiber distribution and its influencing mechanism on properties in sprayed ultra-high performance concrete |
| title_full_unstemmed | Fiber distribution and its influencing mechanism on properties in sprayed ultra-high performance concrete |
| title_short | Fiber distribution and its influencing mechanism on properties in sprayed ultra-high performance concrete |
| title_sort | fiber distribution and its influencing mechanism on properties in sprayed ultra high performance concrete |
| topic | Sprayed UHPC Rheology Fiber distribution Toughness |
| url | http://www.sciencedirect.com/science/article/pii/S2214509525001597 |
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