Effect of steel fiber shape and content on printability, microstructure and mechanical properties of 3D printable high strength cementitious materials
This study investigates the effects of steel fiber shape (straight and hooked-end) and content (0, 0.5, 1.0, and 1.5 vol%) on rheological properties, printability, mechanical performance and microstructure of 3D printable steel fiber reinforced high strength concrete (3DP-SFHSC). The results indicat...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2024-07-01
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| Series: | Case Studies in Construction Materials |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509524002316 |
| _version_ | 1797238047116361728 |
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| author | Zijian Jia Mengting Zhou Yu Chen Wei Wang Lei Ma Yuning Chen Chao Liu Yamei Zhang |
| author_facet | Zijian Jia Mengting Zhou Yu Chen Wei Wang Lei Ma Yuning Chen Chao Liu Yamei Zhang |
| author_sort | Zijian Jia |
| collection | DOAJ |
| description | This study investigates the effects of steel fiber shape (straight and hooked-end) and content (0, 0.5, 1.0, and 1.5 vol%) on rheological properties, printability, mechanical performance and microstructure of 3D printable steel fiber reinforced high strength concrete (3DP-SFHSC). The results indicate that the increase of fiber content improves the mechanical behaviors of 3DP-SFHSC, but the extrudability suffers from reduction when the fiber content exceeded 1.0 vol% due to the significant increase in yield stress. The addition of 1.5 vol% hooked-end fibers enhances the compressive strength of 3DP-SFHSC by 8%, 25.7%, and 40.4% in the X, Y, and Z directions, respectively. Additionally, it also improves the tensile strength in the X direction by 37.67%. The printed specimens exhibit weaker mechanical properties compared to the cast specimens. On the one hand, the lower fiber-matrix compactness resulting from the absence of vibration during printing leads to increased porosity and weak bonding between the steel fibers and matrix. On the other hand, the inconsistent movement between fibers and mortar matrix during extrusion process may also cause the formation of gaps around fibers. Straight fibers show pronounced enhancements in buildability, compressive strength and tensile strength compared to hooked-end fibers at the same fiber volume fraction. Straight fibers align easily during the extrusion process, contributing to a matrix with lower porosity and smaller average pore size. |
| first_indexed | 2024-04-24T17:29:25Z |
| format | Article |
| id | doaj.art-725bc110defa4e5cb9093ac7957fd4e4 |
| institution | Directory Open Access Journal |
| issn | 2214-5095 |
| language | English |
| last_indexed | 2024-04-24T17:29:25Z |
| publishDate | 2024-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj.art-725bc110defa4e5cb9093ac7957fd4e42024-03-28T06:37:53ZengElsevierCase Studies in Construction Materials2214-50952024-07-0120e03080Effect of steel fiber shape and content on printability, microstructure and mechanical properties of 3D printable high strength cementitious materialsZijian Jia0Mengting Zhou1Yu Chen2Wei Wang3Lei Ma4Yuning Chen5Chao Liu6Yamei Zhang7Jiangsu Key Laboratory of Construction Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, ChinaJiangsu Key Laboratory of Construction Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, ChinaJiangsu Key Laboratory of Construction Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, ChinaJiangsu Key Laboratory of Construction Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, ChinaJiangsu Key Laboratory of Construction Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, ChinaJiangsu Key Laboratory of Construction Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, ChinaJiangsu Key Laboratory of Construction Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, ChinaJiangsu Key Laboratory of Construction Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, China; Nanjing Institute for Intelligent Additive Manufacturing, Nanjing 211800, China; Corresponding author at: Jiangsu Key Laboratory of Construction Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, China.This study investigates the effects of steel fiber shape (straight and hooked-end) and content (0, 0.5, 1.0, and 1.5 vol%) on rheological properties, printability, mechanical performance and microstructure of 3D printable steel fiber reinforced high strength concrete (3DP-SFHSC). The results indicate that the increase of fiber content improves the mechanical behaviors of 3DP-SFHSC, but the extrudability suffers from reduction when the fiber content exceeded 1.0 vol% due to the significant increase in yield stress. The addition of 1.5 vol% hooked-end fibers enhances the compressive strength of 3DP-SFHSC by 8%, 25.7%, and 40.4% in the X, Y, and Z directions, respectively. Additionally, it also improves the tensile strength in the X direction by 37.67%. The printed specimens exhibit weaker mechanical properties compared to the cast specimens. On the one hand, the lower fiber-matrix compactness resulting from the absence of vibration during printing leads to increased porosity and weak bonding between the steel fibers and matrix. On the other hand, the inconsistent movement between fibers and mortar matrix during extrusion process may also cause the formation of gaps around fibers. Straight fibers show pronounced enhancements in buildability, compressive strength and tensile strength compared to hooked-end fibers at the same fiber volume fraction. Straight fibers align easily during the extrusion process, contributing to a matrix with lower porosity and smaller average pore size.http://www.sciencedirect.com/science/article/pii/S22145095240023163D printable concreteSteel fiberFiber shapePrintabilityMicrostructure |
| spellingShingle | Zijian Jia Mengting Zhou Yu Chen Wei Wang Lei Ma Yuning Chen Chao Liu Yamei Zhang Effect of steel fiber shape and content on printability, microstructure and mechanical properties of 3D printable high strength cementitious materials Case Studies in Construction Materials 3D printable concrete Steel fiber Fiber shape Printability Microstructure |
| title | Effect of steel fiber shape and content on printability, microstructure and mechanical properties of 3D printable high strength cementitious materials |
| title_full | Effect of steel fiber shape and content on printability, microstructure and mechanical properties of 3D printable high strength cementitious materials |
| title_fullStr | Effect of steel fiber shape and content on printability, microstructure and mechanical properties of 3D printable high strength cementitious materials |
| title_full_unstemmed | Effect of steel fiber shape and content on printability, microstructure and mechanical properties of 3D printable high strength cementitious materials |
| title_short | Effect of steel fiber shape and content on printability, microstructure and mechanical properties of 3D printable high strength cementitious materials |
| title_sort | effect of steel fiber shape and content on printability microstructure and mechanical properties of 3d printable high strength cementitious materials |
| topic | 3D printable concrete Steel fiber Fiber shape Printability Microstructure |
| url | http://www.sciencedirect.com/science/article/pii/S2214509524002316 |
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