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Flexural behavior and strength model of UHPC plate with steel macrofibers and wollastonite microfibers
This study conducted four-point bending tests on plates to investigate the effect of natural wollastonite microfiber (WF) on the flexural behaviors of three types of ultra-high performance concrete (UHPC): mono WFs reinforced UHPC (WF-UHPC), mono steel macrofibers (SFs) reinforced UHPC (SF-UHPC), and hybrid SFs and WFs reinforced UHPC (WFMUHPC). Meanwhile, the compressive and splitting tensile strengths of the specimens were also tested. The results showed that WF could significantly improve the compressive strength, splitting tensile strength, first crack flexural strength (fcr), peak flexural strength (fpeak), peak toughness (Ωp) and flexural toughness (Ωm) of UHPC matrix and SF-UHPC. When SF content was greater than 1.5 vol%, fpeak of SF-UHPC and WFMUHPC no longer showed a significant increase, and even presented a decrease in Ωp and Ωm, which was related to the group effect of SFs and wall effect. Digital camera (DC) test results showed that WF could deflect cracks. WFMUHPC with 1.5 vol% of SFs and no more than 9 vol% of WFs exhibited excellent multi-crack characteristics. Scanning electron microscope (SEM) test demonstrated that WF could bear the internal stress, be pulled out or fracture, and have filling effect on matrix. Based on composite theory, the calculation models of fcr and fpeak of UHPC plates were established.
Flexural behavior and strength model of UHPC plate with steel macrofibers and wollastonite microfibers
This study conducted four-point bending tests on plates to investigate the effect of natural wollastonite microfiber (WF) on the flexural behaviors of three types of ultra-high performance concrete (UHPC): mono WFs reinforced UHPC (WF-UHPC), mono steel macrofibers (SFs) reinforced UHPC (SF-UHPC), and hybrid SFs and WFs reinforced UHPC (WFMUHPC). Meanwhile, the compressive and splitting tensile strengths of the specimens were also tested. The results showed that WF could significantly improve the compressive strength, splitting tensile strength, first crack flexural strength (fcr), peak flexural strength (fpeak), peak toughness (Ωp) and flexural toughness (Ωm) of UHPC matrix and SF-UHPC. When SF content was greater than 1.5 vol%, fpeak of SF-UHPC and WFMUHPC no longer showed a significant increase, and even presented a decrease in Ωp and Ωm, which was related to the group effect of SFs and wall effect. Digital camera (DC) test results showed that WF could deflect cracks. WFMUHPC with 1.5 vol% of SFs and no more than 9 vol% of WFs exhibited excellent multi-crack characteristics. Scanning electron microscope (SEM) test demonstrated that WF could bear the internal stress, be pulled out or fracture, and have filling effect on matrix. Based on composite theory, the calculation models of fcr and fpeak of UHPC plates were established.
Flexural behavior and strength model of UHPC plate with steel macrofibers and wollastonite microfibers
Mater Struct
Zeng, Deming (author) / Cao, Mingli (author) / Li, Yuxiang (author) / Sun, Tingchao (author)
2024-05-01
Article (Journal)
Electronic Resource
English
Ultra-high performance concrete , Wollastonite microfiber , Flexural behavior , Cracking characteristics , Reinforcing mechanisms , Calculation model Engineering , Solid Mechanics , Materials Science, general , Theoretical and Applied Mechanics , Manufacturing, Machines, Tools, Processes , Civil Engineering , Building Materials
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