| SPECIAL TOPIC: UHPC MATERIAL AND ENGINEERING APPLICATION |
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| Rheological Properties of Ultra-high Performance Concrete and Its Effect on the Fiber Dispersion Within the Material |
| ZHANG Qianqian1, 2, LIU Jianzhong1, 2, ZHOU Huaxin1, 2, GUANG Jianmiao1, 2, ZHANG Lihui1, 2, LIN Wei1, 2, LIU Jiaping2, 3
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1 Jiangsu Sobute New Materials Co. Ltd., Nanjing 211103;
2 State Key Laboratory of High Performance Civil Engineering Materials, Nanjing 211103;
3 School of Materials Science and Engineering, Southeast University, Nanjing 210096 |
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Abstract High dispersion is the key to achieve optimum benefits from the fibers for UHPC. In order to understand and improve the fiber dispersion in ultra-high performance concrete (UHPC) with high content of steel fiber (SF), this work employed concrete rheometer, image analysis technology and mechanical properties tests such as compressive strength, flexural strength, to investigate the effects of viscosity-reducing admixture and SF content on UHPC��s mechanical properties, rheological properties and fiber dispersion. Results showed that viscosity-reducing admixture could significantly reduce the UHPC matrix��s yield stress and plastic viscosity, and alleviate the increases of yield stress and plastic viscosity induced by SF addition. Both axial orientation factor and fiber efficiency would decrease by increasing SF content, but increase with the dosage of viscosity-reducing admixture. Our work suggests that the rheological properties, fiber distribution and mechanical properties of UHPC are highly correlated: lower rheological parameters can lead to higher axial orientation factor and higher fiber efficiency, and consequently, higher mechanical properties of the SF-contained UHPC.
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Published: 08 May 2018
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2017, Vol. 31 
