Effect of a Novel Vibration Mixing on the Fiber Distribution and Mechanical Properties of Ultra-High Performance Concrete

Yangzezhi Zheng, Yang Zhou, Fan Nie, Haoyuan Luo and Xiaoming Huang
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Yangzezhi Zheng: School of Transportation, Southeast University, Nanjing 211189, China
Yang Zhou: School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
Fan Nie: China Electric Power Research Institute, State Grid Corporation of China, Beijing 100192, China
Haoyuan Luo: School of Transportation, Southeast University, Nanjing 211189, China
Xiaoming Huang: School of Transportation, Southeast University, Nanjing 211189, China

Sustainability, 2022, vol. 14, issue 13, 1-16

Abstract: A novel double-axis vibration mixing technology is presented to further enhance the performance of ultra-high performance concrete (UHPC). It improves the problem of inefficient zone in concrete mixing and enhances the homogeneity of concrete through the coupling of vibration and velocity fields during mixing. The X-CT scan results demonstrate that this novel technology improves the fiber distribution coefficient from 0.512 to 0.581. Moreover, the standard deviation of fiber orientation is reduced, the proportion of invalid fibers is decreased, and the pore space distribution is more uniform. The mechanical experimental results show that the new vibration mixing technology improves the mechanical properties of UHPC, and the percentage of early strength improvement is more significant; the impact compressive strength and the toughness of UHPC are also strengthened. The vibration mixing technology is expected to achieve the reduction of raw materials dosage with the same mechanical properties to reduce the cost and carbon emission.

Keywords: ultra-high performance concrete; vibration mixing; fiber distribution; mechanical properties; pore structure (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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