Articles

Assessment of Test Methods for Fiber Segregation in Ultra-High Performance Concrete

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Abstract

Fiber segregation affects the homogeneity of ultra-high performance concrete (UHPC) products and thus may negatively affect the mechanical properties of the UHPC in critical portions of any fabricated UHPC component. Practitioners need to be able to assess the fresh property performance of UHPC in order to ensure that fiber segregation is avoided. However, there is no readily available, widely accepted method for real-time evaluation of fiber segregation. This study investigated the fiber segregation in UHPC-class materials with the goal being to identify a rapid and reliable testing method that practitioners can use during quality control and field operations. This study examined the applicability of the available ASTM standards including static column segregation test (ASTM C1610) and static segregation resistance using penetration test (ASTM C1712). A modification to the testing procedures and apparatus has been proposed to make the tests applicable for UHPC-class materials. Results of the fresh material testing were correlated with the visual assessment of hardened samples that were sectioned and analyzed using image processing techniques.

Keywords: UHPC, fiber segregation, quality control

How to Cite:

Mohebbi, A. & Graybeal, B., (2023) “Assessment of Test Methods for Fiber Segregation in Ultra-High Performance Concrete”, International Interactive Symposium on Ultra-High Performance Concrete 3(1): 57. doi: https://doi.org/10.21838/uhpc.16677

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