Material Behavior

Investigation of crack speed in ultra-high performance concrete (UHPC) under high speed loading rates

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Abstract

This study looks into the development of cracks and cracking speed in ultra-high performance concrete (UHPC). Pre-notched three-point bending specimens are tested. The main experimental parameters are the fiber volume fraction for UHPC and the rate of loading. Specimens are subjected to slow and high speed loading rates. Slow speed strain rates range from 0.025 to 1.0 1/s. High speed strain load rates range from 6.8 to 41.1 1/s. UHPCs are tested with steel fiber volume contents at 0.0%, 0.5% and 1.0% steel fibers by volume. Notch tip strain and crack speed are computed from the captured data, showing that crack speed increases asymptotically as the crack initiation strain rate increases.

Keywords: industrial by-products, flowability, V-funnel test, compressive strength, ultra high performance concrete (UHPC)

How to Cite:

Alkaysi, M., El-Tawil, S. & Pyo, S., (2016) “Investigation of crack speed in ultra-high performance concrete (UHPC) under high speed loading rates”, International Interactive Symposium on Ultra-High Performance Concrete 1(1). doi: https://doi.org/10.21838/uhpc.2016.89