An experimental study was performed on different types of steel fiber reinforced concrete withtheobjectiveofmeasuringthechangesinenergydissipationmechanismsasafunctionofloading rate and fiber alignment. 50-mm diameter split-cylinder specimens were prepared with steel fibers, steel wool fibers, and a combination of both. Specimens were loaded at two…
An experimental study was performed on different types of steel fiber reinforced concrete withtheobjectiveofmeasuringthechangesinenergydissipationmechanismsasafunctionofloading rate and fiber alignment. 50-mm diameter split-cylinder specimens were prepared with steel fibers, steel wool fibers, and a combination of both. Specimens were loaded at two rates, from quasi-static to high rate servo-hydraulic. Each specimen was scanned using x-ray computed tomography (CT) both before and after loading such that internal damage could be measured. Crack measurements weremadethrougha3Danalysisofload-inducedcrackareausingahybridedge-detection/connected components analysis (macrocrack analysis). 3D digital volume correlation was applied to measure strains such that damage below the crack detection threshold could be inferred (microcrack analysis). Preliminary results showed that specimens loaded at a higher rate tended to show a higher degree of microcracking relative to macrocracking. However, this variation was of a similar order of magnitude to the variation obsrved due to differences in fiber alignment.