SEM-based push-out tests were performed for interfacial characterization of fibre reinforced cement composites. The range of experiments covered strands of zirconia glass filaments of diameters ranging from 13 to 15 µm and cementitious matrices modified with various mineral additives.

The push-out tests were performed on thin slices, about 450-600 µm, cut out of the specimens perpendicularly to the direction of glass filaments. During testing a continuous recording of load and displacement of the fibre was performed at a constant push velocity of about 0.2 µm/s. In order to evaluate a significance of wear of the interface a push-back testing was also performed. Simultaneous observation of push-out or push-back events was possible at SEM resolution rates.

Test results revealed significant differences due to introduced matrix modifications as well as to aging of specimens. Both stress-based approach and energy-based approach was applied for the analysis of interfacial properties. Obtained results could be well correlated to the phenomena observed in flexural toughness testing and SEM/EDX and XRD data obtained in an accompanied research program.

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