Revealing the Proximity of Concrete Specimens to Their Critical Damage Level by Exploring the Cumulative Counts of the Acoustic Emissions in the Natural Time Domain.

Finally, in Stage IV (0.82 < χ ̄ < 0.98), which is, also, of very small duration (equal to about 0.7 s), the load exhibits a decreasing trend, while the average rate m of the change in CC*(χ) increases abruptly towards its global maximum which, for the specific experiment, is equal to about m ≈ 2.6, attained at the instant of fracture.

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The values of m are now systematically higher than the m = 1 limit, with an increasing trend, which is initially very weak and then it becomes rapid as fracture approaches.

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