A B S T R A C T R I~ S U M I ~An almost fully automated device has been developed which is suitable for the continuous monitoring of setting and hardening of cement paste and fresh mortar. Some special features are presented and discussed with respect to the reliable contact of ultrasound transmitter and recorder. The analysis of the US signals employs a modified Hinkley criterion.
Un appareil presque entibrement automatis( a (t~ d(ve-
Acoustic emission (AE) signals and relative displacementswere simultaneously recorded on pull-out specimens subjected to monotonic, cyclic and long-term loads. The bond length was twice the rib spacing. Most of the signals were observed during an increase in load or applying the cyclic load, however, signals were recorded during cycling and under constant load as well. The .4E signal patterns were compared by applying the coherence spectrum analysis based on Fourier transforms of the signals. The internal damage accumulation, defined as the cumulative A E amplitudes, showed sirnilar tendencies to the slip development both under cyclic and long-term loads.
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