Continuous monitoring of setting and hardening of mortar and concrete

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Possibilities of using the ultrasonic wave transmission method to estimate initial setting time of cement paste (2008, unknown): “Reinhardt et al. [4, 5] evaluated changes in the material properties associated with concrete aging by using the velocity of elastic waves, energy, and frequency distribution of obtained waves.”
Ultrasound monitoring of the influence of different accelerating admixtures and cement types for shotcrete on setting and hardening behaviour (2005, methodology): “Practical experience showed that the final setting time could be defined by an ultrasound velocity of 1500 m/s [11].”
Comparison of ultrasonic wave transmission and reflection measurements with P- and S-waves on early age mortar and concrete (2005, methodology): “A schematic of the container used for the wave transmission measurements with mortar is shown in Fig. 1. The method is protected by a US-patent [5] and further details about this test setup and its application are given in [ 6 ].”
Microstructure and mechanical properties of β-hemihydrate produced gypsum: an insight from its hydration process (2011, methodology): “More detailed information about the FreshCon system and the measurement procedure was presented in [18].”