National Building and Civil Engineering Institute, Lj (ZAGLJ)
13.
Ultrasonic assessment of initial compressive strength gain of cement based materials
Trtnik, Gregor ; Gams, Matija
In this paper, a possibility of using frequency spectrum of ultrasonic P-wavesto determine very early age compressive strength (fc) of cement based materials (CBMs) is analyzed. TG parameter, ...representing the ratio between maximum amplitudes of high and low frequency ranges that appear in the frequency spectrum of the transmitted signal, is used to observe the changes in the spectrum. Both fc and TG start to increase simultaneously and later develop according to similar trend. Thus, strong correlation between fc and TGis established, regardless of the CBM's composition. By comparing stress-strain curves and time derivatives of TG-t curves, the stage when the material is clearly plastic and stage when material exhibits solid behavior, can be distinguished. These results explain physical meaning of TG parameter in more detail and expand the range of practical applications of methods basedon spectral analysis of transmitted P-waves.
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