On-line monitoring of setting and hardening of concrete

The paper deals with the ultrasonic transmission method to determine setting and hardening of cementitious materials. A testing device is described. An important feature of the method is the automatic signal evaluation. To this end, the continuous wavelet transform has been applied. Measurements on mortar with shotcrete accelerator demontrate the applicability of the method. Results are discussed. Further research needs are outlined.

[1]  N. Maeda.  A Method for Reading and Checking Phase Time in Auto-Processing System of Seismic Wave Data , 1985 .

[2]  H. Reinhardt,et al.  Continuous monitoring of setting and hardening of mortar and concrete , 2004 .

[3]  S. Stanchits,et al.  Source analysis of acoustic emissions in Aue granite cores under symmetric and asymmetric compressive loads , 1998 .

[4]  Günther Schmidt,et al.  Verfahren zur untersuchung eines erstarrenden und/oder erhärtenden werkstoffs mittels ultraschalls, aufnahmegefäss und ultraschallgeber zur durchführung des verfahrens , 1999 .

[5]  C. Torrence,et al.  A Practical Guide to Wavelet Analysis. , 1998 .

[6]  Burkhard Buttkus.  Spektralanalyse und Filtertheorie , 1991 .

[7]  H Böhni,et al.  The influence of alkali-free and alkaline shotcrete accelerators within cement systems: I. Characterization of the setting behavior , 2001 .

[8]  E. Kreyszig,et al.  Advanced Engineering Mathematics. , 1974 .

[9]  Jochen H Kurz,et al.  Strategies for reliable automatic onset time picking of acoustic emissions and of ultrasound signals in concrete. , 2005, Ultrasonics.

[10]  Hugo S. Armelin,et al.  Interaction between Accelerating Admixtures and PortlandCement for Shotcrete: The Influence of the Admixture’sChemical Base and the Correlation between Paste Testsand Shotcrete Performance , 1996 .

[11]  D. R. Morgan,et al.  DRY-MIX SILICA FUME SHOTCRETE IN WESTERN CANADA , 1988 .

[12]  Christian U. Grosse,et al.  ULTRASONIC TESTING DEVICE FOR MORTAR ULTRASCHALLMESSEINRICHTUNG FÜR MÖRTEL DISPOSITIF DE TEST ULTRASONIQUE POUR MORTIER , 1999 .

[13]  Guang Ye,et al.  Experimental Study and Numerical Simulation of the Development of the Microstructure and Permeability of Cementitious Materials , 2003 .

[14]  Clifford H. Thurber,et al.  Automatic P-Wave Arrival Detection and Picking with Multiscale Wavelet Analysis for Single-Component Recordings , 2003 .

[15]  Christian U. Grosse,et al.  Ultrasound monitoring of the influence of different accelerating admixtures and cement types for shotcrete on setting and hardening behaviour , 2005 .