Prethodno priopćenje

Ultrasonic characterization of cement composites during hydration

Ivan Gabrijel ; Sveučilište u Zagrebu, Građevinski fakultet, Zavod za materijale, Kačićeva 26, 10000 Zagreb, Croatia
Dunja Mikulić ; Sveučilište u Zagrebu, Građevinski fakultet, Zavod za materijale, Kačićeva 26, 10000 Zagreb, Croatia
Nenad Bijelić ; Sveučilište u Zagrebu, Građevinski fakultet, Kačićeva 26, 10000 Zagreb, Croatia

Sažetak

Ultrasonic measurements used to monitor the hydration of cement based materials are becoming an important tool in the quality assurance in production. Also, using these methods can be cost benefit for the construction companies because they can provide information about evolution of material properties in real time. In this paper ultrasonic testing is used to characterize a hydration process of cement paste. A technique is based on the system for measuring the ultrasonic pulse velocity (UPV). To obtain more information about wave propagation characteristics the technique of acoustic emission (AE) is also used. Entire waveform of the signal is recorded. AE parameters are extracted from the signal and used to characterize different processes in cement paste during hydration. An analysis is performed on cement pastes made with different water-cement ratios. Ultrasonic wave parameters are compared to the initial and final setting time using the Vicat needle test and compressive strength development.

Ključne riječi

cement composites; hydration; ultrasonic testing

Hrčak ID:

62925

URI

https://hrcak.srce.hr/62925

Datum izdavanja:

31.12.2010.

Podaci na drugim jezicima: hrvatski

Posjeta: 2.029 *