ULTRASONIC CHARACTERIZATION OF CEMENT COMPOSITES DURING HYDRATION

• Published in: Tehnički vjesnik Vol. 17; no. 4; pp. 493 - 497
• Main Authors: Gabrijel, I, Mikulic, D, Bijelic, N
• Format: Journal Article
• Language: English
• Published: 01.12.2010
• Subjects: Cements; Compressive strength; Hydration; Monitors; Pastes; Ultrasonic testing; Wave propagation
• ISSN: 1330-3651

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 a cost benefit for construction companies because they can provide real time information about evolution of material properties. In this paper ultrasonic testing is used to characterize the hydration process of cement paste. The 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. The 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. The analysis is performed on cement pastes made with different water-cement ratios. Ultrasonic wave parameters are compared with the initial and final setting time using the Vicat needle test and compressive strength development.Original Abstract: Koristenje ultrazvucnih mjerenja za pracenje hidratacije materijala na bazi cementa postaje vazan alat osiguranja kyalitete u proizvodnji.Takoder, koristenjetih metoda moze biti ekonomski isplativo za izvodacke tvrtke jer omogucavaju tremimo dobivanje informacija o razvoju svojstava matcrijala. U ovom radu ispitivanje ultrazvukom je primijenjeno za karakterizaciju procesa hidratacije cementne paste. Metoda mjerenja temeljena je na sustavu za mjerenje brzine ultrazvucnog impulsa (UPV). Kako bi se dobilo vise informacija o svojstvima sirenja valova koristenaje i metoda akusticne emisije (AE). Cijeli valni zapis je sniman te su iz signala izracunati parametri akusticne emisije koji su koristeni za karakterizaciju razlicitih procesa u cementnoj pasti tijekom hidratacije. Analiza je provedena na cementnim pastama izradenim s razlicitim vodo-cementnim omjerima. Parametri ultrazvucnih valova usporedeni su s pocetkom i krajem vezanja dobivenim Vicatovom iglom i razvojem tlacne cvrsto6e.