A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Improved ultrasonic wave reflection technique to monitor the setting of cement-based materials
A test setup using the ultrasonic wave reflection technique is used to monitor the hydration process of early-age cement-based materials throughout their setting and hardening. The focus of the investigation presented here is the monitoring of the stiffening behavior of cement pastes. Specimens are produced and kept under constant curing conditions. Immediately after placing the cement paste the data collection starts and continues throughout the setting process. The obtained ultrasonic data are correlated to mechanical and chemical properties of the specimens. Based on the presented research, the following conclusions are drawn: 1. A reliable non-destructive test setup using a modified ultrasonic wave reflection technique (WRF) is developed for the evaluation of the hydration process of early-age cement-based materials. 2. The occurrence of initial set and final set of cement paste can be detected with high accuracy using WRF. 3. The minimum of DQ, the numerical derivative of WRF, coincides with the initial set of the cement. 4. The zero-crossing of the DQ coincides with the final set of the cement paste. 5. The influence of the cement type on the initial set and final set times can be detected non-destructively with WRF. 6. The influence of blast furnace slag content on the initial set and final set times can be detected with WRF.
Improved ultrasonic wave reflection technique to monitor the setting of cement-based materials
A test setup using the ultrasonic wave reflection technique is used to monitor the hydration process of early-age cement-based materials throughout their setting and hardening. The focus of the investigation presented here is the monitoring of the stiffening behavior of cement pastes. Specimens are produced and kept under constant curing conditions. Immediately after placing the cement paste the data collection starts and continues throughout the setting process. The obtained ultrasonic data are correlated to mechanical and chemical properties of the specimens. Based on the presented research, the following conclusions are drawn: 1. A reliable non-destructive test setup using a modified ultrasonic wave reflection technique (WRF) is developed for the evaluation of the hydration process of early-age cement-based materials. 2. The occurrence of initial set and final set of cement paste can be detected with high accuracy using WRF. 3. The minimum of DQ, the numerical derivative of WRF, coincides with the initial set of the cement. 4. The zero-crossing of the DQ coincides with the final set of the cement paste. 5. The influence of the cement type on the initial set and final set times can be detected non-destructively with WRF. 6. The influence of blast furnace slag content on the initial set and final set times can be detected with WRF.
Improved ultrasonic wave reflection technique to monitor the setting of cement-based materials
Verbesserte Ultraschallwellen-Reflexionstechnik zur Beobachtung des Abbindens von zementhaltigen Werkstoffen
Öztürk, T. (author) / Kroggel, O. (author) / Grübl, P. (author) / Popovics, J.S. (author)
NDT&E International ; 39 ; 258-263
2006
6 Seiten, 8 Bilder, 2 Tabellen, 12 Quellen
Article (Journal)
English
| British Library Conference Proceedings | 2005
| British Library Online Contents | 2005
Setting Time Measurement Using Ultrasonic Wave Reflection
| British Library Online Contents | 2012
Setting Time Measurement Using Ultrasonic Wave Reflection
| Online Contents | 2012