Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Acoustic emission characterisation of cementitious wasteforms under three-point bending and compression
Correlation was observed between load of failure, curing age and energy of recorded acoustic emission (AE) signals from OPC and BFS (blastfurnace slag)/OPC (ordinary Portland cement) (at mass ratio 7:3) samples in three-point I bending tests. The released stress energy was concentrated in single distinctive, high amplitude signals (up to 10 V at the piezoelectric sensor output) with primary frequencies below 50 kHz and an amplitude spectrum spread from 20 to 1000 kHz. The fracture surfaces showed brittle-like failure with a significant role of pre-existing microcracks. AE responses of OPC and 7:3 BFS/OPC samples showed Kaiser's effect during three consecutive loading-unloading cycles under compression before the ultimate strength of the structures to be reached. The strains measured during the loading-unloading cycles were used to determine the elastic modulus and Poisson ratio of the monitored wasteforms enabling 1 calculation of the velocities of the longitudinal and transverse ultrasonic waves.
Acoustic emission characterisation of cementitious wasteforms under three-point bending and compression
Correlation was observed between load of failure, curing age and energy of recorded acoustic emission (AE) signals from OPC and BFS (blastfurnace slag)/OPC (ordinary Portland cement) (at mass ratio 7:3) samples in three-point I bending tests. The released stress energy was concentrated in single distinctive, high amplitude signals (up to 10 V at the piezoelectric sensor output) with primary frequencies below 50 kHz and an amplitude spectrum spread from 20 to 1000 kHz. The fracture surfaces showed brittle-like failure with a significant role of pre-existing microcracks. AE responses of OPC and 7:3 BFS/OPC samples showed Kaiser's effect during three consecutive loading-unloading cycles under compression before the ultimate strength of the structures to be reached. The strains measured during the loading-unloading cycles were used to determine the elastic modulus and Poisson ratio of the monitored wasteforms enabling 1 calculation of the velocities of the longitudinal and transverse ultrasonic waves.
Acoustic emission characterisation of cementitious wasteforms under three-point bending and compression
Charakterisierung zementhaltiger Abfallgebinde unter Drei-Punkt-Biegung und Kompression mittels akustischer Emission
Spasova, Lyubka M. (Autor:in) / Ojovan, Michael I. (Autor:in)
2009
8 Seiten, 10 Bilder, 11 Quellen
Aufsatz (Konferenz)
Englisch
Role of Carbonation in Long-term Performance of Cementitious Wasteforms
| British Library Conference Proceedings | 1997
Single Phase Ceramic Wasteforms for Plutonium Disposition
| British Library Conference Proceedings | 2006