TY - CONF A1 - Babski, Veronika A1 - Hüsken, Götz A1 - Pirskawetz, Stephan A1 - Ehlers, Noah A1 - Kühne, Hans-Carsten A1 - Brouwers, H.J.H. ED - Fehling, E. ED - Middendorf, B. ED - Thiemicke, J. T1 - Characterisation of Ultra-High Performance Fibre Reinforced Concrete (UHPFC) under tensile loading by acoustic emission and optical deformation analysis N2 - During the past 20 years, innovative developments in concrete technology have enabled the production of ultra-high performance fibre reinforced concretes (UHPFC) for the protection and preservation of concrete structures. The main characteristics of UHPFC comprise high compressive and flexural strength as well as high ductility compared to normal strength, normal weight concrete (NSC). This paper focuses on the analysis of crack formation and crack propagation in UHPFC under tensile loading under quasistatic conditions by using acoustic emission (AE) and optical deformation analysis (ODA). AE is a non-destructive technique to monitor the development of micro structural damage processes caused by external forces. In this context, AE allows for a continuous monitoring of changes in the microstructure (cracks) over time and the corresponding localisation by appropriate algorithms. The AE measurements were performed along with ODA at the surface of the samples in order to analyse the deformation behaviour of the samples and the crack propagation. For the tests, a UHPFC reference mixture was developed and tested with three different volume percentages of steel fibres (1.0 V.-%, 2.0 V.-%, and 3.0 V.-%). This paper shows that the application of AE is a suitable method to analyse the crack propagation in UHPFC specimens under tensile loading and to localise the crack initiation. Furthermore, insights into the failure mechanism of the fibres are offered by the analysis of the signals of the AE measurements, which allows for a better understanding of UHPFC and its general performance. T2 - 4th International Symposium on Ultra-High Performance Concrete and High Performance Materials (HiPerMat) CY - Kassel, Germany DA - 09.03.2016 KW - UHPFC KW - Tensile loading KW - Acoustic emission KW - Crack formation KW - Optical deformation analysis KW - Crack propagation PY - 2016 SN - 978-3-7376-0094-1 SP - 1 EP - 9 PB - Kassel University Press CY - Kassel AN - OPUS4-36893 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -