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- 2011 (2) (entfernen)
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- Englisch (2)
Schlagworte
- Acoustic emission (1)
- Climate data (1)
- Gas pore pressure (1)
- High temperature (1)
- Marble sculptures (1)
- Marble weathering (1)
- Numerical simulations (1)
- Ordinary concrete (1)
- Spalling (1)
- Winter cover (1)
Monitoring of fire damage processes in concrete by pore pressure and acoustic emission measurements
(2011)
This paper presents the combined use of acoustic emission (AE), gas pore pressure and temperature measurements (PT). The simultaneous application of both techniques represents a new methodology in the context of fire spalling and contributes to a better understanding of the mechanisms of fire spalling, particular with regard to the interaction of micro cracking and pore pressure evolution. The study presents fire tests on normal strength concrete specimens with and without reinforcement at ISO Standard fire and at hydrocarbon (HC) fire. Supported by AE-analysis, it can be shown that due to the higher heating rate of the HC-fire in comparison to the ISO Standard fire the damage processes inside the concrete during the exposure are increased combined with augmenting the concrete permeability. As a consequence lower pore pressures were measured. However, despite the lower pore pressures, explosive spalling was observed.
The present study documents the results of an
inter-disciplinary model project that was planned with the
aim of developing an innovative winter covering system
for marble statuaries located on the Schlossbru¨cke (Berlin).
Such a system would need to fulfil the various requirements
for structural stability, aesthetics, climate and practical
use. This applied research represents the first complex
scientific study of the sustainability of a winter covering
system. The study is characterised by the use of complex
scientific instruments such as special laboratory analysis
and numerical simulation tools. The interaction between
the environment and the artefacts in connection with the
innovative winter covering structures were studied by
extensive climatic monitoring.