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dc.contributor.author
Klingsch, Eike
dc.contributor.author
Frangi, Andrea
dc.contributor.author
Fontana, Mario
dc.date.accessioned
2017-11-02T10:10:47Z
dc.date.available
2017-06-11T05:18:26Z
dc.date.available
2017-11-02T10:10:47Z
dc.date.issued
2013-12
dc.identifier.uri
http://hdl.handle.net/20.500.11850/80843
dc.identifier.doi
10.3929/ethz-a-010076314
dc.description.abstract
A sufficient resistance of concrete structures to fire was always taken for granted. The concrete’s low thermal conductivity ensures an overall good thermal protection of the concrete’s reinforcement, even during longer fire impact. In contrast to ordinary performance concrete used in most structures, the behavior of high (HPC) and ultra-high performance concrete (UHPC) at high temperatures exhibits an increased tendency to explosive spalling and must be considered as critical. Explosive spalling might occur at high temperatures, leading to a direct fire exposure onto the reinforcement steel and a reduction of the cross section. The risk of explosive spalling of HPC and UHPC can be reduced with a modified concrete mixture including polypropylene fibers (PP-fibers); however, temperature-related damage cannot be excluded in general. Another possibility is the use of fire protective concrete linings, acting as a thermal barrier or narrow spaced stirrups. However, their application is still difficult due to the lack of existing design criteria. Within the framework of a research project at the Institute of Structural Engineering (IBK) at ETH Zurich, several tests on the analysis of the risk of temperature-related explosive spalling of HPC and UHPC was carried out. In this report, the explosive spalling of unprotected concrete cylinders (ø = 150 mm, h = 300 mm) was investigated using linear heating. Chapter 2 describes these tests. In chapter 3, the behavior of HPC and UHPC containing PP-fibers was analyzed. Different amounts of PP-fibers with varying fiber geometry were tested with the same base concrete mixture. The influence of the PP-fiber’s geometry on the intensity of explosive spalling was clearly indicated. Tests on the porosity and permeability of concrete after cooling from high temperatures are described in chapters 4 and 5. Small concrete fragments (l = 4 mm) were used to determine the cumulative pore volume using mercury intrusion porosimetry. Concrete before and after explosive spalling was analyzed, as well as the influence of PP-fibers on the porosity at different temperature levels. Tests on permeability are described in chapter 5. The gas permeability was analyzed for concrete discs (ø = 150 mm, h = 40 mm) at room temperature, after cooling from high temperatures of up to T = 500°C. The influence of steel and PPfibers on the concrete’s permeability was studied in these tests. Chapter 6 deals with the use of protective linings on concrete structures. The required material properties as input material properties for modeling and dimensioning of the linings were determined experimentally and analyzed. A description of tests on UHPC slabs (l • w • h = 1100 • 900 • 150 mm3) protected either with PP-fibers or protective lining is presented in the last part of this report (chapter 7). These slabs were heated according to the standardized ISO-fire curve [1] for a period of t = 120 min. The present test report describes the test set-up for all experimental investigations and summarizes the results. Further analysis or design models will be given in a research publication.
en_US
dc.language.iso
en
en_US
dc.publisher
Institut für Baustatik und Konstruktion der ETH Zürich
en_US
dc.rights.uri
http://rightsstatements.org/page/InC-NC/1.0/
dc.subject
High performance concrete (HPC)
en_US
dc.subject
Explosive spalling
en_US
dc.subject
BEWEHRUNGSFASERN (BAUSTOFFE)
en_US
dc.subject
HIGH STRENGTH CONCRETE (BUILDING MATERIALS)
en_US
dc.subject
Mercury intrusion porosimetry
en_US
dc.subject
PLASTERS + RENDERS (BUILDING MATERIALS)
en_US
dc.subject
HOCHFESTER BETON (BAUSTOFFE)
en_US
dc.subject
PP-fibers
en_US
dc.subject
Permeability
en_US
dc.subject
Steel fibers
en_US
dc.subject
ISO-fire tests
en_US
dc.subject
Ultra-high performance concrete (UHPC)
en_US
dc.subject
Protective lining
en_US
dc.subject
FIRE BEHAVIOUR AND FIRE RESISTANCE OF BUILDING ELEMENTS AND MATERIALS (FIRE FIGHTING AND PROTECTION)
en_US
dc.subject
REINFORCEMENT FIBRES (BUILDING MATERIALS)
en_US
dc.subject
PUTZE + PUTZMASSEN + VERPUTZE (BAUSTOFFE)
en_US
dc.subject
BRANDVERHALTEN UND FEUERFESTIGKEIT VON BAUSTOFFEN UND BAUMATERIALIEN (BRANDBEKÄMPFUNG UND BRANDSCHUTZ)
en_US
dc.title
Explosive spalling of concrete in fire
en_US
dc.type
Report
dc.rights.license
In Copyright - Non-Commercial Use Permitted
dc.date.published
2014
ethz.title.subtitle
Test report
en_US
ethz.journal.title
IBK Bericht
ethz.journal.volume
351
en_US
ethz.size
118 p.
en_US
ethz.code.ddc
6 - Technology, medicine and applied sciences::690 - Buildings
en_US
ethz.code.ddc
6 - Technology, medicine and applied sciences::620 - Engineering & allied operations
en_US
ethz.identifier.nebis
010061806
ethz.publication.place
Zürich
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02115 - Dep. Bau, Umwelt und Geomatik / Dep. of Civil, Env. and Geomatic Eng.::02605 - Institut für Baustatik u. Konstruktion / Institute of Structural Engineering::08809 - Frangi, Andrea (Tit.-Prof.)
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02115 - Dep. Bau, Umwelt und Geomatik / Dep. of Civil, Env. and Geomatic Eng.::02605 - Institut für Baustatik u. Konstruktion / Institute of Structural Engineering::03352 - Fontana, Mario / Fontana, Mario
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02115 - Dep. Bau, Umwelt und Geomatik / Dep. of Civil, Env. and Geomatic Eng.::02605 - Institut für Baustatik u. Konstruktion / Institute of Structural Engineering
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02115 - Dep. Bau, Umwelt und Geomatik / Dep. of Civil, Env. and Geomatic Eng.::02605 - Institut für Baustatik u. Konstruktion / Institute of Structural Engineering::08809 - Frangi, Andrea (Tit.-Prof.)
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02115 - Dep. Bau, Umwelt und Geomatik / Dep. of Civil, Env. and Geomatic Eng.::02605 - Institut für Baustatik u. Konstruktion / Institute of Structural Engineering::03352 - Fontana, Mario / Fontana, Mario
ethz.date.deposited
2017-06-11T05:21:28Z
ethz.source
ECOL
ethz.source
ECIT
ethz.identifier.importid
imp59366b520179859984
ethz.identifier.importid
imp593651a707af863521
ethz.ecolpid
eth:8054
ethz.ecitpid
pub:126975
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-15T03:04:56Z
ethz.rosetta.lastUpdated
2017-11-02T10:10:56Z
ethz.rosetta.versionExported
true
ethz.COinS
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