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Influence of cement type and aggregate shape on explosive concrete spalling



Title: Influence of cement type and aggregate shape on explosive concrete spalling
Author(s): J. Kirnbauer and U. Schneider
Paper category : conference
Book title: 2nd International RILEM Workshop on Concrete Spalling due to Fire Exposure
Editor(s): E.A.B. Koenders and F. Dehn
ISBN: 978-2-35158-118-6
e-ISBN: 978-2-35158-119-3
Publisher: RILEM Publications SARL
Publication year: 2011
Pages: 411 - 418
Total Pages: 8
Nb references: 3
Language: English


Abstract: The technical report deals with the results of concrete spalling due to fire attack. The influence of different types of cement and round or crashed aggregates was studied under the ISO standard fire curve and tunnel fire curve. The types of cement used are CEM I 42,5 R, CEM II A-L 42,5 N and Slagstar®, which is a special sulphate slag cement. The test results showed significant differences of concrete spalling between the different cement types. The differences observed concern the explosion behaviour, the time period after the start of fire until spalling occurs, the period of spalling and the loss of matter from the hot surface of the test specimen. The motivation for investigations into the influence of the aggregate shape on spalling resulted from fire tests performed within the framework of the EU project CORPTUS. The concrete specimens with crushed dolomite aggregates showed a higher sensitivity under fire attack than the calcitic gravel concrete with round aggregates. Therefore additional tests were performed using aggregates (round shape) and crushed aggregates (edge shape) prepared from the same gravel. In this case the test results indicated that concrete with crushed aggregates is more sensitive to spalling than concrete with round aggregates.


Online publication: 2012-01-17
Publication type : full_text
Public price (Euros): 0.00