Fire behaviour of limestone masonry during and after fire
Résumé
The work presented in this paper is part of a larger French project, POSTFIRE, developed following the Notre-Dame Cathedral fire. Six fire resistance tests were performed on 3 m x 3 m x 20 cm thick masonry walls. The tests were performed on 3 stones: Saint Leu (soft stone), Tervoux (firm stone) and Massangis (hard stone). The nature and compressive strength of the mortars were adapted to each stone. The walls were exposed to the standard 834-1 temperature curve for two hours followed by a 24-hour cooling phase. For each stone, one wall was tested without mechanical loading and one with mechanical loading. The applied mechanical loads during the fire test correspond to 50% of the allowable loads calculated according to Eurocode 6. The tests were very extensively instrumented: thermocouples, displacement sensors, digital image correlation, thermal camera and endoscopes. The recordings were made during the heating and cooling phase. At the end of the cooling phase, the walls were loaded again until failure to determine their residual wall bearing capacity. The walls were stored for at least 2 weeks for further observations. The results of the test campaign on the 6 walls made with the 3 stones will be presented.
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