Fire Protection of Concretes: Formulation, Performances and Pathology

Abstract:

The efficiency of thin mineral passive fire protection layer applied on concrete is analyzed. The more suitable fireproofing material formulations are selected from results of laboratory scale fire test. Such tests consist in the direct exposure of protected concrete samples to the flame of a burner, at constant temperature (850°C). Various formulations of mineral fireproofing materials have been tested to identify the effects of binder type and the density. Formulation compromises are highlighted regarding requested fire performances. Selected formulations are used to protect real scale concrete slab exposed to standard fire (ISO 834). During the test, the concrete/fire protection layer interface temperature and the steel reinforcement temperature have been recorded. For small size slabs, fire proofing layer is completely efficient. The temperature increases are strongly delayed. For large size slabs, delamination of fire proofing layer appears, leading to rapid concrete degradation. To understand the mechanics of cracking and delamination of fire protection layer, laboratory scale tests are performed with two selected formulations varying the implementation methods (surface treatment of concrete, intervention on interface roughness, pre-cracking...). It appears that the occurrence of fire protection layer delamination can be avoided choosing the optimal implementation method without adjustment of the optimized formulations.

• Periodical: Key Engineering Materials (Volume 711)
• Pages: 767-774
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.711.767
• Online since: September 2016
• Authors: Christophe Lanos*, Christophe Baux, Yannick Melinge
• Keywords: Fireproofing Materials, Heat Transfer, Mineral Compounds, Thermal Shrinkage

References

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