Chloride Contamination of Concrete by Interaction with PVC Combustion Gases

Chloride contamination of concrete by interaction with PVC combustion gases has been studied in a small-scale testing chamber, which allows simulating the conditions probably prevailing in PVC fires of different magnitude through variation of the quotient between mass of burnt PVC and exposed concre...

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Bibliographic Details
Published in:Cement and concrete research 1998-02, Vol.28 (2), p.209-219
Main Authors: Climent-Llorca, M.A, Viqueira-Pérez, E, de Vera-Almenar, G, López-Atalaya, M.M
Format: Article
Language:English
Subjects:
Applied sciences
Building technical equipments
Buildings
Buildings. Public works
Concretes. Mortars. Grouts
Exact sciences and technology
Fire behavior of materials and structures
Fire protection
General (composition, classification, performance, standards, patents, etc.)
Materials
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Summary:Chloride contamination of concrete by interaction with PVC combustion gases has been studied in a small-scale testing chamber, which allows simulating the conditions probably prevailing in PVC fires of different magnitude through variation of the quotient between mass of burnt PVC and exposed concrete surface (PVC/S). In all cases, a steep gradient of chloride concentration with depth is found after the fire: most chloride is detected in the outermost layer at depths below 5 mm. Surface chloride contents (within 5 mm) for prestressed and reinforced concretes, tested with a high (PVC/S) ratio, are as high as 2.5 and 5% by weight of cement, respectively. Chloride concentrations in concrete near the steels are below the corrosion thresholds after the fire, but they can rise by diffusion to values able to induce rebar corrosion, especially if concrete is exposed to a humid atmosphere.
ISSN:0008-8846
1873-3948
DOI:10.1016/S0008-8846(97)00270-6