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Author(s): Fiorelli, J., Savastano Junior, H., Tonoli, G. H. D. and Santos, S. F.
Paper category: Conference
Book title: XIII International Conference on Durability of Building Materials and Components - XIII DBMC
Editor(s): Marco Quattrone, Vanderley M. John
Print ISBN: none
e-ISBN: 978-2-35158-149-0
Publication year: 2015
Pages: 449-457
Total Pages: 9
Language: English

Abstract: The durability of fibre-cement roofing sheets is in direct correlation with the type of fibres used, the structure of the matrix, and the curing conditions. This work is comprised of a study of the degradation of polyvinyl alcohol (PVA) and polyethylene terephthalate (PET) fibres in contact with a cement solution (pH~11.5); an evaluation of the methodology for accelerated aging test (200 soak & dry cycles) established by EN 494 (1994); and an evaluation of the influence of certain raw materials as well as natural weathering exposure on the appearance of edge cracks in fibre-cement roofing sheets produced by the Hatschek process and disposed in plastic wrapped piles. The results show that PET fibres presented degradation after approximately one month immersed in a cement solution and with a consequent tensile strength reduction of 53%. With respect to the parameters of the cycles of soaking and drying, the phenomena involved in the inlet and outlet water proved to be distinct from each other, with greater ease of absorption in comparison to drying out water. Corrugated sheets after 24 months of natural weathering exposure in rural area presented higher incidence of cracks on the north face of the stacked roofing sheets, while fibre cement sheets reinforced with PVA fibre and without silica fume in the matrix composition presented lower incidence of edge cracks when compared to other formulations evaluated in this work.

Online publication: 2015
Publication Type: full_text
Public price (Euros): 0.00

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