A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Development of hybrid fibre-cement corrugated sheets: A case study of edge cracks
This experiment investigates systematically the occurrence of edge cracks in the piles of fibre cement corrugated sheets due to stresses generated in the long term during the free water evaporation and the consequent dimensional variation suffered by the stacked sheets before their definitive installation on a roofing structure. This work presents a case study evaluating the influence of some raw materials applied in the composite formulation and natural weathering exposure on the occurrence of edge cracks in the hybrid fibrecement corrugated sheets produced by the Hatschek process. This work evaluated approximately 1200 hybrid fibre cement roofing sheets in different formulations with polyvinyl alcohol (PVA) and polypropylene (PP) fibres, as well as the combination of the two fibres, with and without silica fume. The hybrid fibre cement corrugated sheets were submitted to over 24 months of natural weathering exposure simulating the behaviour of stockpiles in the rural environment in the State of Säo Paulo, Brazil. The results show that the highest incidence of cracks occurs on the covering wave of the corrugated sheet pile after 9 months of weather exposure. However, fibre cement sheets reinforced with PVA fibre and without silica fume exhibited less edge cracks compared to other formulations evaluated in this work. Consequently, it was observed that the contribution of silica fume in some of the cement matrices remained inconclusive. It was also found that edge cracks do not have a significant effect on the flexural behaviour of the hybrid fibre cement roofing tiles.
Development of hybrid fibre-cement corrugated sheets: A case study of edge cracks
This experiment investigates systematically the occurrence of edge cracks in the piles of fibre cement corrugated sheets due to stresses generated in the long term during the free water evaporation and the consequent dimensional variation suffered by the stacked sheets before their definitive installation on a roofing structure. This work presents a case study evaluating the influence of some raw materials applied in the composite formulation and natural weathering exposure on the occurrence of edge cracks in the hybrid fibrecement corrugated sheets produced by the Hatschek process. This work evaluated approximately 1200 hybrid fibre cement roofing sheets in different formulations with polyvinyl alcohol (PVA) and polypropylene (PP) fibres, as well as the combination of the two fibres, with and without silica fume. The hybrid fibre cement corrugated sheets were submitted to over 24 months of natural weathering exposure simulating the behaviour of stockpiles in the rural environment in the State of Säo Paulo, Brazil. The results show that the highest incidence of cracks occurs on the covering wave of the corrugated sheet pile after 9 months of weather exposure. However, fibre cement sheets reinforced with PVA fibre and without silica fume exhibited less edge cracks compared to other formulations evaluated in this work. Consequently, it was observed that the contribution of silica fume in some of the cement matrices remained inconclusive. It was also found that edge cracks do not have a significant effect on the flexural behaviour of the hybrid fibre cement roofing tiles.
Development of hybrid fibre-cement corrugated sheets: A case study of edge cracks
Fiorelli, Juliano (author) / Francico dos Santos, Sergior (author) / Donizete, Paulo (author) / Cabral, Matheus Roberto (author) / Dias de Freitas, Zaqueu (author) / Savastano, Holmer jun. (author)
2012
7 Seiten, 7 Bilder, 2 Tabellen, 6 Quellen
Conference paper
English
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