Abstract
The use of High Performance Fibre Reinforced Cementitious Composites (HPFRCC) allows the designer to reduce the dead weight of roofing keeping concrete covering structures still more competitive in relation to steel structures in terms of costs, thermal and acoustic insulation and fire resistance. Thin slabs can be used as tertiary elements in roof decks beside the spandrel beams and the simply supported prestressed precast roof elements. Two metres wide elements, simply supported along a 2.5 m span were devised as a possible application in this paper: the high performances are mainly used for the bending behavior along the 2.5 m span and in order to drastically simplify the detailing of the support regions. The idea is that of coupling textile and Ultra High Performance Fibre Reinforced Concrete (UHPFRC) technology, by means of an interposed polystyrene layer.
A wide experimental investigation is in progress to mechanically characterize the materials in uniaxial tension and compression, in order to identify all the data needed for design like toughness, bending resistance, fire resistance and durability. As for the UHPFRC, in the research, the check of the ductility and the identification of the mechanical characteristics in tension are performed by means of bending tests carried out on unnotched specimens according to Italian Recommendations CNR DT-204 and of a new test (Double Edge Wedge Splitting test) recently proposed, while third point bending test as suggested in EN14651 is used to classify the material production.
With reference to textile materials, they are reinforced with glass fabric and randomly dispersed glass or PVA fibres. The mechanical characteristics are deduced in uniaxial tension.
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Acknowledgements
The authors thank FUMAGALLI Edilizia Industrializzata S.p.A., BASF and Gavazzi companies for their financial support and the help received from their technicians in the production of the whole set of specimens.
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di Prisco, M., Ferrara, L., Lamperti, M., Lapolla, S., Magri, A., Zani, G. (2012). Sustainable Roof Elements: A Proposal Offered by Cementitious Composites Technology. In: Fardis, M. (eds) Innovative Materials and Techniques in Concrete Construction. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-1997-2_10
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DOI: https://doi.org/10.1007/978-94-007-1997-2_10
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