1,721,227 research outputs found
Relationships between fibre distribution, workability and the mechanical properties of SFRC applied to precast roof elements
No full textA series of 40 precast prestressed roof elements was cast, employing a self-compacting steel fibre reinforced concrete (SCSFRC). They are being used in an industrial building. The fibre distribution within the roof elements was investigated by means of a suitable test procedure and correlated with results obtained from cube samples drawn from the batches and tested in the fresh state. Companion slabs were also cast and tested under four point bending, in order to study the correlation between fibre distribution and the mechanical properties of the composite. The work presented here analyses the correlation between fibre distribution, workability and mechanical properties of steel fibre reinforced concrete (SFRC) with the aim of optimising both its fresh- and hardened-state properties for a series production of precast SFRC roof elements
Riparazione di travi in c.a. danneggiate da incendio con incamiciature in calcestruzzi fibrorinforzati ad elevate prestazioni.
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Strengthening of shear wall with high performance RC jacket
No full textA new technique for the strengthening of existing R/C shear walls based on the application of thin high performance jackets is presented in this paper. The strengthening jacket is made of high performance concrete, having a compression resistance higher than 150 MPa, and reinforced by means of an high strength steel mesh. The experimental study is carried out on a 1:3 scale R/C wall, proportioned to resist the vertical loads only, and reinforced by means of a 15 mm thick high performance jacket. Cyclic loads of increasing magnitude are applied to the experimental shear wall up to collapse. The experimental results show the efficiency of the proposed strengthening solution. The strengthening jacked allow doubling the structure resistance, and the structure ductility is increased up to nine times the ductility of the unreinforced structure. The remarkable increase in the structure ductility is the result of the large deformability of the jacket and the absence of strain localization. © 2009 Taylor & Francis Group
Seismic retrofitting of existing shear walls by means of high performance RC jacket
No full textA new technique for the strengthening of existing R/C shear walls based on the application of very thin high performance jackets is presented in this paper. The strengthening jacket is made of high performance concrete and high strength steel mesh. The experimental study on a 1:3 scale R/C wall, proportioned to resist the vertical loads only, and reinforced by means of a 15 mm thick high performance jacket is presented. The effectiveness of the technique is also verified numerically. The results show the efficiency of the proposed solution in significantly increasing the structure resistance, deformation capacity and ductility
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