Susilorini, Retno (2008) THE ADVANTAGE OF NYLON MESH FOR BEAM CONFINEMENT Smart material for beam repair. Proceedings of ICRMCE 2009.

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Abstract

Indonesia faces the hazard of earthquake disaster, so that the structure resistant becomes the main concern in rehabilitation and repair. The rehabilitation of concrete structure element covers many aspects, one is the ductility performance. Achieving the ductility means improving the structural performance; therefore a special need should be fulfilled in repairing the concrete structure element. Previous researches have emphasized that the using of confinement will increase the ductility of concrete beam. Some materials have been applying to confine the beam such as steel, rubber, synthetic fiber, etc. A promising material which can be used for beam confinement is nylon as proved by previous research. It has great value of tension strength and elongation. The nylon also has unique characteristic of ‘yield point elongation’ that provides optimal stable crack length when it is embedded in cementitious matrix. According to the advantage of nylon, this research wants to deliver another advantage of nylon, in the form of nylon mesh, when it is used as beam confinement. This research uses experiment method and analytical method. The experiment method is conducted by third point flexural test of 2 kind of concrete beams (confined and unconfined beams) with dimension of 15x20x600 mm with compressive strength f’ c about 30 MPa. The analytical method computes the modulus of rupture of beams and also observes the crack pattern of beams. The research meets several conclusions: (1) The ultimate load of confined beams increase about 30-40% (1489,6 N, 1421 N) compared to the unconfined ones while its displacement also increase about 40-70% (24 mm, 26,7 mm); (2) The increase of displacement emphasizes that the ductility of beams also increases at ultimate load until beams collapse; (3) The modulus of rupture of confined beams increase about 30-40% (22,8 MPa and 21,75 MPa) compared to the unconfined ones; (4) The ductility of beams is clearly maintained by the nylon mesh confinement; (5) It is proven that the nylon mesh has improved modulus of rupture of the beams significantly; and (6) The research has proved that the using of nylon mesh as beam confinement obviously increase the ductility of beam. It is emphasized that the nylon as smart material has advantage for structural concrete element repair.

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