Rehabilitation of Deteriorated Bridge Deck Slab by Adhesion of Precast Panels

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Experimental studies were made on the rehabiltation method of deteriorated bridge deck slab where thin precast panels were glued on the reinforced concrete slab deck with epoxy resin.Beam and slab type model specimens were made and loaded to the ultimate collapse and the utility of this developed method was examined. Principal conclusions derived are as follows ;1) The method, which consists of two sheets of slate plates glued on the surface of concrete slab, is cocluded to be very effective in rehabilitation of bridge deck. The reason is that the glued layrs play the roll of not only physical strengthening but also water proof coating. Fatigue life of bridge deck becomes longer largely by the effect from the latter.2) Specimens with this rehabilitaion method largely increased their strength and ductility under static loading. The increase of deformation capacity was remarkable in comparison with the ordinary reinforced concrete specimen of the same dimension.3) In the tests of partial bonding, static strength decreased when the glued area in each plate became less than 25%. However, it did not seem to be affected when it was over 50%.4) The strength reduction by high temperature was observed when the temperature was higher than 60 C.5) Moisture content of the glued surface affected largely on the deformation property. The surface must be kept as dry as possible in the course of gluing operation.