Rehabilitation of Deteriorated Bridge Deck Slab by Adhesion of Precast Panels

对用环氧树脂在钢筋混凝土桥面板上粘贴薄板预制板的劣化桥面板修复方法进行了试验研究，制作了梁式和板式模型试件，加载至最终倒塌，检验了该方法的实用性。得出的主要结论如下：1)将两片石板粘贴在混凝土面板表面，是一种非常有效的桥面修复方法。原因是胶层不仅起到了物理强化的作用，而且还起到了防水涂层的作用。桥面疲劳寿命在很大程度上是由于后一种修复方法的影响而延长的。2)采用这种修复方法的试件在静载作用下的强度和延性大大提高。与相同尺寸的普通钢筋混凝土试件相比，变形能力有显著提高。3)在局部粘结试验中，当各板的粘结面积小于25%时，静强度下降。4)当温度高于60℃时，强度随温度的升高而降低。5)胶合表面的水分含量对变形性能有很大影响。在涂胶操作过程中，表面必须尽可能保持干燥。

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.