Project: HE Đerdap 1, Dilatation S2-S3, Wet Gallery
Investor: JP Đerdap, Kladovo, Srbija
Works: Repair of dilatation in the wet gallery

State of the structure: Dilatations between blocks 2 and 3 in the area of dry and wet gallery were done with a triple waterstop tape. Damage and water leakage were observed soon after the completion of construction (1972), and over time
the amount has increased significantly and progresses (more than 100 l/sec during winters). Attempts to close dilatation have been made, we found embedded injection pipes in the damaged area.

The process of restoration: injection of Euras mortar into expansion zone was performed, in dry and later in wet gallery. It was previously covered with expanded metal strips with holes that retain 4.0 to 8.0 mm fraction and was temporarily fixed with a subframe. Water in dilatation had a water column of more than 40 m (bottom water) and performed the partial flush of injected mortar whose fraction of d>4 mm remained on the metal and in some parts it completely stayed. Such embedded layer eased the water impact and became a drainage layer. Euras Gel type B was supplemented by injection and it restored insulating properties of the injection mortar where it was needed. In the area above this layer we injected Euras Gel and, being heavier than water (1.12 to 1.15 g/ cm3), it formed a fluid insulating layer resting on a layer of plaster on one side, and pressed with the water column on the other. Such a hydraulic seal follows all movements of dilatation and functions smoothly.

Construction was taken away by an unknown suspect before the final fixing the sliding anchors, and has not been renewed.