ABSTRACT
Seepage found inside the perimetral gallery and on the downstream face of the Cenza dam since it was originally commissioned did not affect safety requirements but did change the dam’s external appearance and hindered gallery utilisation. It might also cause ageing effects due to the formation of ice in winter.
Waterproofing actions, carried out on the upstream face employing epoxy resin applied to the surface, reduced seepage significantly. An additional cement grouting treatment was carried out at a later stage in the lower section of both abutments to waterproof those areas whose surfaces could not be reached. Works concluded with the drilling of drains for the transverse joints to make residual seepage converge.External waterproofing actions must be designed carefully and monitored closely during their application; a suitable choice of materials is required. The grouting process itself was labour-intensive as it required continuous personal attention.
It was deemed that actions of this kind could be incorporated to the range of potential waterproofing treatments applicable to faces on roller compacted concrete dams.
