Causes of Filtration the Water in Roller Compacted Concrete Dams RCC

Roller compacted concrete (RCC) dam construction involves placing by compaction vibratory of concrete in successive layers of 30 to 45 cm thick. The RCC is a permeable material, especially on the surfaces of contact between layers, which are flat or together of potential weakness for the material. This constructive technology generates two areas of transition with RCC body dams it. A with the face of mass vivrate concrete (MVC) and the other with the rock of the footboard. The impermeability of the dam must rely to a thin layer of MVC, of the order of 0, 70m to 1, 30m thick, which forms a waterproof wall in contact with the water of the reservoir. It is complemented by joint water stop placed in the joints between blocks. A crack in the wall or placement joints defects water stop will allow the entrance of water to the body of the dam. If the constructive joints and transition areas were not resolved correctly, they will operate as preferential pathways of spatially connected at all the dam water circulation, so that you emerge in the face of water down a place away from the entry point. Therefore it is difficult to diagnosis and consequently the project. The water through the body of the dam can cause progressive deterioration of concrete due to leaching of calcium hydroxide by what while filtration volumes were eligible, at the time probably undertake the security of the dam. This paper presents a case and the reasons which gave rise to the waterproofing failures, processes observed deterioration and constructive recommendations to prevent the occurrence of such failures.