Completed in early 1990, it was the first in the world single center arch-gravity dam made of roller-compacted concrete fully relying on three-dimensional arch action for stability. The 70-m high dam has a vertical upstream face and a stepped downstream face at a slope of 0.5:1 (H:V). It has a constant extrados radius of 135 m and a crest length of 268 m. The non-overflow crest is 5 m wide. The dam was built of 0.25 m thick roller-compacted concrete layers with induced joints at 10 m spacing and de-bounding every 4th layer. The RCC of approximately 200,000 m3 (260,000 cu yd) was placed in October and November 1988 and between May and November 1989. The induced joints were grouted in winter, between July and November 1993. The reservoir was filled to capacity in 1992.
Composition of the high-paste RCC
Portland Cement
Fly Ash
Water
Coarse Aggregate
Fine Aggregate
kg/m3
kg/m3
kg/m3
kg/m3
kg/m3
58
136
100
1510
625
The RCC mix properties were:
RCC density: 2,400 kg/m3
Average 1-year RCC compressive strength: 35 MPa (5,076 psi)
