ABSTRACT
Phosphorous slag and tuff (PT) had been successfully used instead of flyash for the RCC and conventional concrete of the Dachaoshan gravity dam. A milling plant with an annual yield of 100,000 tons was built as site. Up to June 2000, 109,300 tons of PT had been used in the 1.198 × 106m3 concrete, among which 0.64 × 106m3 was RCC. Quality tests showed that the PT blend had stable chemical composition and met the design requirements in physical properties. And the conventional concrete and RCC also met well the design requirements in compressive strength, shearing strength, seepage and freezing resistance etc. The use of PT blend solved one of the key problems in the construction of the RCC dam over 100 m in height. The amount of cement was minimized, cost was kept low and progress was facilitated without compromising the overall quality. So a precedent with good social and economical benefits was set for the ensuing large-scale hydropower projects.
