A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Numerous methods of constructing the upstram and downstream faces of RCC dams have been adopted since the first RCC dam was completed in 1982. One of the major concerns in using conventional vibrated concrete placed simultaneously with RCC, is the difficulty in achieving full compaction of the RCC along its interface with the conventional concrete facing. By adjusting the RCC mix proportions with the addition of a cement-water grout, the RCC can be brought to a more workable consistency such that it can be effectively consolidated using internal vibration methods, as is traditionally used for conventional slump concrete. In 1987, in a trial at the Yantan coffer dam in China, a cement water grout was poured over the spread RCC surface. When it had soaked into the RCC, the mixture could be successfully compacted with poker vibrators along the upstream vertical formwork so as to form a homogeneous impervious facing; the Chinese engineers at that time termed the material 'anomaly concrete'. The method has been used with similar success at the recently completed Cadiangullong dam in Australia and Horseshoe Bend dam in New Zealand, and it is currently in use at the Beni Haroun dam in Algeria. The term now generally used for grout enrichment of RCC to achieve an internally vibratable concrete is GE-RCC or GEVR.
Numerous methods of constructing the upstram and downstream faces of RCC dams have been adopted since the first RCC dam was completed in 1982. One of the major concerns in using conventional vibrated concrete placed simultaneously with RCC, is the difficulty in achieving full compaction of the RCC along its interface with the conventional concrete facing. By adjusting the RCC mix proportions with the addition of a cement-water grout, the RCC can be brought to a more workable consistency such that it can be effectively consolidated using internal vibration methods, as is traditionally used for conventional slump concrete. In 1987, in a trial at the Yantan coffer dam in China, a cement water grout was poured over the spread RCC surface. When it had soaked into the RCC, the mixture could be successfully compacted with poker vibrators along the upstream vertical formwork so as to form a homogeneous impervious facing; the Chinese engineers at that time termed the material 'anomaly concrete'. The method has been used with similar success at the recently completed Cadiangullong dam in Australia and Horseshoe Bend dam in New Zealand, and it is currently in use at the Beni Haroun dam in Algeria. The term now generally used for grout enrichment of RCC to achieve an internally vibratable concrete is GE-RCC or GEVR.
Grout enriched RCC: a history and future
Forbes, B. (author)
International Water Power and Dam Construction ; 51 ; 34-38
1999
4 Seiten, 9 Bilder, 4 Quellen
Article (Journal)
English
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