CONCLUSIONSi. When constructing dams, retaining walls, and other massive concrete structures it is possible to use low-cement (up to 80-100 kg/m 3) stiff concrete mixes placed in thin layers on a large area and compacted by vibrating rollers.2. All thin-walled reinforced-concrete structures should be made of poured selfcompacting concrete mixes delivered by concrete pumps with the use of plasticizing and airentraining additives. For such structures it is necessary to develop special formwork, particularly reinforced-concrete.3. Stiff fine-grained concrete mixes placed and compacted by rotary throwers or vibrating rollers should be used ~or revetting the slopes of earth structures. Rubezhom, No. 4 (1983 One of the greatest bottlenecks determining the rate of construction in the cyclic production-line technology of constructing the earth--rock dam at the Rogun hydrostation is the placement of materials in the dam. LITERATURE CITEDi. Energ. Stroit.The experience of constructing the dam at the Nurek hydrostation showed that the maximum rate of placing loam under the most favorable climatic conditions and efficient organization of the works reached 150,000-200,000 m s per month, and with consideration of seasonal variation and shortage of effective means of compaction the total volumes of placing loam, gravel, and rock were about 8.5 million m 3 per year.
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