By ACI Committee 207
Roller-compacted concrete (RCC) is a concrete of no-slump consistency in its unhardened country that's in general transported, put, and compacte utilizing earth and rockfill building gear. This file comprises using RCC in buildings the place measures may be taken to deal with the new release of warmth from hydration of the cementitious fabrics and attendant quantity swap to reduce cracking. fabric mix proportioning, houses, layout concerns, building, and quality controls are lined.
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Additional resources for ACI 207.5R-11 - Report on Roller-Compacted Mass Concrete
When properly designed and installed, this approach has achieved total control of uplift pressures at the upstream face. A conservative approach for this type of system has been to assume 50% uplift reduction at the upstream face, with 67% additional reduction at drilled drains. A significant improvement in stability and reduction of heel stresses can result (Schrader and Rashed 2002). Many RCC dams are constructed with stair-stepped spillways using conventional concrete for the steps. The horizontal lift joint surface between steps is typically not watertight.
An example is a dam design with a proper impervious upstream watertight barrier with face drains. When properly designed and installed, this approach has achieved total control of uplift pressures at the upstream face. A conservative approach for this type of system has been to assume 50% uplift reduction at the upstream face, with 67% additional reduction at drilled drains. A significant improvement in stability and reduction of heel stresses can result (Schrader and Rashed 2002). Many RCC dams are constructed with stair-stepped spillways using conventional concrete for the steps.
If steps are kept at a nominal height on the order of 2 to 3 ft (600 to 900 mm), and they are effective for all except extreme floods, the steps will still pass the flood flow. The steps will simply create a boundary layer of lowvelocity turbulent flow, with the mass of high-velocity water flowing over this protective layer. The owner should be content to accept the occasion duration and frequency of flow where energy is not effectively dissipated by the steps, such as at Buckhorn Dam. Stepped spillways have been constructed with almost no reinforcement and with substantial reinforcement, all with good success.