By ACI Committee 207
Roller-compacted concrete (RCC) is a concrete of no-slump consistency in its unhardened kingdom that's quite often transported, positioned, and compacte utilizing earth and rockfill development gear. This document contains using RCC in constructions the place measures may be taken to deal with the iteration of warmth from hydration of the cementitious fabrics and attendant quantity swap to lessen cracking. fabric combination proportioning, houses, layout issues, building, and quality controls are coated.
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Extra info for ACI 207.5R-11 - Report on Roller-Compacted Mass Concrete
The forms are removed and the membrane is left in place. It is more common, and often more practical, to install such a membrane after the RCC has been placed to avoid production impacts of concurrent membrane installation. 6 RCC against slipformed concrete element— Interlocking slipformed stay-in-place elements have been used to create a permanent face (Fig. 5(e)). Slipformed concrete has been used on several projects to provide a highquality concrete facing cast hours ahead of the RCC placement.
The RCC is then compacted with the aggregate. Grout tubes are installed in the aggregate as it is placed. Before raising the reservoir, but after sufficient cooling of the mass, the joint is pressure grouted from the bottom up with expansive grout. A continuous monolithic concrete mass results instead of two masses connected by a thin grout line. 8—Facing design and seepage control The upstream and downstream faces of RCC dams can be constructed by various means (Schrader 1985, 1993). The purpose of facings may be to control the seepage of water through the RCC lift joints, provide a surface that is resistant to freezing and thawing, provide a surface that is durable against spillway flows, provide a means to construct a face 35 steeper than the natural angle of repose of the RCC, and provide an aesthetically pleasing surface.
The horizontal lift joint surface between steps is typically not watertight. Any lift joint seepage that migrates to the down- stream face can normally escape out along the lift joint. In some cases, half-round drains have been installed through the steps to assure that uplift pressure can escape. If the pressure cannot escape (for example, if a continuous slab of concrete is used to create a smooth conventional spillway over the RCC), uplift is trapped on the RCC lift joint behind the slab. The design should address the implications of this potential increased uplift both within the mass and against the spillway slab, or drainage should be provided under the slab.
ACI 207.5R-11 - Report on Roller-Compacted Mass Concrete by ACI Committee 207