By ACI Committee 207
Roller-compacted concrete (RCC) is a concrete of no-slump consistency in its unhardened kingdom that's in most cases transported, positioned, and compacte utilizing earth and rockfill building gear. This document comprises using RCC in constructions the place measures can be taken to deal with the new release of warmth from hydration of the cementitious fabrics and attendant quantity switch to reduce cracking. fabric mix proportioning, homes, layout concerns, development, and qc are coated.
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Extra resources for ACI 207.5R-11 - Report on Roller-Compacted Mass Concrete
Regardless of what facing design or seepage control measures are selected, good bond is essential at the lift joint and at the interface between the dam and the foundation. External measures include a number of features discussed herein. • The seepage control measures used for particular facing systems can be used for most of the other facing systems. Drains can be installed between the membrane and RCC; • The use of bedding mixture between the lifts can substantially improve watertightness and bond along horizontal lift joints.
Unlike arch dams, RCC is typically not post- Fig. 4—Contraction joint seal at upstream face. cooled to ensure full contraction before grouting, so the concerns discussed previously for longitudinal joints also apply to these joints. In some instances, if thermal contraction is kept to a minimum, joints in the lower portion of the dam may remain in close contact, even without grouting. The same applies to straight-axis dams in tight V-shaped canyons that can also benefit from three-dimensional effects similar to arch dams.
Because of restraint, ramps on the foundation require more attention than ramps that are within the RCC, above the foundation. 4 Leveling concrete—Some RCC projects have used leveling concrete to cover the foundation and provide a smooth base from which to start RCC, whereas other projects start with RCC directly on the foundation. There are arguments for and against each approach, with each being more or less suitable to different conditions. Leveling concrete simplifies the start of RCC placing and its initial production rate, but it requires considerable time to construct, uses concrete that is more expensive than RCC, and may have different properties than the RCC.