By ACI Committee 207
Roller-compacted concrete (RCC) is a concrete of no-slump consistency in its unhardened kingdom that's quite often transported, put, and compacte utilizing earth and rockfill development apparatus. This record 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 reduce cracking. fabric mix proportioning, houses, layout concerns, development, and quality controls are lined.
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Additional resources for ACI 207.5R-11 - Report on Roller-Compacted Mass Concrete
5R-11) Fig. 3—Contraction joint detail. unless the reservoir can be drained or lowered (for example, in a navigation lock outage). When thermal or other analysis indicates that an unacceptable longitudinal crack is possible, a groutable joint can be constructed at the location in question. The joint should be grouted after thermal contraction has caused the joint to open significantly, but grouting may be needed earlier due to the schedule for raising the reservoir. In this case, a regroutable joint should be designed if possible, or the joint and grout should be designed so that it will continually expand over time as the joint tends to open more.
5—Temperature studies and control RCC dams are a series of one or more unreinforced massive concrete monoliths. The design of the structure should include provisions for dealing with inherent temperature changes and resulting volume changes. 5R-11) changes lead to cracking of the structure. The principal concerns for cracking in RCC and other gravity dams are structural stability, appearance, durability, and leakage control. Although not a factor in the stability of a structure, uncontrolled leakage through transverse cracks can result in an undesirable loss of water, create operational or maintenance problems, and be visually undesirable.
In this case, the RCC can deform and accommodate abrupt irregularities in the foundation with little or no induced stress. 5R-11) or features necessitated by construction means and methods. It is preferable to locate encased outlets or diversions so that they do not interfere with the general progress of RCC placement and do not initiate cracking within the dam itself. Embedded outlets placed in an excavated trench that is backfilled with dental concrete is ideal. A second preferred location is at the abutment contact, particularly if they are steep.