By ACI Committee 207
Roller-compacted concrete (RCC) is a concrete of no-slump consistency in its unhardened kingdom that's generally transported, put, and compacte utilizing earth and rockfill building apparatus. This file comprises using RCC in buildings the place measures could be taken to deal with the new release of warmth from hydration of the cementitious fabrics and attendant quantity switch to reduce cracking. fabric blend proportioning, houses, layout concerns, development, and quality controls are coated.
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Extra resources for ACI 207.5R-11 - Report on Roller-Compacted Mass Concrete
RCC dams experiencing high thermal stresses may also exhibit unseen cracking parallel to the axis of the dam. This type of cracking has occurred in both conventional and RCC dams. It can have serious structural and stability implications. The dam will probably be safe and stable for normal load conditions, especially if the crack is closed and does not contain water. Analyses of different dams have shown that this type of cracking can jeopardize sliding and overturning stability if it fills with water at the reservoir head.
The freezing-and-thawing resistance of this system is not good, and should only be used in protected areas or temperate climates. 5 RCC against forms with membrane—The previous facing systems can be further modified to include a PVC membrane. Membranes have been installed on the vertical formwork surfaces against which RCC is placed. 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.
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. Leakage is extremely difficult to control. Thermal stresses and associated volume changes typically result in transverse cracking of the structure. RCC dams experiencing high thermal stresses may also exhibit unseen cracking parallel to the axis of the dam. This type of cracking has occurred in both conventional and RCC dams.
ACI 207.5R-11 - Report on Roller-Compacted Mass Concrete by ACI Committee 207