By ACI Committee 207
Roller-compacted concrete (RCC) is a concrete of no-slump consistency in its unhardened country that's ordinarily transported, put, and compacte utilizing earth and rockfill building gear. This file contains using RCC in buildings the place measures will be taken to deal with the iteration of warmth from hydration of the cementitious fabrics and attendant quantity swap to reduce cracking. fabric blend proportioning, homes, layout issues, building, and qc are lined.
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Extra info for ACI 207.5R-11 - Report on Roller-Compacted Mass Concrete
S. Bureau of Reclamation (2005), USACE (1997), Tatro and Schrader (1985, 1992), and Ditchey and Schrader (1988). Many factors can be evaluated when attempting to predict the degree of cracking a structure may experience. Simple analyses that combine very generalized conditions yield very general results. Complex analyses combine very specific determination of conditions to yield more exacting results. As a minimum, designers should consider the daily and monthly ambient temperature fluctuations, the conditions in aggregate production and RCC mixing that lead to an RCC placing temperature, a realistic placing schedule, and realistic material properties.
The aforementioned systems use a variety of measures to control potential seepage through the RCC lifts. Internal measures include mixture proportions that contain an abundance of paste so that bonding along the lift surface is improved. 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.
Typical details consist of a formed crack inducer in the upstream face with a waterstop in the facing concrete, as shown in Fig. 4, followed by crack inducement in the RCC lift by one of the methods described previously. For water-retaining structures, induced contraction joints are recommended. Thermal and foundation related cracks at Upper Stillwater Dam caused significant leakage that required postconstruction grouting and subsequent repairs. Arch dams require contact across transverse contraction joints for the structure to function in the three-dimensional manner that is has been designed.