Download ACI 207.5R-11 - Report on Roller-Compacted Mass Concrete by ACI Committee 207 PDF

By ACI Committee 207

Roller-compacted concrete (RCC) is a concrete of no-slump consistency in its unhardened kingdom that's often transported, positioned, and compacte utilizing earth and rockfill development gear. This record contains using RCC in buildings the place measures could 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, houses, layout issues, development, and quality controls are coated.

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Extra info for ACI 207.5R-11 - Report on Roller-Compacted Mass Concrete

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5R-11) that could be detrimental to the quality of an RCC structure. Several are discussed as follows. 1 Foundation quality—Foundations that are suitable for conventional mass concrete are also suitable for RCC with similar properties. 3, the lowcost construction techniques and material properties of RCC make it practical and economical to use a wider base and special design details to accommodate foundations that would otherwise be unsuitable. Examples include Concepcion, Big Haynes, Burton Gorge, Rompepicos, and Buckhorn Dams (Schrader 2006a,b).

The following facing methods have been used for facing RCC structures, and each is discussed in more detail as follows and is summarized in Fig. 6. 1 Natural RCC face—This facing option may be the simplest facing method. RCC is spread to the design line, and the face is the natural slope of the material. It requires no formwork and no special treatments other than perhaps compaction of the unformed joint edge. It may result in an overbuilt section and, depending on the skill of the dozer operator, may result in a significant loss of material during spreading.

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.

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