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

By ACI Committee 207

Roller-compacted concrete (RCC) is a concrete of no-slump consistency in its unhardened country that's more often than not transported, put, and compacte utilizing earth and rockfill building apparatus. This document comprises using RCC in constructions the place measures could be taken to deal with the new release of warmth from hydration of the cementitious fabrics and attendant quantity swap to lessen cracking. fabric combination proportioning, homes, layout issues, development, and quality controls are lined.

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

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The resulting appearance can be good. The freezing-and-thawing resistance of this system is not good, and should only be used in protected areas or in temperate climates. 4 RCC with GERCC against forms—When cement grout is placed in sufficient quantity on the RCC surface along the formed face and the RCC is of sufficient workability, it is possible that the affected area can be consolidated with internal vibrators. This is termed grout-enriched roller- compacted concrete (GERCC). The practice varies from placing grout on the previous lift and covering with fresh RCC, placing the fresh RCC with the grout on top, or both.

Seepage control methods for RCC dams have included: 1) a surface control joint with waterstop; 2) a surface control joint with waterstops and grout taken; 3) membrane placed over the upstream (either a membrane placed with precast concrete ponds or an exposed membrane); and 4) conventional concrete face of jointed slabs placed after the RCC. Transverse contraction joints with surface control and waterstop have been used in numerous RCC dams. Typical details consist of a formed crack inducer in the upstream face with a waterstop in the facing concrete, as shown in Fig.

Its purpose is to connect the conventional facing concrete to anchors placed in the RCC mass, and to control the width of drying shrinkage cracks in the conventional concrete. If the facing mixture has minimal shrinkage and contraction joints, reinforcing has been as minimal as just two longitudinal bars tied to the anchors. Contraction joints with no continuous reinforcement should be placed at all monoliths in the RCC mass. Primarily for aesthetic reasons, intermediate contraction joints are normally placed at approximately 6 to 12 ft (2 to 4 m) spacing, typically with half the reinforcement being continuous through the joint.

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