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 nation that's often transported, put, and compacte utilizing earth and rockfill building apparatus. This file contains using RCC in buildings the place measures can be taken to deal with the iteration of warmth from hydration of the cementitious fabrics and attendant quantity swap to reduce cracking. fabric combination proportioning, houses, layout issues, development, and quality controls are coated.

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Individual specimens can be laboratory fabricated with simulated lift joints if the mixture is of a consistency and the aggregate is of a size that permits representative individual samples to be fabricated, but care is needed to realistically correlate laboratory prepared samples to what will actually be achieved in the field. At a number of RCC projects, joint shear tests have been performed on a series of large blocks of the total RCC mixture cut from test placements compacted with full-scale equipment or walk-behind rollers that simulate the energy of a large roller.

The dental mixture should be based on long-term strength and properties, with a much lower interim shortterm strength used for earlier-age quality-control cylinders. Cracking has occurred in RCC above areas where a large amount of relatively strong dental concrete was placed in deep troughs. This is related both to the stiffness or modulus of the hardened concrete, as discussed previously, and to thermal cracking. If a deep placement of dental concrete is required, the mixture should ideally be precooled.

Remedial measures typically include draining hydrostatic pressure from within the crack with a comprehensive series of drilled drain holes. Even with drainage, the mass upstream of the crack may not be effective, and the impact on stability can be serious, if not catastrophic. 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.

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