Roller compacted concrete

Roller compacted concrete - Roller Compacted Concrete...

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Roller Compacted Concrete P.K. Mehta and P.J.M. Monteiro, Concrete: Microstructure, Properties, and Materials Roller Compacted Concrete
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Roller Compacted Concrete P.K. Mehta and P.J.M. Monteiro, Concrete: Microstructure, Properties, and Materials Concept and significance ± The development of Roller Compacted Concrete (RCC) caused a major shift in the construction practice of mass concrete dams and locks. The traditional method of placing, compacting, and consolidating mass concrete is at best a slow process. Improvements in earth-moving equipment made the construction of earth and rock-filled dams speedier and, therefore, more cost-effective.
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Roller Compacted Concrete P.K. Mehta and P.J.M. Monteiro, Concrete: Microstructure, Properties, and Materials Early Developments ± The first successful application of RCC technology was demonstrated in 1974. The repair of the collapsed intake tunnel of Tarbela Dam proved that the material had more than adequate strength and durability. The maximum placement of 18,000 m3 of RCC in one day, which is still the world’s record, was a clear evidence of the potential of this new construction method.
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Roller Compacted Concrete P.K. Mehta and P.J.M. Monteiro, Concrete: Microstructure, Properties, and Materials Definition ± ACI 207.5R-89 defines roller compacted concrete (RCC) as concrete compacted by roller compaction. The concrete mixture in its unhardened state must support a roller while being compacted. ± Thus RCC differs from conventional concrete principally in its consistency requirement. For effective consolidation, the concrete mixture must be dry enough to prevent sinking of the vibratory roller equipment but wet enough to permit adequate distribution of the binder mortar in concrete during the mixing and vibratory compaction operations
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Roller Compacted Concrete P.K. Mehta and P.J.M. Monteiro, Concrete: Microstructure, Properties, and Materials Advantages ± By 1997, 150 projects using RCC, including 46 new dams, were completed in the United States. ± The U.S. Army Corps of Engineers list the following advantages of using RCC: ± Costs: Depending on the complexity of the structure, RCC costs 25 to 50% less than conventional concrete.
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Roller Compacted Concrete P.K. Mehta and P.J.M. Monteiro, Concrete: Microstructure, Properties, and Materials Advantages ± Rapid Construction: For large projects, RCC dams can be finished 1 to 2 years earlier compared to regular mass concrete dams. ± Spillways: Compared to embankment dams which normally require that spillways be constructed in an abutment, RCC dams offer the attractive and cost-effective alternative of constructing the spillway in the main structure of the dam.
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Roller Compacted Concrete P.K. Mehta and P.J.M. Monteiro, Concrete: Microstructure, Properties, and Materials Japanese Experience ± Cement consumption is lower because much leaner concrete mixtures can be used. ± Formwork costs are lower because of the layer
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Roller compacted concrete - Roller Compacted Concrete...

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