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| Vibrodens® |
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The Vibrodens® slip form process produces concrete weight coatings with more consistent and uniform coating thickness, consistent reinforcement placement, a perfect moisture barrier, no damage to corrosion coatings, and compressive strength that meets the most rigid requirements.
The Vibrodens® concrete coating method results in a high quality concrete, whereby a weight coating is produced with the following unique characteristics:
- Concrete density up to 3700 kg/m 3
- Low absorption coefficient of approximately 0.4%
- Exact uniform outer dimensions
- Perfect embedding of reinforcement cages
The high density concrete achieved with the slip form technique provides considerable savings in the consumption of cement and iron ore as well as manpower.
The Vibrodens® Method
Quality concrete requires strictly controlled procedures for mixing and application. The Vibrodens® method has been developed to take advantage of the important effect of vibration to produce a dense concrete coating using the optimal composition of cement and aggregates, including iron ore. The concrete mix is applied to the vertical pipe by a purpose designed slipform process, which allows the coated pipe to be handled immediately after the slipform has been raised along the pipe.
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Density of Concrete
Concrete can be produced with a density anywhere in the range from 2400 kg/m3 to 3700 kg/m3.
Adjustment of the density is achieved by varying the amount of iron ore in the mix.
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Compressive strength
Apart from well graded aggregates, the compressive strength depends mainly on cement and water content. To maintain the necessary cohesiveness of the fresh concrete, the cement content cannot be less than 300 kg/m3 which will produce a compressive strength of 40-45 MPa. The relationship between cement content and compressive strength is illustrated by the graph.
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