SPECIAL APPLICATIONS
Roller Compacted Concrete
Roller Compacted Concrete (RCC) is a common alternative to asphalt and used extensively. RCC consists of uncrushed and/or crushed aggregate, hydraulic binders and sometimes concrete additives. It is mixed in a concrete mixing plant on or near the job site. The mix is transported by conventional feed vehicles and transferred to a paver, which places the material in layers up to 25cm thick. Finally, the concrete layer is compacted with rollers.
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RCC is stiff enough to be compacted with vibratory rollers. However, the number of roller passes must be kept to a minimum in order to achieve the best possible stability, evenness and surface structure. This is guaranteed by the VOGELE High Compaction Screed in TP2 version. In addition to a tamper, the screed comes with 2 pressure bars operated by pulsed-flow hydraulics. VOGELE is the only manufacturer worldwide to offer this pulsed-flow hydraulics technology. A pulse generator inside the system generates high-frequency pressure pulses. These ensure that the pressure bars are in permanent contact with the mix, forcing the mix down until it cannot be compacted any more. This unique technology produces the highest compaction values that can be achieved by a road paver. Plus, roller passes are reduced to an absolute minimum. Often, just static roller passes are sufficient.
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In order to achieve perfect results when laying RCC, a number of factors must be taken into consideration - referring to the properties of the concrete on the one hand, and to settings of the compacting systems inside the screed on the other.
The moisture content of the concrete is crucial for achieving maximum precompaction values. If the material contains too little water, optimal compaction of the concrete is not possible. If it contains too much water, the screed will risk sinking into the mix. Therefore, in order to determine the optimal moisture content, a test field should always be paved on the job site.
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The pressue bars are located in the rear area of Vogele High Compaction Screed. In this location, the highest possible compacting intensity is achieved, as the mix is prevented from yielding to the front. Nor can it yield to the sides where it is confined by bevel irons.
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At present AP Pavers are operating 3 Vogele 1800-3i TP2's and 1 Vogele 1800-2 TP1 high compaction screeds, all are equipped with everything needed to lay RCC and we find the Vogele does an exceptional job.
Please do not hesitiate to contact us with all enquiries for both the SprayJet and laying RCC.
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