PCC: Concrete Placed by the Paver
For the construction of higly trafficked roads.
Concrete lasts longer, concrete is stronger, but concrete often exceeds the budget - these three factors were typical of concrete paving in road construction so far. The last statement referring to the budget, however, needs no longer be true. The VÖGELE High Compaction Screed in TVP2 version with tamper, vibrators and 2 pressure bars allows Paver Compacted Concrete (PCC) to be paved easier and more economically. RoadNews has a report for you.
No asphalt pavement can withstand this: high point loads make containers and heavy goods vehicles leave traces in the pavement. The solution is Paver Compacted Concrete, in short PCC.
A construction material which so far, however, was not easy to pave. It requires know-how and experience in order to present acceptable results. VÖGELE clients Schneider Bau and Kern GmbH, 2 Germany-based companies, have entered a close co-operation in favour of PCC. Together they build concrete surfaces and roads.
German contractor Altmarkbau, too, a member of Matthäi Bauunternehmen GmbH & Co KG and convinced supporter of PCC, has paved roads and storage areas on the premises of Germany’s largest cellulose factory at Stendal – and saved both paving material and time. Nowadays PCC paving has eached the stage of perfection. The secret is in the screed – the screed is the crucial tool when it comes to surface quality and density. For PCC paving VÖGELE developed their SB 250 B Fixed-Width Screed in TPV2 version for high compaction of concrete. The T stands for tamper, the V for vibrators and the P for pressure bars. Three features for perfect PCC results.
VÖGELE SB 250 B Fixed-Width Concrete Screed in TVP2 Version for High Compaction
Set-up of Compacting Systems
Tamper Stroke: 9mm
Tamper Speed: 1800 revs/min.
Pressure Bars: up to 120 bar
Vibrators: 2600 revs/min.
Pave Speed: 1m/min. (approx.)
Answers to Questions About PCC Paving
- PCC is concrete laid by the paver. PCC stands for “Paver Compacted Concrete”.
- When comparing PCC and asphalt, the concrete pavement is superior in terms of stability, longer in-service life and resistance to deformation due to heat. On the other hand, road repairs are easier to carry out for asphalt pavements. When using VÖGELE road pavers, costs for paving PCC or asphalt are almost identical.
- PCC can be laid by the paver similar to laying asphalt, the pave speed however is slower (about 1m/min.). When paving PCC with a VÖGELE SB 250 B Fixed-Width Concrete Screed in TVP2 version, there is no need for extra compaction by rolling.
- PCC strips are laid “fresh to fresh” (new strip paved adjacent to the previously laid, still fresh one) or “fresh to cured”, but never “fresh to semi-cured”.
- A PCC pavement can carry many times the load of an asphalt pavement. This is why PCC is perfectly suited to use for heavily loaded surfaces such as storage areas for containers.
- In order to ensure impeccable hardening of the concrete, the pavement must undergo proper treatment after paving and be sprayed with water.
- VÖGELE NIVELTRONIC Grade and Slope Control produces surfaces of absolute evenness, no water ponding on the pavement. Level sensors and slope sensor help achieve optimal results.
- The use of VÖGELE pavers is efficient also for small contracts (generally carried out in the conventional way with slipform and poured concrete).
- Pavers are fed with PCC by feed lorries (same way as with asphalt).
- After PCC paving, the paver can easily be cleaned by highpressure jet of water. After a change of screeds the machine is immediately ready for asphalt paving.