SUPER 800 Enhances Park with Coloured Asphalt
Use in the landscaping sector.
In Leinefelde, where the River Leine has it source, a SUPER 800 carried out a landscaping contract. The small VÖGELE paver was on the scene to surface pathways with yellow asphalt around the Märtensteich lake, the new recreational area in the town centre. At first glance, the material looks like sand, but it doesn't soak when it rains, thus combining outstanding functionality with landscape design.
SUPER 800 gives pathways a decorative finish
A Berlin planning office was commissioned with redesigning the area around the Märtensteich lake in Leinefelde and proposed using yellow asphalt for the pathways. The pleasing, light-coloured appearance of the asphalt not at all evokes an association with roads. On the contrary, it opened up new design possibilities for the park, which quickly won over the city planners of Leinefelde. The surfacing work was carried out by the Nordhausen-based branch of contractor Kemna-Bau. And it was a fortunate coincidence that the company had just taken delivery of a new VÖGELE SUPER 800 and planned its first application. Thanks to the paver’s compact design, it was the ideal candidate for use in tight corners.
New VÖGELE paver keeps the coloured mix clean
The fact that the paver was brand new offered another advantage: material hopper, conveyor tunnel, augers and the AB 200 TV Extending Screed were spick and span and did not have to be cleaned first. When working with coloured mixes, cleanliness is an absolute must and crucial for a perfect final result. From the asphalt mixing plant and the feed vehicles through to the paver and the rollers, all machinery coming into touch with the coloured mix must be clean. Impurities caused by conventional black asphalt might result in dark stripes on the fresh, coloured pathways
Great accuracy when surfacing small areas
Kemna-Bau was fully satisfied with its new small machine. The paving team completed some 1,100m² of pathways and fully complied with the specification in terms of evenness as deviations did not exceed ±2mm. On the contract, the pave width varied between 1.6m and 2.5m. In order to avoid any risk of damage to the park, light wheeled loaders were used to transport the yellow mix from the feed vehicle to the SUPER 800’s 5-ton material hopper.
Paving up to within 5cm of boundaries
On the job, the paving team made frequent use of the small paver’s separately folding hopper sides when it came to smoothly getting round trees or other obstacles in the paver’s way. In some places, paving had to be carried out along a wall. Here, the SUPER 800 impressively demonstrated one of its particular abilities, in fact surfacing right up to within 5cm of the boundary. This special advantage helps reduce manual work to an absolute minimum.
The AB 200 TV Extending Screed provides good pre-compaction
With its AB 200 Extending Screed in TV version (with tamper and vibrators), the small paver achieved excellent compaction values which are out of the ordinary for a machine in this equipment class. As a result, only a few roller passes were required to achieve the final density of the pathways around the Märtensteich lake. Like all VÖGELE screeds, the AB 200 TV, too, comes with electric heating. Electric screed heating ensures uniform heat distribution across the screed plates of both the basic screed and the extending units. These are ideal conditions to obtain a uniform and smooth surface texture.
Current Trend: Coloured Asphalt
A growing number of customers are choosing coloured asphalt for accentuating and enhancing construction projects. Aspects of traffic safety also play a role in this respect. Coloured mixes are used for cycle paths, for instance, when these need to be separated from other traffic areas. In Germany, the colour yellow is particularly popular. In addition to the local recreational park in Leinefelde, yellow pathways can be found on the grounds of the Federal Chancellery in Berlin, the casino in Baden-Baden, in the park of Potsdam’s Sanssouci Palace and in Cologne’s “Rheingarten”, the city’s most popular park located along the banks of the river Rhine.
Important rules when paving coloured asphalt.
There is no question that coloured asphalts have a special charm and are equally popular with city planners and the population alike. Nevertheless, contractors must be aware of certain rules when dealing with coloured mixes. As long as they do, coloured asphalt can be laid just like conventional black asphalt.
Absolute cleanliness is essential
Before using coloured mixes, one point is of utmost importance: cleaning, cleaning, cleaning! Cleanliness is essential for achieving a good final result. And cleanliness runs like a red thread through the whole project, from preparation of the coloured mix in the mixing plant through to placing the mix with the paver and compacting the fresh surfacing with rollers. Every single component coming into touch with the coloured mix must be thoroughly cleaned with solvent. In the following we give an overview of the areas concerned.
Asphalt mixing plant
First of all, the mixing unit requires cleaning. And cleaning takes time, it cannot be done quickly between jobs. The mixing plant’s asphalt storage bin, however, cannot be cleaned. Therefore, only facilities discharging the mix directly into the feed lorry are suited for preparing coloured asphalts.
The lorry’s loading area or the thermal container must be clean to prevent the coloured mix from getting polluted already during transport. If a wheeled loader is used for feeding the paver, the bucket must be clean as well.
The paver’s material hopper, conveyors, augers, screed plates and all other components coming into touch with the coloured mix must be spick and span. In addition, it is recommended to clean the paver by running hot chippings through it and to begin paving in a less exposed area, just in case the mix might nevertheless have been polluted.
It goes without saying that the roller drums and scrapers and, if used, the cutting wheel and edge roller must be clean. The water spray tank should also be emptied and refilled with fresh water to ensure that no residues of rust remain.
Very important: shoes, shovels and other tools must be clean as well.
Never use diesel as a solvent
Caution: Diesel and fuel oil are not suitable as solvents when paving coloured asphalts. Using them for cleaning is not a problem per se, but they do not evaporate. If fresh coloured asphalt mix comes into contact with a surface cleaned with diesel or fuel oil, the residues may pollute the mix. This effect is avoided by using solvents based on renewable raw materials, such as rape oil, orange oil or palm kernel oil. These oils, too, are very effective for cleaning but do not involve the risk of staining the mix, as long as all surfaces cleaned with them have subsequently been treated with steam jet. Please note: only solvents approved by the bitumen manufacturer should be used.
Job Site Details
Surfacing pathways in a recreational area in Leinefelde, Germany
Pave width: between 1.6m and 2.5m
Layer thickness: 4cm
Paving accuracy: ±2mm
Area paved: a total of 1,100m²
Combined base and wearing course of coloured asphalt
SUPER 800 with AB 200 TV Extending Screed