Mobile recycling at prestigious project "aspern Vienna's Urban Lakeside"
VIENNA / ASPERN – A new urban district is to be developed on the approximately 240 hectare site of the former Aspern Airfield. Initial plans to develop one of the largest urban development regions in Europe date as far back as 1992. A new urban district on a scale almost the same as downtown Vienna is to grow here by 2028. The groundbreaking ceremony for the first development phase took place on 3 July 2009.
To begin with a research and development park is to be completed on the site from 2010. A technology centre will be built as an impulse project, covering 8,500 m² gross floor space in the first development phase. The architect's tendering process for this first high-rise building project for the Urban Lakeside has already taken place. A complete urban district – "aspern Vienna's Urban Lakeside" – is then to be developed on the 240 hectare site. The project will see 8,500 housing units for 20,000 residents and 20,000 workplaces created on one of the largest municipal building sites of the Austrian capital. Around 2.3 million square metres of gross floor space will be created by the year 2028. The Underground line U2 will also serve the new district by 2013, with the groundbreaking ceremony for the extension to the urban development zone being held in October. A lively urban district will evolve, with which Vienna will make active use of the opportunities and challenges of the EU enlargement, aiming to set new standards with a "21st century city".
A separate development company was founded for Austria's largest urban development project: "Wien 3420 Aspern Development AG", a subsidiary of the Vienna Business Agency (WWFF) and the Bundesimmobiliengesellschaft (BIG). The consortium ARGE HABAU Hoch- und Tiefbau GmbH/Gebrüder Haider Bauunternehmung GmbH was appointed to demolish the former taxiways and runways. The client's project manager is Roman Koselsky – an employee of Wien 3420 AG and responsible for the technical infrastructure at Vienna's Urban Lakeside.
On-site recycling means maximum benefits
For reasons of environmental protection – and especially due to the huge cost benefits – mobile recycling is a key feature of this prestigious urban development project. Linz-based RUBBLE MASTER launched the principle of mobile on-site recycling with compact, easy to transport crushers back at the beginning of the 1990s and is now the market leader in the compact class. This means that all construction debris is stored and processed on site. As a result there are no unnecessary lorry journeys to and from the job site to remove and dispose of the rubble. This also represents a huge cost benefit, thanks not only to the savings in haulage kilometres and dumping fees but also to the fact that instead of having to buy in new aggregate at high prices, the high-value recycled aggregate can be reused on site. At the Urban Lakeside project, for example, this material is used to make roads and paths.
HABAU Hoch- und Tiefbaugesellschaft m.b.H. – one of Austria's leading construction companies, located in Perg, Upper Austria – has counted on mobile recycling with RUBBLE MASTER Compact Recyclers since 2004. HABAU has been recycling asphalt, concrete, steel reinforced concrete and general rubble to make recycled aggregate at their own locations and also numerous job sites throughout Austria ever since. One of the main reasons behind this is the fact that the high quality of the material processed and produced by the compact but high-performance impact crusher means that the debris can be reused in its entirety. HABAU is also known for its high level of quality awareness.
Compact crusher with top performance
Bernhard Radinger, Waste and Environment Manager at the HABAU Group, is using the RM80 with mobile oversized grain solution once again for this project. He describes the project as follows: "Before work began, extensive evaluation was necessary for the over 70,000 m² site as the Vienna/Aspern Airfield was a main centre in the Second World War and any war relics had to be found. After this work had been completed, the job was to demolish around 15,000 m² of concrete from the former airfield and recycle it. As a partner in the consortium we count on cost-saving on-site recycling.
The fact that we have such a compact RUBBLE MASTER in use here is all down to the excellent experience we have had with similar projects and the RM80. The mobile impact crusher was extremely efficient at the large-scale demolition project at the Vienna/St. Marx slaughterhouse, for example, and we frequently use it for inner city demolition projects. The decision was also based on the machine's outstanding performance with this material and the ability to produce ready-to-use value grain in a single pass with the OS80 mobile oversized grain separator featuring closed-loop refeeding. This saves us a third of the normal workflow and expense."
Around 15,000 m³ of concrete now have to be processed by mid October. A surface area of some 30,000 m² in total has to be broken up - i.e. around 20% of the entire concrete surface of the taxiways at the former airfield in Aspern. A guillotine was used to break the concrete surfaces into segments. The lumps of concrete were lifted out by excavators, pulverised down to a maximum feed size of 50 cm and then put on a pile. The feed material is loaded into the vibro channel of the crusher – which weighs only 23 t – using an excavator and, more recently, also a wheeled loader with a 3.2 m³ bucket. The material is processed quickly in the impact crusher with automatic conveying in line with crusher workload, material and feeding type. The patented OS80 oversize grain separator, which is linked to the main discharge conveyor of the crusher by quick-release levers, grades the material cleanly to 0/32 mm. The oversized material is then returned to the crusher inlet where it is then crushed again. Bernhard Radinger describes the throughput of the compact crusher as "impressive", delivering ready-to-use 0/32 mm aggregate with peaks up to 100 t/h.
Austrian quality standards for recycled building materials
Austria has strict guidelines for recycled materials. Only grade-certified recycled building materials may be reused in construction. HABAU takes this into consideration thoroughly, says Bernhard Radinger: "With the RUBBLE MASTER RM80 – with process technology that itself has CE certification – concrete such as that here from the broken former taxiway can be processed to make cubic "recycled crushed concrete aggregate RB ll 0/32" (source: Austrian Association of Building Material Recycling, Vienna). HABAU's own building material laboratory is responsible for extensive and regular quality supervision. This makes the quality building aggregate suitable for loose upper or lower load-bearing surfaces (as in road building, for example), compacted load-bearing surfaces and farm roads: in this concrete example, for future roads and paths in Vienna's Urban Lakeside.
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Proprietor: RUBBLE MASTER HMH GmbH, Austria.
Published: September 2009