On-site recycling reduces costs
ABU DHABI. Mobile recycling is also gaining in importance in the United Arab Emirates. Due to the dimension of the construction projects – as in Abu Dhabi City, for example – the cost benefit from recycling waste construction materials on site is a clear argument in favour of the highly efficient machines from the market leader in compact mobile recycling from Austria.
Developed at the beginning of the 1990s, the RUBBLE MASTER Compact Recyclers are high-performance, compact crushers more than thousand of which are now in operation around the globe. Thanks to their versatility they can process asphalt, concrete, general construction debris and mineral production waste such as ready mixed concrete and bricks just as cost-effectively as natural stone. The impact crushers can even handle steel in the feed material with no trouble at all.
Thanks to their compact dimensions and a transport weight of between 12 and 28 tonnes, the innovative crushers and screens can be transported quickly to the respective job site, where they are ready for operation within 20 minutes. Radio remote control handles crushing and manoeuvring operations as they move around the job site. The remote control unit ensures that the machine can be operated reliably and safely by one person alone from the digger. The main advantage here is that the machine needs only one trip to the job site where it can then process any mineral construction waste. This saves the contractor enormous transport costs that would otherwise be incurred by all the journeys required to transport tonnes of material.
Due to the high quality of the cubic final grain produced by the RUBBLE MASTER impact crushers, the material itself can be reused on site and is ideal for backfilling, site roads and sub-bases for parking spaces, for example. This means the customer can save further costs by not having to buy in new material. Instead, high-quality recycled building materials can be produced and put to good use at the site in question.
RM80 at a construction project at the Abu Dhabi Autodrome
A prime example of this approach is the first RUBBLE MASTER RM80 to be shipped to the Emirates shortly before the BIG5 Show 2008. The first job took the compact crusher to Abu Dhabi City for a major project directly on the highway, opposite the Abu Dhabi Autodrome. This large-scale operation includes the development of a residential park for the Abu Dhabi Autodrome directly on the coastline of the Persian Gulf. The circuit on the island Yas, scheduled to be completed by the end of 2008, will bring Formula 1 racing to the Emirates' largest sheikdom.
The job was a hire contract for ALDAR Laing O’Rourke Construction LLC, one of the leading construction groups in the UAE. ALDAR is known for its innovative site logistics: all materials are carefully separated on site and then reused wherever possible – not only residual mineral masses but also wood and metal. Foreign matter such as plastic is removed and taken to the waste tip. Brett Gay, Senior Logistics Manager at ALDAR, explaining why the decision fell in favour of the RUBBLE MASTER Compact Recyclers: "RUBBLE MASTER fits in ideally with our extensive recycling concept.
This project, like so many others, called for a cost-effective solution to recycle the residual ready mixed concrete left over from the large amounts required on site. The mobile RM80 with crawler gear now enables us for the first time to crush the hardened masses of concrete from the mixer and damaged cast concrete on site. The compact impact crusher achieves an average throughput of 130 t/h with a final grain size of 0/50 mm. We reuse this material to stabilise the site access roads."
Defined aggregate in a single pass
Brett Gay was particularly impressed by the patented RUBBLE MASTER solution for a defined aggregate size in a single pass: "With the OS80 mobile oversize grain separator which is simply mounted on the discharge belt of the crusher, the broken concrete can be screened off to a particular grain size – in our case 0/25 mm. Any oversized grain is transported via the refeeding belt back to the feed hopper to be crushed again. This means we can produce 100 t/h of 0/25 crushed concrete which we then use for backfilling. The crusher will be on site for 8 days a month on average, processing some 10,000 tonnes of residual concrete. We have now had the RUBBLE MASTER system in operation for 2 weeks and can already see how much money we can save by not having to transport material to and from the job site!"
Successful concepts of this kind catch on quickly. No surprise then that the mobile RUBBLE MASTER Compact Recyclers were in great demand at the BIG5 Show in Dubai. A further two RM80s are to be shipped to the Middle East in January 2009: one destined for Bahrain, to a construction group with over 30 years of experience, and the other once again to a big player in the Emirates.
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Published: January 2009