VIDEO: ALLU’s new concrete crushing bucket screens and separates rebar-contaminated demolition rubble

When processing piles of concrete and brick rubble, demolition contractors often run into several large problems — tight sites, messy logistics, and material contaminated with steel. ALLU is addressing these problems with the ALLU Concrete Screening and Crushing Bucket, a new excavator-mounted attachment designed to crush demolition rubble on site. 

The new attachment allows contractors to process demolition materials where they're generated, helping to improve workflow, reduce unnecessary transportation, and support more efficient material recovery across demolition projects. 

"Contractors don't need another machine to manage on a crowded job site; they need a practical way to turn rubble into usable material with the excavator they already have," said Antti Rautamies, R&D project manager at ALLU. "This bucket is built for the real world: fines-heavy material streams, tight spaces, and reinforced concrete that doesn't arrive ‘clean'." 

Designed to go where mobile crushers can't fit 

The ALLU Concrete Bucket is designed for excavators in the 25-45 ton class and crushes demolition rubble such as concrete, bricks, and asphalt (RAP). It targets scenarios where bringing in a separate mobile crusher is inefficient — or simply not possible — helping contractors process material right where it's generated.

The bucket can also be used to increase a mobile crusher's capacity by pre-crushing and feeding with the same attachment at demolition sites.  

Remove rebar and steel without damaging the bucket 

Steel in the feed is one of the fastest ways to ruin productivity. The ALLU Concrete Bucket is designed to handle steel and rebars in the material, helping keep the job moving and reducing "stop-and-clear" time that can kill production on demolition work. 

Different sites and different next steps need different outputs. The bucket features a changeable counter blade setup that supports output sizes of 0-50 mm and 0-100 mm. That means crews can aim for the right balance of fragment size and productivity without changing the whole flow of the job.

The bucket is designed for exceptional production capacity with high fines content, with processing capacity up to 100 t/h and max feed size 300 mm (site conditions and carrier will affect results). 

Structure and wear parts 

ALLU's design focus is simple: build it for daily work and make wear part changes straightforward. The bucket includes a heavy-duty frame structure with a 40 mm cutting edge and 30 mm side cutters, designed to withstand breakout forces of excavators up to 45 tons. 

The bucket utilizes rotating drums equipped with replaceable carbide picks, working together with a counter-blade structure, to continuously crush and screen material. This design promotes a consistent material flow while reducing oversized concrete into reusable aggregate suitable for recycling, backfilling, road construction, and other civil engineering applications.

The rotating drum technology has been developed to withstand demanding demolition environments while providing reliable performance throughout extended operating periods. Replaceable wear components allow routine maintenance to be completed directly at the job site, helping contractors minimize downtime and keep equipment in service without lengthy interruptions. Compatible carriers can also utilize ALLU's Drain Line Eliminator hydraulic technology, further simplifying installation and improving operational efficiency.

Hydraulic requirement: 190 - 315 l/min (50 - 83 gpm) oil flow at 300 bar (4,350 psi); typical operating power ~60-100 kW. Fuel consumption with a 40-ton excavator is noted at ~30 l/h. 

The ALLU Concrete Bucket is still under final testing and will be available in the market in 2026.