While development of Allu’s new SureMix is aimed at producing Hydraulically Bound Materials (HBMs) for the highway repair market, the company believes it could also have applications in the remediation market.
The first SureMix is currently being put through its paces at Green Solutions’ site in Glasgow, but the machine will be officially unveiled at the Hillhead exhibition, near Buxton, Derbyshire, in June.
“Contractors are starting to use HBMs to prevent the subsidence following utility trench repair, but many are trying to do the mixing at the side of the road and the results are not always as good as they could be,” says Green Solutions managing director Ivan Rowe.
The conventional approach of using Type 1 material for backfilling is less than ideal on two counts - first, much of the excavated material is likely to end up in landfill, and second, if the material is poorly compacted then it will stay that way. According to Rowe, the addition of the hydraulic binder guarantees that the material will consolidate, butthe mix has to be homogenous to achieve the best results and he believes that the SureMix answers this problem.
To develop this new version of the SureMix, which offers higher performance than before, Allu has worked closely with Clayton Engineering. “The previous model used a twin shaft for premixing, whereas the new version has five vertical shafts that make the mixing action more aggressive, enabling the machine to cope with wetter, stickier material than before,” says Allu director David MacLynn.
The result of this re-engineering is a double output of up 140t an hour and, according to Rowe, the mix control and batching capabilities mean that it also offers higher quality assurance of the output material too.
Rowe’s company operates on a zero waste policy and recycles all construction waste that arrives through its gates and the site has a fleet of equipment - some bespoke - to help meet this challenge.
Although Green Solutions only has the SureMix on loan at the moment, Rowe believes it adds to the benefits of HBM by carefully controlling the mixing process, adding the potential to offer quality assurance of the mix.