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| As part of the joint collaborative venture between Hampshire County Council, Amey and Allasso Recycling a programme of haunching utilising Hydraulically Bound Material was undertaken. The material selected was a CBGM incorporating Pulverised Fly Ash (PFA) with the source aggregate being road planings containing coal tar. |
Rapid plant in action
Asphalt Truck
| Sites were investigated using coring and DCP methods to make an assessment of the existing construction and subgrade strength. An established ‘mix matrix’ was utilised for the CBGM mix designs. The programme consisted of carriageways ranging from ‘A’ Roads through to ‘U’ Roads, demonstrating the versatility of the process.The operation was completed from our base depot in Hampshire, utilising existing stockpiles of material from other Hampshire sites as well as the site arising’s from the haunching sites. | The sites suffered from poor edge construction, with the upper bound layers often containing coal tar bound material, which would increase the costs of conventional construction significantly.The bound material containing coal tar was planed to depth and returned to the processing depot, the remaining inert material was planed and stockpiled separately. |
Haunch in progress
HBM Complete
| The CBGM consisted of 0/20mm aggregate product, mixed according to mix design and returned to site to be paver laid by Allasso gangs. This process enabled the same vehicle bringing in the site arising’s to return to site with prepared HBM, reducing vehicle movements. The majority of the sites were surfaced each day to allow full opening of the carriageway to traffic each night. This method demonstrated the early life bearing capacity of the material. Quality was monitored by an onsite technician to ensure compliance with the mix design. |
Process Overview |
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Key Benefits |
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