The science bit

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Whatley Quarry (large version)

The asphalt (tarmac) for the Weymouth Relief Road is being produced at Hanson’s Whatley quarry near Frome in Somerset.

It is made up of three different materials, AC32HDMbase, AC20HDMbinder and Tuffgrip.

The AC32 and the AC20 are the lower layers, which are produced using limestone aggregate from Whatley quarry and the bitumen (tar) is supplied by Petroplus from their Coryton refinery in Essex.

Tuffgrip is one of Hanson’s branded products, it is a thin surfacing system that is produced using gritstone aggregate from Hanson’s Brayford quarry in North Devon, the bitumen is a polymer modified bitumen which is also supplied by Petroplus from their Coryton refinery.

The gritstone from Devon has better properties to improve skid resistance.

And if that makes no sense, at least you can appreciate the scale of the operation by looking at the aerial photo above.

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