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Producing consistent fair-faced exposed concrete only 500m from the Arabian Gulf is a thankless task. So says Buro Happold project manager Gary Cutler, who is ultimately responsible for the supervision of the £20M APICORP headquarters building in Al Khobar, near Dhahran. 'The C40 concrete specified has a water/cement ratio of only 0.35, which means having to use both superplasticisers and retarders,' he adds.