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A joint-free 200mm thick, high-strength concrete slab measuring 50m by 30m has been cast at Longannet power station in Fife. In what is claimed to be a UK first, Blue Circle supplied a shrinkage-compensated cement to local readymix concrete supplier Hanson/ Pioneer, which produced the P35 mix required. Blue Circle says the blended cement, dubbed Rockfast C-SCC, produces 1% expansion in the concrete after 7 days wet curing. This is restrained by the mesh reinforcement, eliminating the need for movement joints.

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