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Heat blanket strengthens T5 concrete

MATERIALS

HEATHROW Terminal 5 contractor Laing O'Rourke is using electric blankets to help cure post-tensioned concrete decks during the construction of a car park at the site.

Rotherham-based specialist Inditherm has supplied 24 heated blankets to warm the 150 mm thick post-tensioned decks on the project up to 40 deg C in an effort to increase the concrete's compressive strength development rate.

The blankets incorporate a carbonbased conductive polymer that runs on voltages as low as 6 V and can warm the concrete to 120 deg C.The blankets can be rolled up and reused on other concrete pours.

The technology, recently awarded a European Union development grant, can help shave cash from a project budget by speeding up completion and reducing the risk of associated delays, according to Inditherm's chief executive, Richard Harpum.