Workers on the terminal five building site at Heathrow are staging a three-day walkout in their continuing row over pay.
Scaffolders, labourers and others went on strike today after a new offer to increase bonus pay by 80p an hour was rejected.
The workers are demanding a £1-an-hour rise in bonuses and have already taken part in strikes in December and earlier this month.
Employers Laing O’Rourke had previously offered an extra 67p per hour.
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Phil Davies, of the GMB union, said: “Laing O’Rourke have misjudged the mood of the workforce right from the start of this dispute.”
Heathrow Airport maintains that industrial action has not disrupted building work.
