Building the pool and concrete deck, temperature variation is 60F-90F. Do I need deck expansion joint?

The pool is being built in Costa Rica with minimum temperature variation, lets say between 60F to 90F. The contractor connected the deck with the wall of the pool, and I am concerned if such approach, without the copping brick-to-deck expansion joint will not cause any problems. Concrete deck is about 10 Ft wide, 40 ft long.
Thank you for your answer.

Answers:
Put in an expansion joint. Why take the risk the deck could damage the pool wall.

Other answers:
If you don't put in expansion joints, you ought to be making cuts, at a minimum every 6-8 feet. That's one big slab you're talking about the overall expansion gets larger, the larger the slab.
If you don't put in expansion joints, you ought to be making cuts, at a minimum every 6-8 feet. That's one big slab you're talking about the overall expansion gets larger, the larger the slab.
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