The Queensland government is facing an uphill battle with union members who want to work less for the same pay.

Protests today came amid a warning the state's productivity was shockingly low and major projects were costing more and more amid attempts to ramp up construction for the Olympics.

Workers who help maintain critical infrastructure from the likes of QBuild, Queensland Health and Transport and Main Roads today marched on parliament demanding better conditions.

"The workers in these three state government industries are advocating across three state government sectors for a 36-hour working week," CFMEU organiser Mitchell Thurlow said.

But time is running out to build the homes, hospitals and stadiums needed by Brisbane 2032.

Acting Premier Jarrod Bleijie said the

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