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Reinforcement percentage to control shrinkage cracking

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Hello all,

ACI 224 s.3.5.2 says “The minimum amount and spacing of reinforcement to be used in structural

floors, roof slabs, and walls for control of temperature and shrinkage cracking is given in ACI 318 or in ACI 350R. The

minimum-reinforcement percentage, which is between 0.18 and 0.20%, does not normally control cracks to within generally

acceptable design limits. To control cracks to a more acceptable level, the percentage requirement needs to exceed

about 0.60%.”.

What is the minimum dimension of a slab we need to go for higher percentage of steel ?. Also is it a good practice to provide this steel in two layers at bottom and top?.

Thanks in advance

Ashraf

 

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