ACI 318 indicates a minimum reinforcement of 0.0018 to control shrinkage and temperature effects. In case of an isolated footing with a depth greater than 1 m, I have placed 0.0026 only in the bottom face to fulfill the bending design. I am fulfilling ACI 318 but what is the minimum reinforcement to control shrinkage and temperature effects in the top face?
The shrinkage and temperature reinforcement ratio is the same for top and bottom face.
Thanks
For the minimum reinforcement in the foundations, the ACI values can be used: 0.0018, but it is recommended to distribute that amount on both sides of the foundation, for example 50% / 50%, although I personally recommend placing more proportion in the area of traction (2/3 of traction and 1/3 of the other side), which is on both sides is more important in the case of thick slabs like the ones you mention.
Thesis MINIMUM STEEL REINFORCEMENT FOR CONTROL OF CRACKING DUE TO S...
https://ascconline.org/Portals/0/Technical-Article-July_WebSC.pdf?ver=2016-07-12-141059-753
http://www.engineersdaily.com/2011/04/shrinkage-and-temperature-reinforcement.html
https://www.facebook.com/Civilengineering5557/photos/temperature-and-shrinkage-reinforcement-for-footing-and-slabsconcrete-shrinks-as/1407257302743406/
https://www.degruyter.com/downloadpdf/j/ace.2019.65.issue-1/ace-2019-0008/ace-2019-0008.xml
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