Reinforced Concrete Crack Control
Reinforced Concrete Crack Control
(OP)
Hello Everyone!
I am working on a project related to the reinforced concrete water tank crack control recently, the concrete tank is not allowed to have any crack.
Does anybody have related examples about calculation of crack control? (examples that no crack is allowed)
Thank you very much!
Best regards,
Tom
I am working on a project related to the reinforced concrete water tank crack control recently, the concrete tank is not allowed to have any crack.
Does anybody have related examples about calculation of crack control? (examples that no crack is allowed)
Thank you very much!
Best regards,
Tom






RE: Reinforced Concrete Crack Control
RE: Reinforced Concrete Crack Control
contact a material engineer, local batch plant and/or local testing firm for assistance with controlling the mix to help minimize cracking. as far as design and calculation of cracking, i'll have to defer that to someone else since i'm not familiar with a reference that thoroughly discusses this concept.
RE: Reinforced Concrete Crack Control
2. Consider the use of a shrinkage reducing admixture, "SRA". SRA's are available from BASF Admixtures (Master Builders) or WR Grace.
3. Consider installing joints with waterstop and sealant. (Geni or Watson Bowman Acme).
RE: Reinforced Concrete Crack Control
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RE: Reinforced Concrete Crack Control
If there is a quarter inch crack clear through the wall, it will leak. If there is a .001 inch surface crack, it won't leak. And if the cracks have waterstop, they won't leak.
And here's a dirty little secret. Sometimes initially leaky walls stop leaking through clogging or calcification.
RE: Reinforced Concrete Crack Control
RE: Reinforced Concrete Crack Control
In the UK the code for concrete water-retaining structures allows cracks up to 0.2mm. With cracks of this size there may be some initial leakage, but these will self seal through the process of autogenous healing.
If your code/client permits no cracks what so ever then you'll have to use a prestressed concrete solution.
RE: Reinforced Concrete Crack Control
I'll have to read it tomorrow to see what the crack width limits are? I never understood why crack widths are codified because there are a lot of uncertainties when it comes to calculating crack widths. I think a lot of it comes down to an experienced engineer who has been lucky enough to inspect their design's to get a good understanding on what crack widths should be expected.
RE: Reinforced Concrete Crack Control
RE: Reinforced Concrete Crack Control
RE: Reinforced Concrete Crack Control
I'll rephrase something that has been said numerous times in this thread:
"Concrete is going to crack. The best we can do as structural engineers is to plan for the cracks like we know where they're going to occur."