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Minimum concrete strength to ACI 318M

Minimum concrete strength to ACI 318M

Minimum concrete strength to ACI 318M

(OP)
We recently had a job where some concrete returned quite low strengths. A check showed the members were adequate for strength but are there any other provisions that might limit the minimum strength. My check found -

Clause 1.1.1 specifies a minimum strength of 17MPa

Chapter 4 contains durability provisions which apply in certain circumstances, viz;
Clause 4.2 Freezing and thawing
Clause 4.2.2 Special exposure conditions including salt
Clause 4.3 Sulphate exposure
Clause 4.4 Chloride ion content

Clause 7.7 specifies concrete cover, unrelated to concrete quality except;
Clause 7.7.5 - Corrosive environments contains a general statement that in corrosive environments concrete quality and cover should be appropriate to the environment.

Conclusion: unless there is a corrosive environment or freeze-thaw, ACI 318 contains no specific provisions for minimum concrete strength other than Clause 1.1.1

Is this conclusion correct or are there any other clauses we should refer to?

RE: Minimum concrete strength to ACI 318M

I don't have 318 in front of me but I think you may be right that there isn't really anything else in there that prescribes minimum concrete strength.

There are provisions limiting maximum f'c though.

RE: Minimum concrete strength to ACI 318M

ACI 318-05, 1.1) f'c shall not be less than 2500 psi.

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