The concrete slump test what it actually tells you
Slump = workability. It tells you how much water is in the mix relative to the design. NOT whether the concrete is strong.
High slump = too much water = lower compressive strength = cracked structure in 3 years.
Spec says 60–160mm slump? That range isn't a suggestion. It's a strength guarantee.
Rejecting a load with 180mm slump is not being difficult. It's doing your job.
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