California · answered by Verika · verified against sources
What slump is allowed for structural concrete on California highway projects?
"Slump flow (min, in) ASTM C1611 20" [1] "The minimum allowable slump flow is 20 inches. The slump flow must not vary by more than 3 inches from the mix design slump flow." [4]
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Verika provides information with citations to help you find and understand the rules that apply to your work. It is not a substitute for professional engineering or legal judgment. Answer generated 2026-08-28; always confirm against the cited source for your project.