New Hampshire · answered by Verika · verified against sources
What slump is allowed for structural concrete on New Hampshire highway projects?
Slump for structural concrete on New Hampshire highway projects must be kept within 1–3" for footings and mass concrete, 2–4" for columns/pedestals/walls ≤18" thick, 2–3" for decks/sidewalks/walls >18" thick, 6–8" for tremie concrete, and ≤8" max for concrete with high-range water reducer [1]. For slope paving, slump must be 2–3" [2]. For concrete anchors/barriers, slump must be closely controlled between 2–3" [6].
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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.