Concrete inspection covers batching, placement, finishing, and curing. MDOT acceptance testing: compressive strength cylinders per AASHTO T 22 at frequency of one set per 50 cubic yards or per day. Slump testing per AASHTO T 119 at point of placement. Air content per AASHTO T 152. Temperature limits: minimum 50°F, maximum 90°F at placement (hot/cold weather provisions apply). Curing: 7 days minimum wet cure or membrane curing compound at specified rate.
References: AASHTO current edition, MI Standard Specifications, FHWA Technical Advisories, and applicable federal regulations (23 CFR). Contractors shall maintain current copies of all referenced standards on the project site.
Source: MDOT Construction Manual, 2024 Edition. Pages 9–10 of 29.