Field compaction testing per AASHTO T 310 (nuclear density gauge) or AASHTO T 272 (sand cone). Nuclear gauge calibration per AASHTO T 310 at standard blocks. Density testing frequency: one test per 2,000 square yards per lift for embankment, one per 1,000 SY for subgrade. Acceptance criteria: ≥95% of maximum dry density (T 99) for general fill, ≥100% for subgrade under pavement. Moisture within ±2% of optimum.
References: AASHTO current edition, UT 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: UDOT Materials Testing Manual, 2024 Edition. Pages 5–6 of 25.