Schedule and interpret pavement friction/skid-resistance testing (ASTM E274 with E501 ribbed or E524 smooth test tires) for a completed paving section.
domain: Asphalt paving contractor / state DOT materials office · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Confirm which test tire the governing spec or investigation requires: ASTM E501 ribbed tire (sensitive to microtexture) versus ASTM E524 smooth tire (sensitive to macrotexture).
Schedule a locked-wheel friction tester (LWFT) run per ASTM E274 procedure on the wetted pavement surface.
Verify the testing unit's current calibration and inter-agency correlation certificate before accepting its results for DOT purposes.
Compare the resulting friction/skid number against the state DOT's minimum friction-number threshold for that route classification.
Flag any section below threshold for surface treatment (e.g., micro-milling, chip seal, or overlay) per the DOT's pavement friction management program.
Known gotchas
Ribbed and smooth test tires measure different surface characteristics; using the wrong tire type for the question being asked produces a misleading result.
State DOTs operate their own locked-wheel testers with periodic inter-agency correlation — an outside contractor's uncalibrated or uncorrelated tester results may not be accepted for official DOT friction determinations.
Friction testing must be done on a wetted surface under controlled speed/load per ASTM E274; dry-surface or off-spec-speed runs are not comparable to the standard.
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