Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Pull the specific state DOT's current spec section governing RAP use, since caps differ by mix layer (surface vs. intermediate vs. base).
Determine whether the intended RAP percentage exceeds the threshold that triggers a required blending equation or a softer virgin binder grade.
Verify RAP stockpile fractionation, gradation, and binder-content testing requirements the spec imposes before the material can be batched.
Calculate the RAP-contributed binder content and virgin binder needed to hit the target total binder content in the JMF.
Document the RAP source, testing results, and blending calculations in the mix design submittal for DOT approval.
Known gotchas
RAP caps vary widely by state and by layer (e.g., some agencies cap surface-course RAP around 15% while allowing 25–30%+ in base/intermediate layers) — a percentage that's fine in one state's spec may be non-compliant elsewhere.
Exceeding a state's RAP threshold typically triggers a mandatory blending-equation binder-grade adjustment that crews sometimes skip, producing an out-of-spec binder grade.
NAPA-reported national averages (around 21% RAP use) are not a substitute for the specific contract's spec limit.
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