Insights from Asphalt Mixtures Testing Section Engineer's Meeting 2015

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Discussed topics include FHWA audit on surface mixtures, regulatory compliance, acceptance procedures, NMAS changes in different mixes, durability issues, and use of recycled materials in asphalt mixtures. Suggestions made for running verification tests, extending sample retention time, and implementing comparison tolerances.

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Section Engineers Meeting 2015 Asphalt Mixtures Testing Section Division of Materials THOMAS CLEMENTS, P.E. February 26, 2015

Outline FHWA Audit NMAS of Surface Mixtures in D1-D3 Asphalt Mixtures Issues Section Engineer s Meeting 2015

FHWA Audit Regulatory Compliance Acceptance Independent Assurance Section Engineer s Meeting 2015

Regulatory Compliance State Personnel need to be running verification tests All NHS projects need IA, not just >$1 mil. Not determining AC% directly Plant Recordation & Back-calculation Ignition Oven Section Engineer s Meeting 2015

Acceptance Retaining Samples Currently required for 5 days This will likely be extended in some way Comparison Tolerances Bonuses Section Engineer s Meeting 2015

NMAS Changes D1-D3 Different NMAS mixes for Western Ky. D4-12 use 0.38in NMAS in all surface mixes D1-3 use 0.50in NMAS polish-resistant mixes Section Engineer s Meeting 2015