Insights from Asphalt Mixtures Testing Section Engineer's Meeting 2015
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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Presentation Transcript
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
NMAS Changes D1-D3 0.38in Mixtures Less Permeable Higher AC% Workability Section Engineer s Meeting 2015
Asphalt Mix Issues Durability Section Engineer s Meeting 2015
Asphalt Mix Issues Durability Recycled Materials Section Engineer s Meeting 2015
Questions Section Engineer s Meeting 2015
