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Nebraska DOT Go Big Red….. Going Green ! ROBERT C. REA, P.E. MATERIALS AND RESEARCH DIVISION [email protected] AASHTO COMMITTEE ON CONSTRUCTION AUGUST 10-13, 2020
Nebraska DOTGo Big Red….. Going Green !ROBERT C. REA, P.E.MATERIALS AND RESEARCH [email protected]
AASHTO COMMITTEE ON CONSTRUCTIONAUGUST 10-13, 2020
How did that happen ?1. History2. How RAP Incentive Program works3. Post Consumer Recycle Content Label
Driving factors1. 2008 POLYMER AND BINDER
SHORTAGE NATIONWIDE
2. WE HAD MILLINGS (RAP) STOCKPILES ALL OVER THE STATE
Timeline
Polymer and Binder
Shortages Globally.
Prices Tripled
2008 2020Focus Design Ideology on
RAP Optimization
While maintaining overall mix quality and much softer
binder grades
CreatedSPRSPSSPHSRMSLX
PG64-22 58-34
Timeline
Millings Stockpiles
scattered all around the
state
2008 2020As many as
75 Large Stockpiles
Referred to as
‘Mountains of Millings’
‘Couldn’t store any
more, give it away.’
0
5
10
15
20
25
30
2007 2009
6.9%RAP
27.3%RAP
Average RAP Content
Binder Savings IncentiveRAP Source % ReimbursementRAP coming from an ON-project source1 15State supplied RAP coming from an OFF-project source2 35Contractor supplied RAP3 50
% Incentive To Contractor To NDOT
85 %65 %50 %
15 %35 %50 %
1 -2 -3 -
How Does it Work ?
Reclaimed Asphalt PavementMillings from the roadway
5 % Binder (Oil) 95 % Aggregate
RAP
Approx 5 % Binder (Oil) $30 to 35/ton
95 % Aggregate $15 to 20/ton____________________
$50/ton material value
1 Ton of RAP
Example from Contract Perspective
• BINDER $650/TON-PAID AS A SEPARATE ITEM -MIX DESIGN BINDER APPROX = 5%-RAP FROM PROJECT = APPROX 5% BINDER
• AGGREGATES $15/TON
• PRODUCTION COSTS $25/TON
Cost Components
Cost Components
Cost Components
Cost Components
05
1015202530354045
2007 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019
Average RAP Contents
05
101520253035404550
2007 2009 2010 2011 2012 2013 2014 2015 2016
Annual Savings from RAP Optimization
Timeline
9.2 Million Tons of
Aggregate Recycled
2008 2020498,000 Tons of Asphalt binder equivalent to Refining 93
Million Barrels of Raw Crude
That is 124 loads of
these AfraMaxClass Oil
Freight Ships
Total Savings of $408 M in binder and aggregate
Averaging $34 Million in savings Annually
Post Consumer Content Label
• BEGAN USING IN 2014
• IN PLAN SETS AND ANNUAL REPORT
• SHOW NDOT’S COMMITMENT TO RECYCLING AND ENVIRONMENTAL STEWARDSHIP
• BASED ON QUANTITIES OF ASPHALT AND CONCRETE AND CALCULATED RECYCLED CONTENTS
Post Consumer Content Label
Post Consumer Content Label
Post Consumer Content Label
NDOTAnnualReport
Thank You !
Questions ?
