Asphalt Pavement Magazine - May/June 2018 - 25

A Green Answer for Higher Recycling

Good charging of the hopper shows off the
fine mix.

in the RAP is a little less flexible
than virgin asphalt cement," he
said. As agencies add more than the
national average of 20.5 percent RAP
to mixtures, they're adding more of
the stiffer, oxidized material.
At this time, Willis said, even
the National Cooperative Highway
Research Program (NCHRP) is
looking at recycling agents, such as
rejuvenators, for mixes, to restore
softness and flexibility to the
recovered binder from RAP. "The
rejuvenator or recycling agent does
not 'unage' the binder, but softens
it, similar to what an anti-aging skin
cream does. The sun takes the oil
away from skin; the cream adds it
back. With RAP, the sun takes away
the elements that keep it young;
these chemicals restore the youth."
Readers can check out NCHRP 9:58
for updates.
Agencies are catching on. Willis
pointed to the NAPA/FHWA 2016
Construction Season Survey on
Recycled Materials and WMA.
Producers from 11 states reported
using recycling agents in RAP
mixtures, and eight states reported
using recycling agents in RAS
mixtures. Nationally, tons produced
using recycling agents is estimated
at 7 percent.

Project Lessons

The roller operator on the County Route 61 project has 35 years of experience and reported an easier
time of rolling out marks from cross-traffic when working with the Delta S-dosed mat versus the
control mat.

county forces work with a milling
contractor, Bituminous Roadways,"
Elsner explained. "The county does
the hauling with the contractor
providing the full-width mill and an
operator."
After the milling and sweeping
operation, a Hennepin County
asphalt distributor on a truck
sprayed a tack coat. Commercial
Asphalt Company of Maple Grove,
Minn., manufactured both asphalt

mixtures for the Route 61 job at
its 700 TPH Gencor drum mix
plant, which was about 15 minutes
from the project site. The plant
was installed in 1999 and averages
800,000 tons per season operating
April through November. For this
project, the plant operated at 450
TPH to inline blend the Delta S
rejuvenator. Trucks loaded out of the
Commercial Asphalt Company silos
continued on page 27

We buy and sell used
asphalt plant equipment

The pavement maintenance
project took place Sept. 11-15,
2017, with milling performed
by a subcontractor and paving
performed by Hennepin County
Public Works. "The in-house

866-647-1782

www.reliableasphalt.com
908810_Reliable.indd 1

Asphalt Pavement Magazine - May/June 29/03/18
2018 * 25
11:35 AM


http://www.reliableasphalt.com http://www.reliableasphalt.com

Asphalt Pavement Magazine - May/June 2018

Table of Contents for the Digital Edition of Asphalt Pavement Magazine - May/June 2018

Chairman’s Commentary
Industry News
Tools for the Trade
A Green Answer for Higher Recycling
Reducing Rolling Resistance to Reduce Emissions
Recycled Tire Rubber Mixture Yields High-Performing Road
The Pavement Economics Committee: A Powerful Partnership
Focus on the Field: Job Spotlight
Industry Events
Index of Advertisers/Advertisers.com
Perspectives
Asphalt Pavement Magazine - May/June 2018 - intro
Asphalt Pavement Magazine - May/June 2018 - cover1
Asphalt Pavement Magazine - May/June 2018 - cover2
Asphalt Pavement Magazine - May/June 2018 - 3
Asphalt Pavement Magazine - May/June 2018 - 4
Asphalt Pavement Magazine - May/June 2018 - 5
Asphalt Pavement Magazine - May/June 2018 - 6
Asphalt Pavement Magazine - May/June 2018 - 7
Asphalt Pavement Magazine - May/June 2018 - 8
Asphalt Pavement Magazine - May/June 2018 - Chairman’s Commentary
Asphalt Pavement Magazine - May/June 2018 - 10
Asphalt Pavement Magazine - May/June 2018 - Industry News
Asphalt Pavement Magazine - May/June 2018 - 12
Asphalt Pavement Magazine - May/June 2018 - 13
Asphalt Pavement Magazine - May/June 2018 - 14
Asphalt Pavement Magazine - May/June 2018 - 15
Asphalt Pavement Magazine - May/June 2018 - 16
Asphalt Pavement Magazine - May/June 2018 - 17
Asphalt Pavement Magazine - May/June 2018 - Tools for the Trade
Asphalt Pavement Magazine - May/June 2018 - 19
Asphalt Pavement Magazine - May/June 2018 - 20
Asphalt Pavement Magazine - May/June 2018 - 21
Asphalt Pavement Magazine - May/June 2018 - A Green Answer for Higher Recycling
Asphalt Pavement Magazine - May/June 2018 - 23
Asphalt Pavement Magazine - May/June 2018 - 24
Asphalt Pavement Magazine - May/June 2018 - 25
Asphalt Pavement Magazine - May/June 2018 - 26
Asphalt Pavement Magazine - May/June 2018 - 27
Asphalt Pavement Magazine - May/June 2018 - Reducing Rolling Resistance to Reduce Emissions
Asphalt Pavement Magazine - May/June 2018 - 29
Asphalt Pavement Magazine - May/June 2018 - 30
Asphalt Pavement Magazine - May/June 2018 - 31
Asphalt Pavement Magazine - May/June 2018 - Recycled Tire Rubber Mixture Yields High-Performing Road
Asphalt Pavement Magazine - May/June 2018 - 33
Asphalt Pavement Magazine - May/June 2018 - 34
Asphalt Pavement Magazine - May/June 2018 - 35
Asphalt Pavement Magazine - May/June 2018 - 36
Asphalt Pavement Magazine - May/June 2018 - 37
Asphalt Pavement Magazine - May/June 2018 - 38
Asphalt Pavement Magazine - May/June 2018 - 39
Asphalt Pavement Magazine - May/June 2018 - The Pavement Economics Committee: A Powerful Partnership
Asphalt Pavement Magazine - May/June 2018 - 41
Asphalt Pavement Magazine - May/June 2018 - 42
Asphalt Pavement Magazine - May/June 2018 - 43
Asphalt Pavement Magazine - May/June 2018 - 44
Asphalt Pavement Magazine - May/June 2018 - 45
Asphalt Pavement Magazine - May/June 2018 - 46
Asphalt Pavement Magazine - May/June 2018 - 47
Asphalt Pavement Magazine - May/June 2018 - Focus on the Field: Job Spotlight
Asphalt Pavement Magazine - May/June 2018 - 49
Asphalt Pavement Magazine - May/June 2018 - 50
Asphalt Pavement Magazine - May/June 2018 - 51
Asphalt Pavement Magazine - May/June 2018 - Industry Events
Asphalt Pavement Magazine - May/June 2018 - 53
Asphalt Pavement Magazine - May/June 2018 - 54
Asphalt Pavement Magazine - May/June 2018 - Index of Advertisers/Advertisers.com
Asphalt Pavement Magazine - May/June 2018 - 56
Asphalt Pavement Magazine - May/June 2018 - 57
Asphalt Pavement Magazine - May/June 2018 - Perspectives
Asphalt Pavement Magazine - May/June 2018 - cover3
Asphalt Pavement Magazine - May/June 2018 - cover4
https://www.nxtbook.com/naylor/NAPS/NAPS0318
https://www.nxtbook.com/naylor/NAPS/NAPG0018
https://www.nxtbook.com/naylor/NAPS/NAPS0218
https://www.nxtbook.com/naylor/NAPS/NAPS0118
https://www.nxtbook.com/naylor/NAPS/NAPS0617
https://www.nxtbook.com/naylor/NAPS/NAPS0517
https://www.nxtbook.com/naylor/NAPS/NAPS0417
https://www.nxtbook.com/naylor/NAPS/NAPS0317
https://www.nxtbook.com/naylor/NAPS/NAPS0217
https://www.nxtbook.com/naylor/NAPS/NAPS0117
https://www.nxtbook.com/naylor/NAPS/NAPS0616
https://www.nxtbook.com/naylor/NAPS/NAPS0516
https://www.nxtbook.com/naylor/NAPS/NAPS0416
https://www.nxtbook.com/naylor/NAPS/NAPS0316
https://www.nxtbook.com/naylor/NAPS/NAPG0016
https://www.nxtbook.com/naylor/NAPS/NAPS0216
https://www.nxtbook.com/naylor/NAPS/NAPS0116
https://www.nxtbook.com/naylor/NAPS/NAPS0615
https://www.nxtbook.com/naylor/NAPS/NAPS0515
https://www.nxtbook.com/naylor/NAPS/NAPS0415
https://www.nxtbook.com/naylor/NAPS/NAPS0315
https://www.nxtbook.com/naylor/NAPS/NAPG0015
https://www.nxtbook.com/naylor/NAPS/NAPS0215
https://www.nxtbook.com/naylor/NAPS/NAPS0115
https://www.nxtbookmedia.com