Pavement Preservation Journal - Summer 2017 - 33

IMAGE CREDIT: PAVEMENT TECHNOLOGY, INC.
IMAGE CREDIT: PAVEMENT TECHNOLOGY, INC.

After two years, maltene-rejuvenated pavement does not show aggregate
loss compared to untreated section

After 32 years, 2009 photo shows performance of 1977 maltene-based rejuvenator
emulsion-treated pavement in Cleveland, Ohio

recycling agents made from bio-based oils
have been marketed and sold as rejuvenating agents," say NCAT's Willis and Tran.
"A true rejuvenator changes what's
underneath, by replacing missing maltene oils and resins," Durante said. "Most
of the bio-based materials are composed
of various diluents derived from agricultural sources. These diluents may be an oil
extract of citrus peels called d-limonene
or were created from the production of
bio-diesel from soy beans known as
methyl soyate or methyl esters. These
types of products will dissolve asphalt
binder to soften it but cannot replace the
natural petroleum oils and resins missing from the asphalt binder. They provide workability, softening the asphalt;
but there's no improvement in durability
because they can't add back the missing
maltene fractions."

REJUVENATOR EMULSIONS
An asphalt emulsion is a homogeneous
mixture of two insoluble substances: oil
and water. In it, particles of liquid asphalt
(the dispersed phase) are surrounded by
molecules of water (the continuous phase).
Asphalt emulsions are produced by
dispersing tiny globules of asphalt into
water treated with a small quantity of
emulsifying agent. The dispersion takes
place in a powerful blender, called a colloid mill, where spinning blades break or
shear the liquid asphalt into suspended
microscopic particles. The water, or soap
solution, is immediately introduced to form
the emulsion.
The emulsifier-an engineered surfactant (detergent) or surface-active
agent-maintains the microscopic asphalt
droplets in a stable suspension, keeping
them from recombining. The amount

and type of surfactant used, along with
other variables, controls properties of the
emulsion critical to performance in the
field application.
Maltene-based rejuvenator emulsions
like Reclamite aren't strictly asphalt emulsions, but they are an emulsion manufactured from a naphthenic crude stock. The
naphthenic base is wax free, has a natural
low pour point and has excellent solvency,
allowing it to penetrate and be absorbed.
Typically rejuvenator emulsions
are spray-applied at a rate of 0.04 to
0.10 gal./sq. yd.) for a diluted maltenebased rejuvenator emulsion, placed by a
computerized distributor truck, according to
FP2 Inc. The rejuvenator restores the components of asphalt lost in the aging process,
and it's designed to penetrate, flux and
co-mingle with the existing asphalt binder.
"Maltene-based rejuvenators may offer
a low-cost and effective pavement preservation treatment when applied correctly on pavements in newer condition,
or in the mid-to-higher pavement condition index (PCI) range," FP2 reports in its
Preservation Toolbox.
As always, preservation treatments must
be the right treatment, placed on the right
road at the right time. Therefore rejuvenating emulsion applications should
be used on mid-to-higher PCI asphalt
pavements that are structurally sound.
They can also be effective on aged chip
seals, encouraging chip retention by
slightly softening the binder and resetting the chip. They are very effective for
pavement-shoulder preservation.
However, there is a limit to their performance. Rejuvenator emulsions should not
be used on pavements with moderately or
severely distressed surfaces, pavements
with poor skid resistance or rutting, or roads
that cannot be closed or partly closed to
traffic during the curing period, FP2 reports.
And rejuvenator emulsions, if improperly
applied, may initially reduce skid resistance, especially when applied too heavily,
FP2 says, adding usually they are sanded
to reduce friction loss.
PART OF PROGRAM
Asphalt emulsion-based rejuvenators have
a place alongside chip seals and slurry surfacings in agency pavement preservation
programs, experience shows.

Summer 2017 | PAVEMENT PRESERVATION JOURNAL

33



Table of Contents for the Digital Edition of Pavement Preservation Journal - Summer 2017

President’s Message
National Center in New Hands as Founder Galehouse Steps Aside
New ‘Synergy’ Theme of Aema-Arra-Issa Combined Meeting
Emulsions in Focus at Isaet 2016
Counties Benefit From Interactive Systems Preservation Resource
Infrastructure a Bipartisan Business
Boot Camp Boosts Preservation Interest
Fountain of Youth: Asphalt Maltene Rejuvenators Add Life to Aging Pavements
Index of Advertisers
Pavement Preservation Journal - Summer 2017 - Intro
Pavement Preservation Journal - Summer 2017 - cover1
Pavement Preservation Journal - Summer 2017 - cover2
Pavement Preservation Journal - Summer 2017 - 3
Pavement Preservation Journal - Summer 2017 - 4
Pavement Preservation Journal - Summer 2017 - 5
Pavement Preservation Journal - Summer 2017 - 6
Pavement Preservation Journal - Summer 2017 - 7
Pavement Preservation Journal - Summer 2017 - 8
Pavement Preservation Journal - Summer 2017 - President’s Message
Pavement Preservation Journal - Summer 2017 - 10
Pavement Preservation Journal - Summer 2017 - National Center in New Hands as Founder Galehouse Steps Aside
Pavement Preservation Journal - Summer 2017 - 12
Pavement Preservation Journal - Summer 2017 - 13
Pavement Preservation Journal - Summer 2017 - 14
Pavement Preservation Journal - Summer 2017 - 15
Pavement Preservation Journal - Summer 2017 - New ‘Synergy’ Theme of Aema-Arra-Issa Combined Meeting
Pavement Preservation Journal - Summer 2017 - 17
Pavement Preservation Journal - Summer 2017 - 18
Pavement Preservation Journal - Summer 2017 - Emulsions in Focus at Isaet 2016
Pavement Preservation Journal - Summer 2017 - 20
Pavement Preservation Journal - Summer 2017 - 21
Pavement Preservation Journal - Summer 2017 - Counties Benefit From Interactive Systems Preservation Resource
Pavement Preservation Journal - Summer 2017 - 23
Pavement Preservation Journal - Summer 2017 - 24
Pavement Preservation Journal - Summer 2017 - 25
Pavement Preservation Journal - Summer 2017 - 26
Pavement Preservation Journal - Summer 2017 - 27
Pavement Preservation Journal - Summer 2017 - 28
Pavement Preservation Journal - Summer 2017 - Infrastructure a Bipartisan Business
Pavement Preservation Journal - Summer 2017 - 30
Pavement Preservation Journal - Summer 2017 - Boot Camp Boosts Preservation Interest
Pavement Preservation Journal - Summer 2017 - Fountain of Youth: Asphalt Maltene Rejuvenators Add Life to Aging Pavements
Pavement Preservation Journal - Summer 2017 - 33
Pavement Preservation Journal - Summer 2017 - 34
Pavement Preservation Journal - Summer 2017 - 35
Pavement Preservation Journal - Summer 2017 - 36
Pavement Preservation Journal - Summer 2017 - Index of Advertisers
Pavement Preservation Journal - Summer 2017 - 38
Pavement Preservation Journal - Summer 2017 - cover3
Pavement Preservation Journal - Summer 2017 - cover4
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