Pavement Preservation Journal - Summer 2013 - (Page 34)
In Texas, Fog Seals
Should Last 18 Months
By Yetkin Yildirim, P.E.
he mission of the Texas
Center (TPPC) is to promote
the use of pavement
preservation strategies. To this
effect, TPPC expands upon the use
of fog seals in its current newsletter
by detailing their advantages and
disadvantages in maintaining
Fog seals consist mainly of a
diluted asphalt binder that is applied
directly to the pavement surface. The
main types of binders used in fog
seals are cutbacks, emulsions, and
polymer-modified emulsions. Fog seal
materials used in Texas generally have
a wide range of properties, but most
are water-based emulsion materials.
A fog seal is applied directly to a
pavement surface in spray form. When
used properly on porous surfaces,
fog seals can seal the pavement,
lengthen the pavement surface life,
provide some pavement edge-shoulder
delineation, and prevent raveling.
They also can be used during seal
coat applications as a flush coat, which
holds aggregate in place and protects
windshields from flying rocks.
The preventive maintenance of
existing roadways, as opposed to the
construction of new ones, has gained
momentum in the United States. Fog
seals have been a cost-effective means
of preventive maintenance in Texas
and other states for many years.
WHEN TO USE A FOG SEAL
Fog seals function properly only
when they achieve penetration.
Because of this, fog seals should be
used on aged and raveled hot-mix
surfaces and chip-sealed surfaces.
Fog seals have three main functions:
to prevent raveling, to preserve and
protect road conditions, and to seal
and treat cracking and surface defects.
Therefore, fog seals should be used
only on structurally sound pavements
with minor defects. Fog seals decrease
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View past issues of the Pavement Preservation Journal online at www.naylornetwork.com/fpp-nxt
23/04/13 11:00 PM
Table of Contents for the Digital Edition of Pavement Preservation Journal - Summer 2013
‘Thinning Up’ Concrete Overlays for Pavement Preservation
IGGA: After Five Years, Colorado CPR Project Holds Strong
Joint Meeting Brings ARRA, ISSA, AEMA to California Desert
At NCAT Preservation Study, Performance Clues Emerge
Integrated System Keeps Fort Collins ‘Asset Smart’
New Alaska Database Aids Treatment Selection
GPR, FWD Analyze Airfi eld Pavements in South Carolina
TPPC: In Texas, Fog Seals Should Last 18 Months
Caution Due in Using MC-30 as Prime Coat
In Nevada, Cold Recycling Preserves I-80
Index of Advertisers
Pavement Preservation Journal - Summer 2013