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TACK COAT
“The non-tracking working surface re-duces
the possibility of asphalt spraying
up on vehicles and equipment or from be-ing
tracked onto the final lift of asphalt,”
he said. “Non-tracking tack coats are the
newest products being used on the market
today. They provide quicker set up times
and reduce the possibility of being pulled
up or collecting dust and dirt before the fi-nal
asphalt layer is applied.”
Elkadri agrees that it’s vital that the
right amount of tack coating be used.
“Too little tack may not be enough to
provide proper bonding between layers.
Too much tack may cause the tack to bleed
through the pavement, or worse, the ex-cess
tack could cause slippage during the
paving process (new pavement slides off
old pavement because of excess tack mak-ing
it slippery).”
Fortunately, Anthony says she has yet to
see a project in Saskatchewan where too
much tack coat has caused a problem.
“In discussions at the national level,
agencies and experts generally agree that
the problem is not too much tack coat, but
that not enough tack coat is used and it
tends to be picked up and removed by as-phalt
trucks prior to paving,” she said.
Elkadri says he is pleased that there
have been improvements made regarding
cure time, tackiness of the surface once
broken, additives used to improve bond-ing
and application rate.
“A combination of these innovations ex-ist
in many products available today and
can help contractors reduce wait times
and improve overall customer satisfaction.
It’s important to note that there are many
factors that will determine the type of tack
coat to be used. Some of the characteris-tics
that can be manipulated include: cure
time, shelf life, tackiness, application rate
and last but certainly not least, cost.”
Added Anthony, “Lately, suppliers have
formulated proprietary products that
promise fast curing and less tracking off,
and field results in other provinces and
states are very positive. Whether com-mon
products or brand new proprietary
formulas, the Ministry of Highways and
Infrastructure is very interested in work-ing
with contractors to try these different
products on paving projects.”
This image shows the
tack coat picked off the
road by trucks delivering
asphalt to the paver.
The full lane should
be black, but in this
photo there is no tack
in the wheel paths.
This photo shows the
tack coat is covering
the entire surface
PHOTOS COURTESY OF THE GOVERNMENT OF SASKATCHEWAN
saskheavy.ca | Quarter 4 2016 | Think BIG 47
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