Toll Free: 1-800-723-3342
TACK COAT
Phone: 306-721-8888 Fax: 306-721-5118
Toll Free Fax: 1-866-840-5118
caradawntransport@sasktel.net
Celebrating 39 years 1977 – 2016
actually slip on the old surface, creating a
safety hazard on the road.”
She says the ministry has relied on one
type of tack coat product for several de-cades,
but there are now other products
available.
“We would like to give contractors the
option of picking a tack coat product that
best suits their operations and the weather
conditions,” said Anthony. “Some common-ly
available tack coat products are rapid
curing and would reduce delays related to
curing the tack coat. Other products use
stiffer asphalt cement and would pick up
less on truck tires. Recent innovative prod-ucts
are fast curing and promise less pick
up by trucks at the same time.”
Morien says in response to increased
pressure for faster paving, extended paving
seasons and for longer lasting, better per-forming
pavements, innovations in tack
coat formulations and their application
have appeared on the scene in recent years.
“To avoid construction delays, contrac-tors
need tack coats to cure as fast as pos-sible.
While reducing the amount of tack
helps in that regard, the downside is that a
less than optimal amount of tack remains
to maximize bonding,” he said. “Less dilu-tion
can also reduce wait time; however,
this requires a properly equipped tack coat
distributor (spray truck) to achieve uniform
coverage. As for the tack coat itself, a num-ber
of faster setting products are on the
market or in development.”
Morien says these products can also fa-cilitate
colder weather paving, but regard-less
of the approach, “it is important to
ensure the tack coat is fully cured and that
the water released from the tack coat emul-sion
has evaporated prior to paving.”
Conversely, too much tack can create a
slippage plane, which can very quickly re-sult
in deformation and cracking, he says.
“While a tack coat applied at a lower rate
can cure faster and allow paving sooner, too
little tack may not provide sufficient resid-ual
asphalt to properly bond pavement lay-ers.
Although there may be some desire to
reduce application rates – to avoid tracking
and curing delays – the correct amount of
tack coat is extremely important to maxi-mize
pavement performance.”
Janssens says the latest innovations in
tack coat that focus on better bonding and
more rapid set times are helping reduce
traffic congestion.
“Tack coats are best used when
you have multiple thin layers of
asphalt. The thicker the layers,
the less likely they are to unravel
or slip between each other.”
– Jeff Janssens, Sales and Marketing
Representative, McAsphalt Industries Ltd.
46 Think BIG | Quarter 4 2016 | saskheavy.ca
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