© 2010 Utilicor Technologies Inc.
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(4)
It is important to run the entire system with the glycol mixture before
storing the minicor-2, or moving a significant distance during the day.
Wind chill factors can greatly reduce effective temperatures and
increase the likelihood of freezing, so take this into account when
performing the winterizing procedures.
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If you intend to core after the equipment has been winterized, fill the
water tank with warm water and an environmentally acceptable glycol
based additive before leaving for the site. If desired, once the pumps
are turned on, the undiluted glycol in the pipes and hoses can be
collected and saved to be used again. If you are using a diluted
mixture, it can be used to core with.
Note: Depending upon the anticipated temperature, cold weather windshield
washer fluid can be used to treat the system, and will perform adequately as a
winterizing agent in moderately cold temperatures. Follow the temperature
instructions of the manufacturer.
Cold Weather Core Reinstatements
In northern climates, most of the roadwork involving pavement repair and
reinstatement has been limited to the period between April and November
when the ambient temperature is above 40ºF and there is no likelihood of
frost.
Without some form of external heat source or cold weather chemical
additives, no water-soluble cementitious product will set up and gain
strength at temperatures below freezing. These additives can be in the form
of chemical accelerators that speed up the hydration process or antifreezes
that will lower the temperature at which the water in the concrete will freeze
or may involve the entrainment of tiny bubbles of air. Because the addition of
these substances tend to weaken the concrete they are limited in their use to
slabs or concrete structures where compressive strength, rather than bonding
strength, is most important. For this reason these additives cannot be
effectively employed in bonding compounds like Utilibond™ or other
cement-based grouts.
At freezing temperatures ice crystals form on the surfaces to be joined and
prevent the bond from forming. To work in winter weather conditions you
need to heat the surfaces of both the hole and the core to a temperature of at
