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Description
UNITEX
Segmental Bridge Adhesive (USBA) is a solvent free, two-component, high modulus,
moisture-insensitive epoxy adhesive designed to bond and seal segmental precast
elements. It conforms to the current
ASTM C 881, Type VI requirements. It is
available in three application temperature ranges, LT (low temperature), MT
(medium temperature), and HT (high temperature). Each is specifically designed
for use in the following temperature ranges:
USBA-LT:40°F - 65°F (4°C - 18°C)
USBA-MT:60°F - 85°F (16°C - 29°C)
USBA-HT:80°F - 115°F (27°C - 46°C)
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USE
A
high performance adhesive for bonding and sealing segmental precast elements
with internal tendons and for span-by-span erection when temporary post
tensioning is applied.
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BENEFITS
- Insensitive to moisture
during application, curing, and in service.
- Three formulations
accommodate wide temperature range installations.
- High strength, high
modulus.
- Convenient 2:1 mix ratio by volume.
- Non-sag consistency
allows vertical and overhead installation.
- Lubricates surfaces for
easy location & positioning of shear keys.
Coverage
At a film thickness of 1/16” (1.6 mm) the yield is 26 sq. ft. / gal. (2.4 sq. m. /
L).
Coverage rate is approximate and depends on porosity and profile of concrete.
Packaging
3 gal. / 11.6 L. units (3 one gal. cans)
15 gal. / 58.1 L. units (3 five gal. pails)
165 gal. / 640 L. units (3 fifty-five gal. drums)
Shelf Life is two years in original unopened container.
Store dry at 40°F - 95°F (4°C - 35°C).Condition material to 70°F - 75°F (21°C -
24°C) before using.
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Application
Surface Preparation:Surfaces
must be clean, sound, and free from frost, standing water, laitance, form
release agents, curing compounds and other contaminants. Surfaces may be dry or
damp.
Mixing:USBA is supplied in factory proportioned units
comprised of the correct quantities of component A (resin) and component B
(hardener). Pre-mix each component separately using a slow speed drill (400 rpm).
Pour
two parts of components A and one part of component B by volume into a clean
pail and mix thoroughly for 3 minutes until a uniform gray color is achieved. Mix
only the quantity that can be used within its gel time.
Application:Using a trowel, brush, or gloved hand, apply USBA to
the prepared surfaces of both segments to be joined. Work into the substrate to
ensure complete wetting out of the surface area. Secure the segments firmly
together within the open working time of the epoxy.
COMPLIANCE
ASTM C881:Type VI, Grade 3, Classes D, E, F.
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Laboratory Test
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Results
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Specification
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C 881 Consistency
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¼ inch (6.0 mm) no sag
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¼ inch no sag
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C 881 Gel Time
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45 minutes
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30 minutes minimum
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Open Time (65°F, 85°F,
115°F)
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60 minutes
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C 882 Contact Strength,
2-day
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1,400 psi (9.7 MPa)
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1,000 psi minimum
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D 695 Compressive Strength (24 hours)
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3,000 psi (20.7 MPa)
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2,000 psi minimum
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D 695 Compressive Strength (48 hours)
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7,000 psi (48.3 MPa)
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6,000 psi minimum
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C 882 Bond Strength (2 day Moist)
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1,400 psi (9.7 MPa)
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1,000 psi minimum
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D 648 Heat Deflection Temperature
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140 °F (60 °C)
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120 °F
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Limitations
- Do not add additional fillers or solvents.
- High temperatures will shorten the gel time of USBA.
- Low temperatures will extend the cure time of USBA.
- Use the correct formulation of USBA for the ambient air and surface temperatures.
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Cleanup
Uncured USBA can be removed with approved solvent. Collect with absorbent
material. Flush area with water. Dispose of in accordance with local, state,
and federal disposal regulations. Cured USBA can only be removed mechanically.
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Cautions
- Component A – Irritant
- Component B – Corrosive
- Product is a strong sensitizer. Use of safety goggles and chemical resistant gloves are
recommended.
- Use of a NIOSH/MSHA organic vapor respirator is recommended if ventilation is
inadequate.
- Avoid breathing vapors.
- Avoid skin contact.
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First Aid
Cured USBA is innocuous.
For uncured USBA:
SKIN CONTACT – Remove contaminated clothing. Remove product with an absorbent cloth.
Wash skin area thoroughly with soap and water. (Solvents should not be used
because thy carry product into the skin.)
EYE CONTACT – Flush eyes immediately with water for a minimum of 15 minutes.
Contact physician immediately.
RESPIRATORY PROBLEMS – Seek fresh air and/or medical attention.
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Disclaimer of Warranties: Neither manufacturer nor seller have any knowledge
or control concerning the purchaser's use of the product. No expressed warranty
is made by manufacturer or seller with respect to the results of any use of the
product or container that the product comes in. No implied warranties
including, but not limited to, an implied warranty of merchantability or an
implied warranty of fitness for a particular purpose are made with respect to
the product. Neither manufacturer nor seller assume any liability for personal
injury, loss or damage resulting from the use of the product. In the event that
the product shall prove defective, buyer's exclusive remedy shall be as
follows: Seller or manufacturer shall, upon request of buyer, replace any
quantity of the product which is proven to be defective or shall, at its
option, refund the purchase price of the product upon return of the product.
Manufacturer shall not be responsible for the use of this product in a manner
to infringe on any patent held by others.
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