3.4
EPOXY-RESIN GROUT
The epoxy adhesive shall be conditioned, proportioned, mixed, applied,
protected, and cured in accordance with the manufacturer's recommendations,
except as otherwise specified herein or indicated on the drawings. The
adjacent surfaces and ambient conditions shall be maintained within the
manufacturer's recommendations. The patch anchors and epoxy adhesive shall
be protected from displacement and disturbances.
3.4.1
Mixing Epoxy-Resin Grout Components
Epoxy-resin grout components shall be mixed in the proportions recommended
by the manufacturer. The components shall be conditioned within 20 to 30
degrees C 70 to 85 degrees F for 48 hours prior to mixing. The two epoxy
components shall be mixed with a power-driven, explosion-proof stirring
device in a metal or polyethylene container having a hemispherical bottom.
The polysulfide curing agent component shall be added gradually to the
epoxy-resin component with constant stirring until a uniform mixture is
obtained. The rate of stirring shall be such that the entrained air is at
a minimum.
3.4.2
Tools and Equipment
Tools and equipment to be used again in the work shall be cleaned before
the epoxy-resin grout sets.
3.4.3
Health and Safety Precautions
Full-face shields shall be provided for mixing, blending, and placing
operations as required. Protective coveralls and neoprene-coated gloves
shall be provided for workers engaged in the operations. Protective creams
of a suitable nature for the operation shall be supplied. Adequate fire
protection shall be maintained at mixing and placing operations. Smoking
or the use of spark- or flame-producing devices shall be prohibited within
15 m 50 feet of mixing and placing operations. The mixing, placing, or
storage of epoxy-resin grout or solvent shall be prohibited within 15 m 50
feet of any vehicle, equipment, aircraft, or machinery that could be
damaged from fire or could ignite vapors from the material.
3.5
MASONRY REPLACEMENT
Masonry shall be replaced with material that matches the original in terms
of composition, color, texture, strength, finishing, and porosity as
closely as possible. If a few isolated masonry units are to be replaced,
each shall be removed without disturbing the surrounding masonry.
Deteriorated masonry units and mortar requiring replacement shall be
removed by hand chiselling. Adjoining masonry units shall not be damaged
during the removal of deteriorated units and mortar. The new element shall
be tested for fitting into its space without mortar. If wedges are used to
support and align the new unit, they shall be covered with at least 38 mm
1-1/2 inches of mortar when pointing is complete. The four sides and back
of the space shall be covered with sufficient mortar to ensure that there
will be no air spaces when the new unit is set. The new unit shall be
lined up and set by tapping it into place with a wooden or rubber mallet.
Face of new unit shall align with that of existing masonry. Joints shall
be repointed to match the rest of the wall after new units have been
properly installed and adjusted. Replacement areas shall be cleaned with a
non-metallic brush and water to remove excess mortar
SECTION 04900
Page 19
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