wide and 25 mm deep1 inch wide and 1 inch deep.
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3.8.2.1
Preparation
Clean cracks by saw cutting or routing to provide the proper profile for
sealants. After the crack is sawcut or routed, clean the surfaces by
sandblasting and/or waterjetting. Adjust the height, angle of inclination
and the size of the nozzle as necessary to provide satisfactory results.
Provide protective covers and barriers as required to prevent over-spray
onto adjacent surfaces. Remove dust, dirt and loosely bonded materials
resulting from cleaning. Dry surfaces to receive repair material as
recommended by the grout or polymer manufacturer.
[3.8.2.2
Epoxy Grout
Apply epoxy grout at a thickness recommended by the manufacturer. Work
grout into place and consolidate thoroughly so that contact surfaces are
wetted by the grout. Finish surface of grout to the required texture. Do
not feather edge epoxy grout onto adjacent surfaces.
]3.8.2.3
Dry-Pack Mortar
Coat the surfaces of the crack with a slurry consisting of equal parts
portland cement and fine sand mixed with water to a fluid paste
consistency. Place the mortar immediately after applying the slurry.
Place mortar in approximately 10 mm (3/8-inch)3/8-inch lifts, compact each
lift thoroughly with a blunt stick or hammer, and scratch the surface to
promote bonding with subsequent lifts. Place consecutive layers
continuously. Finish the top layer flush with the surrounding concrete and
cure with saturated burlap or curing compound.
3.8.2.4
Curing
**************************************************************************
NOTE: If the referenced specifications are not
included in the project specification, applicable
portions should be inserted here.
**************************************************************************
Cure epoxy materials in accordance with manufacturer's recommendations.
Cure dry-pack mortar in accordance with Section [03300A CAST-IN-PLACE
STRUCTURAL CONCRETE][03301A CAST-IN-PLACE STRUCTURAL CONCRETE FOR CIVIL
WORKS][Section 03307 CONCRETE FOR MINOR STRUCTURES].
3.8.3
Gravity Crack Filling
3.8.3.1
Surface Preparation
Clean concrete surfaces that are contaminated with oil, grease or dirt
prior to beginning surface preparation in the area. Use only detergents or
proprietary cleaners formulated for removal of contaminants from concrete,
and use them in accordance with the manufacturer's written instructions.
Do not use solvents for removal of oil or grease. Remove all traces of
cleaning agents and contaminants from the surface and cracks. Perform
final surface cleaning immediately prior to application of gravity filling
in accordance with paragraph REMOVAL OF EXISTING CONCRETE, subparagraph
Surface Preparation. Dry surfaces to receive repair material as
recommended by the grout or polymer manufacturer.
SECTION 03931
Page 61
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