1.00 General
1.04 Related Work (to be completed by a
licensed Bomanite contractor except where noted)
a. Preparation work, including sub-grade
preparation, finish grading, constructing formwork, placing and setting screeds, and
furnishing and placement of reinforcement shall be done by a licensed Bomanite contractor
or other qualified contractor.
b. Provide and place concrete.
c. Provide and apply all Bomanite Color
Hardener. Regular grade color hardener is recommended for all application areas except
those subject to heavy pedestrian traffic or heavy vehicular traffic.
d. Provide and apply all Bomacron release
agents. Release agent is a dry powdered, colored agent used to facilitate release of the
imprinting tools from the concrete surface and to provide moderate color variations to the
textured surface.
2.00 Products and Materials
2.01 Concrete Mix Design
a. The concrete shall have a minimum
compressive strength of 3,000 psi in non-freeze areas, 3,500 psi in moderate freeze-thaw
areas and 4,000 psi in severe freeze-thaw areas. Portland cement shall conform to ASTM C
150 Type I, II, or V, depending on soil conditions. Aggregates shall conform to ASTM C 33.
Mixing water shall be fresh, clean and potable. In freeze-thaw areas only, an
air-entraining admixture complying to ASTM C 260 shall be used to achieve an entrained air
content for the particular mix used in accordance with the published recommendations of
the Portland Cement Association and the American Concrete Institute. No admixtures
containing calcium chloride shall be permitted.
2.02 Coloring, Imprinting,
Curing and Sealing Materials
a. Bomanite Color Hardener: The concrete
shall be colored with the following Bomanite Color Hardener color(s):
The grade of the hardener shall be: (choose one) Regular Grade or Heavy Duty Grade.
b. (Optional) Bomacron Release Agent: The
following Bomacron Release Agent color(s) shall be applied to all concrete surfaces to be
imprinted and textured:
3.00 Execution
3.01 Installation Procedures
a. The area to receive Bomanite/Bomacron
imprinted concrete shall have the sub-grade prepared as required as for any concrete slab
on grade.
b. The formwork shall be installed in
accordance with the drawings. The slab thickness shall be consistent with that of ordinary
concrete slabs under the same conditions. (Note to specifier: Bomanite/Bomacron is most
often a 4” thick or greater monolithic slab on grade. However, Bomanite may also be
installed as a
1-1/2” or thicker topping over a base slab.)
c. Provide reinforcement as specified.
d. Control joints and/or expansion joints
shall be provided in accordance with the drawings and the guidelines established by the
American Concrete Institute. As with any concrete slab, Bomanite/Bomacron imprinted
concrete usually contains construction joints, control joints and expansion joints. The
contractor shall advise and work with the architect/engineer to determine the best
location for these joints to minimize the visibility of the joints and to minimize
unsightly cracking.
e. The concrete shall be placed and
screeded to the finished grade and floated to a uniform surface using standard finishing
techniques.
f. Bomanite Color Hardener shall be
applied evenly to the surface of the fresh concrete by the dry-shake method using a
minimum of 60 pounds per 100 square feet/27 kilograms per 9 square meters. It shall be
applied in two or more shakes, floated after each shake and troweled only after the final
floating.
g. (Optional) Bomacron Release Agent
shall be applied evenly to the troweled surface prior to imprinting. (Note to the
specifier: this product should be specified only if the imprinted slab is Bomacron.)
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