machine. The honed surface of finished terrazzo shall show not less than
70 percent of the area as exposed aggregate evenly distributed, and shall
conform in appearance to the approved samples. Finished thickness of
terrazzo topping shall be a minimum of 13 mm 1/2 inch.]
3.2.5.1
Rough Grinding
After topping has cured, the terrazzo shall be machine ground using the wet
method, to a true even surface using No. 24 or finer grit followed by No.
80 grit or finer grit stone. Finish floor surface shall not vary by more
than 2 mm per meter 1/4 inch in 10 feet.
3.2.5.2
Grouting
After rough grinding, the floor shall be cleansed with clean water and
rinsed. After removing excess rinse water, the floor shall be grouted
using identical portland cement, color and pigments as used in the topping
taking care to fill voids. After the grout has attained its initial set,
the surface shall be cured for a minimum of 72 hours.
3.2.5.3
Fine Grinding
After grout has cured, the surface shall be ground with fine grit stones
until all grout is removed from the surface. Upon completion of grinding,
the terrazzo flooring shall show a minimum of 70 percent of marble chips.
3.3
CLEANING AND SEALING
The terrazzo shall be washed with a neutral cleaner and where required
shall be cleaned with a fine abrasive to remove stains or cement smears.
The cleaned surfaces shall be rinsed. When dry, a terrazzo sealer shall be
applied in accordance with the manufacturer's directions.
3.4
PROTECTION
The terrazzo work shall be covered and protected from damage until
completion of the work of all other trades.
-- End of Section --
SECTION 09410
Page 9
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