3.1.1
Application of Surface Hardener
Apply first shake to floated concrete adjacent to forms, entry ways,
columns and walls, where moisture will be lost first. Apply two-thirds of
the specified total shake immediately following the floating of total area.
Material shall be applied at a minimum rate of 9.76 kg/square meter2
pounds per square foot of slab. Bleed water shall not be present during or
following the application of this shake. Distribute Evenly. DO NOT THROW
THE SHAKE.
Wood bull floats can be used as soon as the shake has absorbed
moisture (indicated by the darkening of the surface). Float just
sufficiently to bring moisture from base slab through the shake. Finishing
machines with float blades shall be used to "open" the surface, prior to
the application of the remaining one-third of the total specified shake,
and shall be used to incorporate this second shake. Surface shall be
further compacted by a second mechanical floating, if time and setting
characteristics of the concrete will allow, without removing of the cement
surface paste from the metallic aggregate system. AT NO TIME SHALL WATER
BE ADDED TO THE SURFACE.
As surface further stiffens, indicated by loss
of sheen, it shall be hand or mechanically troweled with blades relatively
flat. Trowel blades should be run as slowly as possible, to achieve the
desired finish. Excessive trowel blade speed will "burn" or darken the
floor surface resulting in a possible loss of the desired even surface
color. All marks and pinholes shall be removed in the raised trowel
operation. DO NOT OVER FINISH. Do not burnish trowel. Type or texture of
surface shall conform to job mock-up.
3.1.2
Field Service
During the initial periods of installation, manufacturer of surface
hardener shall provide, at no cost, the service of a trained, full-time
employee of the manufacturer, to aid in securing the proper use of all
prescribed floor finish products. A minimum of 21 days notice shall be
given by the Contractor, to the manufacturer, to arrange a "pre-job
conference, related to application procedures, and a minimum of 7 days
notice shall be given, prior to installation of the product. At discretion
of the Contracting Officer, the manufacturer shall videotape pre-job
conference and random placement of surface hardener. Video tape shall be
supplied by the Contractor. Original video tape shall be delivered to the
Contracting Officer, upon completion of the finish operations.
3.1.3
Curing and Protection (Water Based Wax Emulsion)
Refer to ACI 308.1. Floors, finished with the non-rusting,
metallic-aggregate surface hardener, shall be cured as recommended by the
manufacturer of the surface hardener. When high efficiency membrane curing
compound is recommended, apply the membrane curing compound immediately
after the floor surface has hardened sufficiently, so surface will not be
marred by the application. Compound shall be applied uniformly, over the
entire surface, to meet the required moisture retention of ASTM C 1315, at
a maximum rate of 6.136 square meters per liter250 square feet per gallon.
When dry, the coating shall be protected from droppings of plaster, paint,
dirt, and other debris, by a covering of scuff-proof building paper.
Adequate provision shall be made for maintaining the concrete temperature
at 50 degrees F., or above during the curing period.
Floor shall remain
covered and be kept free of traffic and loads for at least 10 days after
completion. At the direction of the Contracting Officer, the curing
compound shall be removed between 2 and 4 weeks after placement.
SECTION 03010N
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