|
Architectural Specifications
SECTION 03360 - SPECIAL CONCRETE FLOOR FINISHES
PART 1 GENERAL
1.1 RELATED
DOCUMENTS
A. Drawings and
general provisions of Contract, including General and
Supplementary Conditions and Division ____________
Specification Section, apply to this Section.
1.2 SUMMARY
A. This Section
includes polished concrete finish in accordance with
Hardscapes™ concept for interior concrete flatwork. Polished
concrete finishes for precast concrete, vertical
cast-in-place concrete, and exterior concrete are specified
in the sections for those types of concrete.
B. Furnish all
labor, material, equipment and services necessary for the
dry diamond grinding and polishing of concrete floors in
accordance with the Hardscapes™ concept.
C. Applying
densifying impregnator/sealer and polishing to specified
sheen level and aggregate exposure.
D. Concrete must be
cured a minimum of 28 days prior to polishing.
1.3 REFERENCES
A. American
Concrete Institute (ACI):
1. ACI302.1R-89,
Guide for Concrete Floor and Slab Construction.
B. American Society
for Testing and Materials:
1. ASTM C779, Standard Test Method for
Abrasion of Horizontal Concrete Surfaces.
2. ASTM C805, Impact Strength.
3. ASTM G23-81, Ultraviolet Light & Water
Spray.
4. ASTM 1028, Co-efficient of Friction.
5. ASTM C 150, Type I, II Portland cement
conformity, depending on soil conditions.
6. ASTM C 33, Aggregate conformity.
C. Other Tests:
1. Reflectivity. Measured in candle
power.
2. Gloss
reading.
1.4 SUBMITTALS
A. Submit the
following in accordance with Division ______ Section
“Submittal Procedures”.
B. Product data for
each grinding machine, including all types of grinding
heads, dust extraction system, joint filler, concrete
densifying impregnator, penetrating sealer, and any other
chemicals used in the process.
C. Applicators
qualification data.
D. Polished
concrete samples: size _______, for each Polished Concrete
finish required.
1.4 QUALITY
ASSURANCE
A. Basis of design:
Hardscapes™, manufactured by Global Polishing for Sherwin
Williams.
B. Approved
Applicators:
1.__________________________________________________
2.__________________________________________________
3.__________________________________________________
C. Pre Installation
Conference: Conduct conference at project site to comply
with requirements in Division ______, Section “Project
Management and Coordination”.
D. Provide project
names, addresses, contact names, phone numbers of at least
(3) three projects of similar scope completed by the
installer.
E.
Installer/applicator shall be certified by concrete finish
equipment and chemical manufacturer and shall provide
adequate number of skilled workmen who are thoroughly
trained and experienced in the necessary craft.
F. Manufacturer’s
Certification: Provide a letter of certification from both
the equipment and chemical manufacturer stating that the
installer is a certified applicator and is familiar with
proper procedures and installation requirements recommended
by the manufacturer.
G. Mock-ups:
1. General Contractor to notify
applicator 7 days prior to pour to schedule finish of mock-
up.
2. Reserve 100 square feet for each color
and finish at location adjacent to floor that will receive
polish, but will be covered with another flooring material.
Mock-up floor shall be placed on the same day, preferably
the same pour as the floors to receive polish.
3. Install mock-ups to verify selections
made under sample submittal and to demonstrate methods and
workmanship proposed for the project. If mock-up not
possible, submitted samples will be accepted as demonstrated
methods & workmanship.
4. Aggregate selected must be tested to
ensure it will accept polish.
5. If stand alone mockup required, form
should be clean and free from extraneous substance and be at
least a 12’ x 12’ with a level plywood bottom on level
ground with unobstructed access around all four sides.
6. Control joints should be included in
mock-up. Sawing performed by General
Contractor can begin as soon as the
surface is firm enough not to displace any of the aggregate.
7. Edges should be included in mock-up.
8. Approved mock-ups may become part of
the completed work if undisturbed at time of substantial
completion.
H. Protection:
General Contractor shall protect areas to receive polished
concrete finish at all times during construction to prevent
oils, dirt, metal, excessive water and other potentially
damaging materials from affecting the finished concrete
surface. Protection measures listed below shall begin
immediately after the concrete slab is poured:
1. All hydraulic powered equipment shall
be diapered to avoid staining of the concrete.
2. All vehicle parking shall be
prohibited on the finish slab area. If necessary to
complete their scope of work, drop cloths shall be placed
under vehicles at all times.
3. No pipe cutting machine shall be used
on the finish floor slab.
4. Steel shall not be placed on the
finish slab to avoid rusting.
5. Acids and acidic detergents will not
come in contact with slab.
6. All painters will use drop cloths on
the concrete. If paint gets on the concrete, it must be
immediately removed.
7. All trades will be informed that the
slab must be protected at all times.
I. Environmental
Limitations
1. Comply with manufacturers written
instructions for substrate temperature and moisture content,
ambient temperature and humidity, ventilation and other
conditions affecting chemical performance.
2. Flatness and levelness
a. Finish Concrete shall have a minimum
Floor Flatness rating of at least 40.
b. Finish Concrete shall have a minimum
Floor Levelness rating of at least 30.
c. Finish Concrete shall be cured a
minimum of 28 days or at which point equipment can be put on
the slab and does not displace aggregate.
3. Application of finish system shall
take place a minimum of 21 days prior to fixture & trim
installation and/or substantial completion.
4. Finish Concrete area shall be closed
to traffic during finish floor application and after
application, for the time as recommended by manufacturer.
J. Concrete Mix
Design:
1. Concrete Mixture
shall be 3500 PSI or higher, non air entrained.
a. Any admixtures, plasticizers, slag,
fly ash or anything taking the place of Portland-based
cement shall be kept to a minimum.
b. The cement shall be Portland Cement
Type I, conforming to ASTM C 150.
c. Maintain concrete temperature below 85
degrees. Keep concrete as cool and moist for as long as
possible. In essence, decrease rate of hydration and drying
to minimize cracking.
d. Wet cures are most suitable, but if
this cannot be achieved, use a penetrating, dissipating or
wax based cure and seal. Do not use a densifier/hardner
material due to the grinding of the floor after 6 days.
e. All mix designs must be approved by
Architect. Send all approved mix designs to Applicator.
f. The Engineer/Architect shall determine
the saw cut patterns, color and layout.
g. Color loads for integral color should
never be smaller than 3 cubic yards.
h. Use on source for cement, aggregates
and pozzolans throughout the job. Monitor and control
incoming material consistency. Do not use calcium
chloride-based admixtures. Non-chloride admixtures may be
used.
i. Wash out all drums before loading.
Keep slumps consistent with a maximum of 4. Minimize driver
added water maintaining a .45 water content ratio.
j. Place concrete to achieve as true and
smooth a top surface as possible. Mounds, or dips are not
acceptable. GC shall control overall flatness and
levelness, including on sloping areas to within tolerances
permitted by specification – ASTM E1155.
k. Slab shall be protected from indention
and footprints during pour and curing.
PART 2 PRODUCTS
2.1 POLISHING
MATERIALS
A. Three-phase 480
Volt generator and step down transformer.
B. 2, 3 or 4 head
counter rotating variable speed Hardscapes™ Approved Floor
Grinder with at least 600 pounds down pressure. For
example: HTC 2500IX, HTC 950RX or HTC 800 HD, STI Prepmaster
3030, King PG820, Powerstar Mongrel.
C. Hardscapes™
approved dust extraction system, pre-separator, and squeegee
attachments with minimum flow rating of 322 cubic feet per
minute.
D. Grinding Heads:
1.
Hardscapes™ Metal bonded 16, 25, 40, 80, 150 and/or 300
grits.
2. Hardscapes™ Resin bonded diamonds,
100, 200, 400, 800, 1500 and 3000 grits.
E. Grinding Pads for
Edges
1. 40,
60, and 120 grits.
2. 100, 200,400, 800, 1500 and 3000
grits.
F. Hand Grinder with
dust extraction attachment and pads.
G. Sher-Crete
Concrete Hardener™: No
Substitutions
H. Control Joint and
Saw Cut Filler, two part filler or polyurea as specified by
construction manager.
I. Pastecoat™, or
Tileclad™ floor striping material and layout to
specification by owner/architect.
J. A ready to use,
penetrating, dye or reactive stain that chemically combines
with cured concrete to produce permanent, variegated or
translucent color effects or a hydrolyzed, lithium quartz or
silicate compound, that works by penetrating and reacting
with mineral compounds and/or siliceous materials to create
a translucent or marbled color effects.
PART 3 EXECUTION
3.1 PREPARATION
A. Installer shall
examine and approve concrete substrate for conditions
affecting performance of finish. General Contractor shall
correct conditions that are found to be out of compliance
with the requirements of this section. Repairs are not
acceptable unless specifically approved on a case-by-case
basis by the Architect.
B. Verify that base
slab meet finish and surface profile requirements listed in
Division 3, Section “Cast in Place Concrete”.
C. Provide floor
clean of materials and debris.
D. Protect adjacent
surfaces as required to prevent damage by the concrete
polishing procedure.
E. Setup grinding
machine, dust extraction system, tooling, and generator.
F. Ensure floor
cured to accept polishing application.
3.2 POLISHED
CONCRETE APPLICATION
A. Applicator shall
examine the areas and conditions under which work of this
section will be provided and the General Contractor shall
correct conditions detrimental to the timely and proper
completion of the work and the Applicator shall not proceed
until unsatisfactory conditions are resolved.
B. Grind the
concrete floor to within 2 -3 inches of walls with 16, 25,
40 and 80 grit removing construction debris, floor slab
imperfections and until there is a uniform scratch pattern
and desired concrete aggregate exposure is achieved. Vacuum
the floor thoroughly using a squeegee vacuum attachment.
C. Apply material
approved by architect for color effects in accordance with
the architectural drawings and the manufacturers recommended
guidelines.
D. Fill construction
joints and cracks with filler products as specified in
accordance with manufacturers instructions colored to match
(or contrast) with concrete color as specified by architect.
E. (If specified)
Bull float cementations grout coat onto surface to fill all
voids, cement grout to match (or contrast) color of
concrete, allow to cure overnight. (If specified) Apply
epoxy grout coat onto surface; allow curing overnight, as
specified by architect or construction manager.
F. Grind the floor
to within 2 - 3 inches of walls with metal bonded diamond
grits of 150 and/or 300, grinding 90 degrees from each
previous grind and removing all the scratches from the
previous grit. Vacuum the floor thoroughly after each grind,
using a squeegee vacuum attachment.
G. (If specified)
Grind the edges with 40, 60 and 120 grit grinding pads,
removing all of the scratches from the previous grit. Vacuum
the floor thoroughly after each grind, using a squeegee
vacuum attachment.
H. Polish the floor,
to desired sheen level, with Hardscapes ™ resin bonded
diamond grits of 100, Apply Sher-Crete Concrete Hardener™ densifying impregnator
undiluted at approximately 400-600 square feet per gallon
using a soft, long bristled broom. Cover the entire work
area liberally and allow to sit for 10 minutes. Apply again
to areas where the densifying impregnator has soaked in and
allow to sit for an additional 20 minutes. Allow material to
dry. Do not remove any of the Sher-Crete Concrete Hardener™ from the floor 200,
400, 800, 1500 and 3000, first polishing the edges (If
specified) with pads of the same grit and then the field of
the floor, removing all scratches from the previous grit.
After each polish, clean the floor thoroughly using clean
water and an auto scrubber or a mop and a wet vacuum.
I. (If specified)
Apply Sherwin Williams Sher-Crete Concrete Hardener™ Sher-Crete
Sealer For Stained or Polished Concrete™, buff with Black
Thickline Strip Pad.
J. Upon completion,
the work shall be ready for final inspection and acceptance
by the customer.
3.3 PROTECTION
A. Protect the
floors from damage until substantial completion.
PART 4 SCHEDULES
4.1 SHEEN
A. Polished Concrete
Level 1:
1. At a
distance of 100 feet, the floor will reflect images from
side lighting.
B. Polished Concrete
Level 2:
1. At a distance of 30 to 50 feet, the
floor will clearly reflect from side and overhead lighting.
C. Polished Concrete
Level 3:
1. Looking straight down, the floor will
clearly reflect overhead and side light, with the appearance
of the floor looking wet.
4.2 EXPOSED
AGGREGATE
A. Exposure rate
per Architect/Owner selection.
4.3 EDGES
A. Painted
B. Honed
C. Polished
D. Graphic
E. Other
4.4 TRANSITIONS
A. Inside
B. Outside
C. Center
D. Other |
