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USACE / NAVFAC / AFCESA / NASA UFGS-09 66 13 (April 2006)
--------------------------
Preparing Activity:
USACE Replacing without change
UFGS-09410 (November 2003)
UNIFIED FACILITIES GUIDE SPECIFICATIONS
References are in agreement with UMRL dated 1 April 2006
Latest change indicated by CHG tags
Section Table of Contents
SECTION 09 66 13
PORTLAND CEMENT TERRAZZO
04/06
PART 1 GENERAL
1.1 REFERENCES
1.2 SUBMITTALS
1.3 DELIVERY AND STORAGE
1.4 ENVIRONMENTAL REQUIREMENTS
1.5 WARRANTY
PART 2 PRODUCTS
2.1 PORTLAND CEMENT
2.2 SAND
2.3 MARBLE CHIPS
2.4 DIVIDER STRIPS
2.5 CONTROL JOINT STRIPS
2.6 COLORANTS
2.7 CURING MATERIAL
2.8 TERRAZZO CLEANER
2.9 SEALER
2.10 SHEET MATERIALS
PART 3 EXECUTION
3.1 TERRAZZO PROPORTIONS
3.1.1 Underbed
3.1.2 Terrazzo Topping
3.2 INSTALLATION
3.2.1 Underbed Placement
3.2.2 Setting Divider Strips
3.2.3 Placing Terrazzo Topping
3.2.4 Curing
3.2.5 Finishing
3.2.5.1 Rough Grinding
3.2.5.2 Grouting
3.2.5.3 Fine Grinding
3.3 CLEANING AND SEALING
3.4 PROTECTION
SECTION 09 66 13
PORTLAND CEMENT TERRAZZO
NOTE: This guide specification covers the requirements for
standard terrazzo
bonded to concrete subfloor.
Comments and suggestions on this guide specification are welcome and should
be directed to the technical proponent of the specification. A listing of
technical
proponents, including their organization designation and telephone number, is
on the Internet.
Recommended changes to a UFGS should be submitted as a
Criteria Change Request
(CCR).
Use of electronic communication is encouraged.
Brackets are used in the text to indicate designer choices or locations where
text must be supplied by the designer.
PART 1 GENERAL
NOTE: Bonded terrazzo is normally 45 mm (1-3/4 inch) total thickness, consisting
of 13 mm (1/2 inch) thick terrazzo topping over a 32 mm (1-1/4 inch) thick underbed.
Where structural movement which may injure the terrazzo is anticipated, installations
should be by the sand cushion (floating) method. Where requirement exists for
sand-cushion or other-type installation method, bases, precast work, or specialized
work such as structural, abrasive, rustic, or venetian terrazzo, or terrazzo
over permanent metal forms, the specification should be revised or a separate
section should be prepared as appropriate.
Areas to receive terrazzo will be shown on the drawings. Color should be indicated
by showing a selected plate number from the NTMA publication, "Terrazzo Design/Technical
Data"
Example: NTMA Terrazzo Color Palette, plate No. S-301-4. Colors selected may
be any combination of standard marble granules of domestic origin available
in the local market.
1.1 REFERENCES
NOTE: This paragraph is used to list the publications cited in the text of
the guide specification. The publications are referred to in the text by basic
designation only and listed in this paragraph by organization, designation,
date, and title.
Use the Reference Wizard's Check Reference feature when you add a RID outside
of the Section's Reference Article to automatically place the reference in the
Reference Article. Also use the Reference Wizard's Check Reference feature
to update the issue dates.
References not used in the text will automatically be deleted from this section
of the project specification when you choose to reconcile references in the
publish print process.
The publications listed below form a part of this specification to the extent referenced. The publications are
referred to within the text by the basic designation only.
ASTM INTERNATIONAL (ASTM) |
|
ASTM C 150 | | (2005) Portland Cement |
|
ASTM C 171 | | (2003) Sheet Materials for Curing Concrete |
|
ASTM C 241 | | (1990; R 1997e1) Abrasion Resistance of Stone
Subjected to Foot Traffic |
|
ASTM C 309 | | (2003) Liquid Membrane-Forming Compounds for
Curing Concrete |
|
ASTM C 33 | | (2003) Concrete Aggregates |
NATIONAL TERRAZZO & MOSAIC ASSOCIATION (NTMA) |
|
NTMA Info Guide | | (2000) Terrazzo Information Guide |
1.2 SUBMITTALS
NOTE: Review submittal description (SD) definitions in Section 01 33 00 SUBMITTAL
PROCEDURES and edit the following list to reflect only the submittals required
for the project. Submittals should be kept to the minimum required for adequate
quality control.
A “G” following a submittal item indicates that the submittal requires Government
approval. Some submittals are already marked with a “G”. Only delete an existing
“G” if the submittal item is not complex and can be reviewed through the Contractor’s
Quality Control system. Only add a “G” if the submittal is sufficiently important
or complex in context of the project.
For submittals requiring Government approval on Army projects, a code of up
to three characters within the submittal tags may be used following the "G"
designation to indicate the approving authority. Codes for Army projects using
the Resident Management System (RMS) are: "AE" for Architect-Engineer; "DO"
for District Office (Engineering Division or other organization in the District
Office); "AO" for Area Office; "RO" for Resident Office; and "PO" for Project
Office. Codes following the "G" typically are not used for Navy, Air Force,
and NASA projects.
Choose the first bracketed item for Navy, Air Force and NASA projects, or choose
the second bracketed item for Army projects.
Government approval is required for submittals with a "G" designation; submittals not having a "G" designation
are for [Contractor Quality Control approval.][information only. When used, a designation following the "G"
designation identifies the office that will review the submittal for the Government.] The following shall be
submitted in accordance with Section
01 33 00
01 33 00
01 33 00 SUBMITTAL PROCEDURES:
SD-02 Shop Drawings
Installation[; G][; G, [_____]]
Drawings indicating the type, size, and layout of divider strips and control joint strips
and color of floor areas.
SD-04 Samples
Terrazzo Flooring
Divider Strips
Control Joint Strips
Colorants
Two 150 x 150 mm 6 x 6 inch (minimum) samples of each color of terrazzo and two 150 mm 6 inch
lengths of each type divider and control joint strip.
SD-10 Operation and Maintenance Data
Cleaning and Sealing
Maintenance instructions for bonded terrazzo.
1.3 DELIVERY AND STORAGE
Materials shall be delivered in the manufacturer's unopened containers marked with the brand name. Materials
shall be delivered, handled, and stored in accordance with manufacturers instructions in a manner that will prevent
deterioration and contamination.
1.4 ENVIRONMENTAL REQUIREMENTS
Areas to receive terrazzo shall be maintained at a temperature above 10 degrees C 50 degrees F 24 hours prior
to the time mixtures are placed and until completely cured.
1.5 WARRANTY
Manufacturer's standard performance guarantees or warranties that extend beyond a one-year period shall be provided.
PART 2 PRODUCTS
2.1 PORTLAND CEMENT
Portland cement shall conform to
ASTM C 150, Type I, of colors required to match
NTMA Info Guide color plate
indicated [on the drawings] [in Section
09 06 90
09 06 90
09 06 90 COLOR SCHEDULE].
2.2 SAND
Sand shall conform to ASTM C 33 for fine aggregate.
2.3 MARBLE CHIPS
Marble chips shall be of domestic origin of sizes and colors required to match
NTMA Info Guide color plate indicated
[on the drawings] [in Section
09 06 90
09 06 90
09 06 90 COLOR SCHEDULE]. Marble chips shall have an abrasive hardness of not
less than 10 when tested in accordance with
ASTM C 241; shall contain no deleterious or foreign matter; and the
dust content shall be less than one percent by weight.
2.4 DIVIDER STRIPS
NOTE: Manufacturer's literature should be reviewed when making selections for
divider strips. When material and thickness of divider strips and color of
plastic strips vary, depending on location in the project, material thickness
and color should be shown on the drawings and specified.
Divider strips shall be in accordance with
NTMA Info Guide and shall be
30 mm 1-1/4 inch deep, [_____]
mm gauge
thick and of [brass] [zinc] [plastic in color as indicated [on the drawings] [in Section
09 06 90
09 06 90
09 06 90 COLOR SCHEDULE]].
Standard type one-piece divider strips shall [be not lighter than
1.5 mm No. 16 Brown & Sharpe gage thick]
[be of thickness indicated]. Heavy-top strips may be either one- or two-piece strips with a solid top section,
[not less than
6 mm 1/4 inch nor more than
10 mm 3/8 inch in depth and not less than
[3] [6] mm [1/8] [1/4] inch
thick] [of thickness shown].
2.5 CONTROL JOINT STRIPS
NOTE: Manufacturer's literature should be reviewed when making selections for
control joint strips.
Control joint strips shall be in accordance with
NTMA Info Guide and shall be [_____]
mm inches deep, [_____]
mm gauge thick and of [brass] [zinc]. Neoprene filler shall be [_____]
mm inches thick in color as indicated
[on the drawings] [in Section
09 06 90
09 06 90
09 06 90 COLOR SCHEDULE].
2.6 COLORANTS
Colorants shall be alkali-resistant and nonfading. Pigments shall be of colors required to match
NTMA Info Guide
color plate indicated [on the drawings] [in Section
09 06 90
09 06 90
09 06 90 COLOR SCHEDULE].
2.7 CURING MATERIAL
Curing material shall be either liquid membrane-forming compound, wet sand, polyethylene sheeting, or water.
Liquid membrane-forming compound shall conform to ASTM C 309, Type I. Polyethylene sheeting shall conform to
ASTM C 171.
2.8 TERRAZZO CLEANER
Terrazzo cleaner shall be biodegradable, phosphate free and shall have a pH factor between 7 and 10 and be of
a type specially prepared for use on terrazzo.
2.9 SEALER
NOTE: Include bracketed pH factor for WESTNAVFACENGCOM projects only.
Sealer shall [have a pH factor between 7 and 10 and ]be a penetrating type specially prepared for use on terrazzo.
The sealer shall not discolor or amber the terrazzo and shall produce a slip resistant surface. Flash point
of sealer shall be in accordance with NTMA Info Guide.
2.10 SHEET MATERIALS
Sheet materials used for curing the terrazzo shall conform to ASTM C 171.
PART 3 EXECUTION
3.1 TERRAZZO PROPORTIONS
3.1.1 Underbed
Underbed shall be composed of one part portland cement to [4] [4.5] parts sand. Water shall be added to provide
workability at as low a slump as possible. Spread to a level 13 mm 1/2 inch below the finished floor, to a thickness
of approximately 30 mm 1-1/4 inches.
3.1.2 Terrazzo Topping
Topping shall be composed of one 43 kg 94 pound bag of portland cement per 91 kg 200 pounds of marble chips and
approximately 20 L 5 gallons of water. Color pigment shall be added as needed but not to exceed 1 kg 2 pounds
per bag of cement. Water shall be added in sufficient quantity to provide workability at as low a slump as
possible.
3.2 INSTALLATION
3.2.1 Underbed Placement
Surfaces of concrete subfloor shall be cleaned and saturated with water in accordance with NTMA Info Guide.
Do not treat concrete substrate to receive bonded terrazzo with curing agent or additives which would preclude
bonding. Excess water shall be removed from the subfloor before slushing and brooming with neat cement paste.
The underbed shall be placed on the concrete subfloor and shall be screeded to an elevation 13 mm 1/2 inch below
the finished floor. Divider strips shall be installed in the semiplastic underbed. The underbed shall be firmly
troweled along the edges to insure positive anchorage of the divider strips. Control joint strips shall be installed
over subfloor expansion joints and shall extend the full depth of the underbed.
3.2.2 Setting Divider Strips
Set in accordance with layout indicated while underbed is still plastic. Set strips to straight lines and to
the proper level to ensure that tops of strips will show uniformly after completing grinding and finishing operations.
Fit joints and intersections tight. Where divisions in field work are not shown, divide field work into squares
or rectangles of uniform size and not more than 1800 mm 6 feet on a side. Divide borders by strips to coincide
with the layout of division strips in the field of floors. Place edging strips at doorways between terrazzo
and other types of flooring and along the edges of terrazzo borders adjoining other types of floor finishes or
floor coverings. Place expansion strips over control joints, construction joints, and expansion joints.
3.2.3 Placing Terrazzo Topping
The underbed shall be slushed and broomed in accordance with NTMA Info Guide with neat cement paste of the same
color as required for the topping. The topping shall be placed in panels formed by divider strips and shall
be troweled level with the top of the strips. The troweled surface shall be seeded with chips in the same color
proportions as contained in the terrazzo mix, troweled and rolled with heavy rollers until excess water has been
extracted. The terrazzo shall be troweled to a uniform surface disclosing the lines of the divider strips.
3.2.4 Curing
The terrazzo shall be cured until the topping develops sufficient strength to prevent lifting or pulling of terrazzo
chips during grinding. Keep the completed terrazzo continuously moist and free of traffic during the curing
period. Cure by covering with a liquid membrane-forming compound, sheet materials, wet sand, or sprinkling with
water.
3.2.5 Finishing
[Finishing shall be in accordance with NTMA Info Guide.] [After curing the grout coat for a minimum of 72 hours,
grind the floor using a No. 80 or finer grit stone. In the latter stages of grinding, use grit stones or other
abrasive in the grinding machine of a grain or fineness that will give the surface a honed finish. Grind and
rub by hand small areas, inaccessible portions, and corners that cannot be reached by the grinding 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/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 --