HomeMy WebLinkAboutDivision 03 - Concrete.pdfTHE EDUCATION CENTER Project No. 122175.00
AT BETTY FORD ALPINE GARDENS Vail, Colorado
CAST-IN-PLACE CONCRETE 033000 - 1
SECTION 033000 - CAST-IN-PLACE CONCRETE
PART 1 - GENERAL
1.1 SUMMARY
A. Section includes cast-in-place concrete, including formwork, reinforcement, concrete materials,
mixture design, placement procedures, and finishes.
B. Section also includes colored, decorative, rough-formed (board-formed) concrete.
C. Related Requirements:
1. Section 312000 "Earth Moving" for drainage fill under slabs-on-grade.
1.2 ACTION SUBMITTALS
A. Product Data: For each type of product.
B. Design Mixtures: For each concrete mixture.
C. Steel Reinforcement Shop Drawings: Placing Drawings that detail fabrication, bending, and
placement.
1.3 INFORMATIONAL SUBMITTALS
A. Material certificates.
B. Material test reports.
C. Formwork Shop Drawings: Prepared by or under the supervision of a qualified professional
engineer, detailing fabrication, assembly, and support of formwork.
D. Decorative forms for rough-formed (board-formed) concrete.
E. Concrete color samples.
F. Floor surface flatness and levelness measurements indicating compliance with specified
tolerances.
1.4 QUALITY ASSURANCE
A. Manufacturer Qualifications: A firm experienced in manufacturing ready-mixed concrete
products and that complies with ASTM C 94/C 94M requirements for production facilities and
equipment.
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AT BETTY FORD ALPINE GARDENS Vail, Colorado
CAST-IN-PLACE CONCRETE 033000 - 2
1. Manufacturer certified according to NRMCA's "Certification of Ready Mixed Concrete
Production Facilities."
B. Testing Agency Qualifications: An independent agency, acceptable to authorities having
jurisdiction, qualified according to ASTM C 1077 and ASTM E 329 for testing indicated.
1.5 PRECONSTRUCTION TESTING
A. Preconstruction Testing Service: Engage a qualified testing agency to perform preconstruction
testing on concrete mixtures.
1.6 FIELD CONDITIONS
A. Cold-Weather Placement: Comply with ACI 306.1.
1. Do not use calcium chloride, salt, or other materials containing antifreeze agents or
chemical accelerators unless otherwise specified and approved in mixture designs.
B. Hot-Weather Placement: Comply with ACI 301.
PART 2 - PRODUCTS
2.1 CONCRETE, GENERAL
A. ACI Publications: Comply with the following unless modified by requirements in the Contract
Documents:
1. ACI 301.
2. ACI 117.
2.2 FORM-FACING MATERIALS
A. Smooth-Formed Finished Concrete: Form-facing panels that provide continuous, true, and
smooth concrete surfaces. Furnish in largest practicable sizes to minimize number of joints.
B. Rough-Formed Finished Concrete: Lumber, decorative liner, or another approved material.
Provide lumber dressed on at least two edges and one side for tight fit.
2.3 STEEL REINFORCEMENT
A. Reinforcing Bars: ASTM A 615/A 615M, Grade 60, deformed.
B. Plain-Steel Welded-Wire Reinforcement: ASTM A 1064/A 1064M, plain, fabricated from as-
drawn steel wire into flat sheets.
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CAST-IN-PLACE CONCRETE 033000 - 3
C. Bar Supports: Bolsters, chairs, spacers, and other devices for spacing, supporting, and fastening
reinforcing bars and welded-wire reinforcement in place. Manufacture bar supports from steel
wire, plastic, or precast concrete according to CRSI's "Manual of Standard Practice."
2.4 CONCRETE MATERIALS
A. Cementitious Materials:
1. Portland Cement: ASTM C 150/C 150M, [Type I/II], [gray].
2. Fly Ash: ASTM C 618, [Class F].
3. Slag Cement: ASTM C 989/C 989M, Grade 100 or 120.
4. Blended Hydraulic Cement: ASTM C 595/C 595M, [Type IS, portland blast-furnace
slag] cement.
B. Normal-Weight Aggregates: ASTM C 33/C 33M, graded.
1. Maximum Coarse-Aggregate Size: 3/4 inch (19 mm) nominal.
2. Fine Aggregate: Free of materials with deleterious reactivity to alkali in cement.
C. Air-Entraining Admixture: ASTM C 260/C 260M.
D. Chemical Admixtures: Certified by manufacturer to be compatible with other admixtures and
that do not contribute water-soluble chloride ions exceeding those permitted in hardened
concrete. Do not use calcium chloride or admixtures containing calcium chloride.
1. Water-Reducing Admixture: ASTM C 494/C 494M, Type A.
2. Retarding Admixture: ASTM C 494/C 494M, Type B.
3. Water-Reducing and Retarding Admixture: ASTM C 494/C 494M, Type D.
4. High-Range, Water-Reducing Admixture: ASTM C 494/C 494M, Type F.
5. High-Range, Water-Reducing and Retarding Admixture: ASTM C 494/C 494M, Type G.
6. Plasticizing and Retarding Admixture: ASTM C 1017/C 1017M, Type II.
E. Water: ASTM C 94/C 94M and potable.
2.5 WATERSTOPS
A. Flexible Rubber Waterstops: CE CRD-C 513, with factory-installed metal eyelets, for
embedding in concrete to prevent passage of fluids through joints. Factory fabricate corners,
intersections, and directional changes.
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2.6 VAPOR RETARDERS
A. Sheet Vapor Retarder: ASTM E 1745, Class A. Include manufacturer's recommended adhesive
or pressure-sensitive tape.
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AT BETTY FORD ALPINE GARDENS Vail, Colorado
CAST-IN-PLACE CONCRETE 033000 - 4
B. Sheet Vapor Retarder: Polyethylene sheet, ASTM D 4397, not less than 10 mils (0.25 mm)
thick.
2.7 CURING MATERIALS
A. Evaporation Retarder: Waterborne, monomolecular film forming, manufactured for application
to fresh concrete.
B. Absorptive Cover: AASHTO M 182, Class 2, burlap cloth made from jute or kenaf, weighing
approximately 9 oz./sq. yd. (305 g/sq. m) when dry.
C. Moisture-Retaining Cover: ASTM C 171, polyethylene film or white burlap-polyethylene sheet.
D. Water: Potable.
E. Clear, Waterborne, Membrane-Forming Curing Compound: ASTM C 309, Type 1, Class B,
dissipating.
F. Clear, Waterborne, Membrane-Forming Curing and Sealing Compound: ASTM C 1315,
Type 1, Class A.
2.8 RELATED MATERIALS
A. Expansion- and Isolation-Joint-Filler Strips: ASTM D 1751, asphalt-saturated cellulosic fiber or
ASTM D 1752, cork or self-expanding cork.
2.9 CONCRETE MIXTURES, GENERAL
A. Prepare design mixtures for each type and strength of concrete, proportioned on the basis of
laboratory trial mixture or field test data, or both, according to ACI 301 (ACI 301M).
B. Cementitious Materials: Use fly ash, pozzolan, slag cement, and silica fume as needed to reduce
the total amount of portland cement, which would otherwise be used, by not more than 20
percent.
C. Admixtures: Use admixtures according to manufacturer's written instructions.
1. Use water-reducing, high-range water-reducing or plasticizing admixture in concrete, as
required, for placement and workability.
2. Use water-reducing and -retarding admixture when required by high temperatures, low
humidity, or other adverse placement conditions.
3. Use water-reducing admixture in pumped concrete, concrete for heavy-use industrial
slabs and parking structure slabs, concrete required to be watertight, and concrete with a
w/c ratio below 0.50.
2.10 CONCRETE MIXTURES FOR BUILDING ELEMENTS
A. Normal-Weight Concrete:
THE EDUCATION CENTER Project No. 122175.00
AT BETTY FORD ALPINE GARDENS Vail, Colorado
CAST-IN-PLACE CONCRETE 033000 - 5
1. Minimum Compressive Strength: As indicated at 28 days.
2. Maximum W/C Ratio: As indicated.
3. Slump Limit: 4 inches (100 mm) for concrete with verified slump of 2 to 4 inches (50 to
100 mm) before adding high-range water-reducing admixture or plasticizing admixture,
plus or minus 1 inch (25 mm).
4. Air Content: 6 percent, plus or minus 1 percent at point of delivery for 3/4-inch (19-mm)
nominal maximum aggregate size at exterior concrete.
5. Air Content: Do not allow air content of trowel-finished floors to exceed 3 percent.
2.11 FABRICATING REINFORCEMENT
A. Fabricate steel reinforcement according to CRSI's "Manual of Standard Practice."
2.12 CONCRETE MIXING
A. Ready-Mixed Concrete: Measure, batch, mix, and deliver concrete according to
ASTM C 94/C 94M, and furnish batch ticket information.
1. When air temperature is between 85 and 90 deg F (30 and 32 deg C), reduce mixing and
delivery time from 1-1/2 hours to 75 minutes; when air temperature is above 90 deg F (32
deg C), reduce mixing and delivery time to 60 minutes.
PART 3 - EXECUTION
3.1 FORMWORK INSTALLATION
A. Design, erect, shore, brace, and maintain formwork, according to ACI 301 (ACI 301M), to
support vertical, lateral, static, and dynamic loads, and construction loads that might be applied,
until structure can support such loads.
B. Construct formwork so concrete members and structures are of size, shape, alignment,
elevation, and position indicated, within tolerance limits of ACI 117 (ACI 117M).
C. Do not chamfer exterior corners and edges of permanently exposed concrete, unless indicated
otherwise.
3.2 EMBEDDED ITEM INSTALLATION
A. Place and secure anchorage devices and other embedded items required for adjoining work that
is attached to or supported by cast-in-place concrete. Use setting drawings, templates, diagrams,
instructions, and directions furnished with items to be embedded.
3.3 VAPOR-RETARDER INSTALLATION
A. Sheet Vapor Retarders: Place, protect, and repair sheet vapor retarder according to
ASTM E 1643 and manufacturer's written instructions.
THE EDUCATION CENTER Project No. 122175.00
AT BETTY FORD ALPINE GARDENS Vail, Colorado
CAST-IN-PLACE CONCRETE 033000 - 6
1. Lap joints 6 inches (150 mm) and seal with manufacturer's recommended tape.
3.4 STEEL REINFORCEMENT INSTALLATION
A. General: Comply with CRSI's "Manual of Standard Practice" for fabricating, placing, and
supporting reinforcement.
1. Do not cut or puncture vapor retarder. Repair damage and reseal vapor retarder before
placing concrete.
3.5 JOINTS
A. General: Construct joints true to line with faces perpendicular to surface plane of concrete.
B. Construction Joints: Install so strength and appearance of concrete are not impaired, at locations
indicated or as approved by Architect.
C. Contraction Joints in Slabs-on-Grade: Form weakened-plane contraction joints, sectioning
concrete into areas as indicated. Construct contraction joints for a depth equal to at least one-
fourth of concrete thickness as follows:
1. Grooved Joints: Form contraction joints after initial floating by grooving and finishing
each edge of joint to a radius of 1/8 inch (3.2 mm). Repeat grooving of contraction joints
after applying surface finishes. Eliminate groover tool marks on concrete surfaces.
2. Sawed Joints: Form contraction joints with power saws equipped with shatterproof
abrasive or diamond-rimmed blades. Cut 1/8-inch- (3.2-mm-) wide joints into concrete
when cutting action does not tear, abrade, or otherwise damage surface and before
concrete develops random contraction cracks.
D. Isolation Joints in Slabs-on-Grade: After removing formwork, install joint-filler strips at slab
junctions with vertical surfaces, such as column pedestals, foundation walls, grade beams, and
other locations, as indicated.
3.6 WATERSTOP INSTALLATION
A. Waterstops: Install in construction joints and at other locations indicated, according to
manufacturer's written instructions.
3.7 CONCRETE PLACEMENT
A. Before placing concrete, verify that installation of formwork, reinforcement, and embedded
items is complete and that required inspections are completed.
B. Deposit concrete continuously in one layer or in horizontal layers of such thickness that no new
concrete is placed on concrete that has hardened enough to cause seams or planes of weakness.
If a section cannot be placed continuously, provide construction joints as indicated. Deposit
concrete to avoid segregation.
THE EDUCATION CENTER Project No. 122175.00
AT BETTY FORD ALPINE GARDENS Vail, Colorado
CAST-IN-PLACE CONCRETE 033000 - 7
1. Consolidate placed concrete with mechanical vibrating equipment according to ACI 301
(ACI 301M).
3.8 FINISHING FORMED SURFACES
A. Rough-Formed Finish: As-cast concrete texture imparted by form-facing material with tie holes
and defects repaired and patched. Remove fins and other projections that exceed specified limits
on formed-surface irregularities.
1. Apply to concrete surfaces exposed to public view.
B. Smooth-Formed Finish: As-cast concrete texture imparted by form-facing material, arranged in
an orderly and symmetrical manner with a minimum of seams. Repair and patch tie holes and
defects. Remove fins and other projections that exceed specified limits on formed-surface
irregularities.
1. Apply to concrete surfaces exposed to public view, to receive a rubbed finish, or to be
covered with a coating or covering material applied directly to concrete.
C. Rubbed Finish: Apply the following to smooth-formed-finished as-cast concrete where
indicated:
1. Smooth-Rubbed Finish: Not later than one day after form removal, moisten concrete
surfaces and rub with carborundum brick or another abrasive until producing a uniform
color and texture. Do not apply cement grout other than that created by the rubbing
process.
2. Grout-Cleaned Finish: Wet concrete surfaces and apply grout of a consistency of thick
paint to coat surfaces and fill small holes. Mix 1 part portland cement to 1-1/2 parts fine
sand with a 1:1 mixture of bonding admixture and water. Add white portland cement in
amounts determined by trial patches, so color of dry grout matches adjacent surfaces.
Scrub grout into voids and remove excess grout. When grout whitens, rub surface with
clean burlap and keep surface damp by fog spray for at least 36 hours.
3. Cork-Floated Finish: Wet concrete surfaces and apply a stiff grout. Mix 1 part portland
cement and 1 part fine sand with a 1:1 mixture of bonding agent and water. Add white
portland cement in amounts determined by trial patches, so color of dry grout matches
adjacent surfaces. Compress grout into voids by grinding surface. In a swirling motion,
finish surface with a cork float.
D. Related Unformed Surfaces: At tops of walls, horizontal offsets, and similar unformed surfaces
adjacent to formed surfaces, strike off smooth and finish with a texture matching adjacent
formed surfaces. Continue final surface treatment of formed surfaces uniformly across adjacent
unformed surfaces unless otherwise indicated.
3.9 FINISHING FLOORS AND SLABS
A. General: Comply with ACI 302.1R recommendations for screeding, restraightening, and
finishing operations for concrete surfaces. Do not wet concrete surfaces.
THE EDUCATION CENTER Project No. 122175.00
AT BETTY FORD ALPINE GARDENS Vail, Colorado
CAST-IN-PLACE CONCRETE 033000 - 8
B. Scratch Finish: While still plastic, texture concrete surface that has been screeded and bull-
floated or darbied. Use stiff brushes, brooms, or rakes to produce a profile amplitude of 1/4 inch
(6 mm) in one direction.
1. Apply scratch finish to surfaces indicated and to receive concrete floor toppings.
C. Float Finish: Consolidate surface with power-driven floats or by hand floating if area is small or
inaccessible to power-driven floats. Restraighten, cut down high spots, and fill low spots.
Repeat float passes and restraightening until surface is left with a uniform, smooth, granular
texture.
1. Apply float finish to surfaces to receive trowel finish.
D. Trowel Finish: After applying float finish, apply first troweling and consolidate concrete by
hand or power-driven trowel. Continue troweling passes and restraighten until surface is free of
trowel marks and uniform in texture and appearance. Grind smooth any surface defects that
would telegraph through applied coatings or floor coverings.
1. Apply a trowel finish to surfaces exposed to view or to be covered with resilient flooring,
carpet, ceramic or quarry tile set over a cleavage membrane, paint, or another thin-film-
finish coating system.
2. Finish and measure surface, so gap at any point between concrete surface and an
unleveled, freestanding, 10-ft.- (3.05-m-) long straightedge resting on two high spots and
placed anywhere on the surface does not exceed 1/8 inch (3.2 mm).
E. Trowel and Fine-Broom Finish: Apply a first trowel finish to surfaces where ceramic or quarry
tile is to be installed by either thickset or thinset method. While concrete is still plastic, slightly
scarify surface with a fine broom.
1. Comply with flatness and levelness tolerances for trowel-finished floor surfaces.
F. Broom Finish: Apply a broom finish to exterior concrete platforms, steps, ramps, and elsewhere
as indicated.
1. Immediately after float finishing, slightly roughen trafficked surface by brooming with
fiber-bristle broom perpendicular to main traffic route. Coordinate required final finish
with Architect before application.
3.10 CONCRETE PROTECTING AND CURING
A. General: Protect freshly placed concrete from premature drying and excessive cold or hot
temperatures. Comply with ACI 306.1 for cold-weather protection and ACI 301 (ACI 301M)
for hot-weather protection during curing.
B. Evaporation Retarder: Apply evaporation retarder to unformed concrete surfaces if hot, dry, or
windy conditions cause moisture loss approaching 0.2 lb/sq. ft. x h (1 kg/sq. m x h) before and
during finishing operations. Apply according to manufacturer's written instructions after
placing, screeding, and bull floating or darbying concrete, but before float finishing.
THE EDUCATION CENTER Project No. 122175.00
AT BETTY FORD ALPINE GARDENS Vail, Colorado
CAST-IN-PLACE CONCRETE 033000 - 9
C. Formed Surfaces: Cure formed concrete surfaces, including underside of beams, supported
slabs, and other similar surfaces. If forms remain during curing period, moist cure after
loosening forms. If removing forms before end of curing period, continue curing for remainder
of curing period.
D. Cure concrete according to ACI 308.1, by one or a combination of the following methods:
1. Moisture Curing: Keep surfaces continuously moist for not less than seven days.
2. Moisture-Retaining-Cover Curing: Cover concrete surfaces with moisture-retaining cover
for curing concrete, placed in widest practicable width, with sides and ends lapped at
least 12 inches (300 mm), and sealed by waterproof tape or adhesive. Cure for not less
than seven days. Immediately repair any holes or tears during curing period, using cover
material and waterproof tape.
3. Curing Compound: Apply uniformly in continuous operation by power spray or roller
according to manufacturer's written instructions. Recoat areas subjected to heavy rainfall
within three hours after initial application. Maintain continuity of coating and repair
damage during curing period.
a. Removal: After curing period has elapsed, remove curing compound without
damaging concrete surfaces by method recommended by curing compound
manufacturer unless manufacturer certifies curing compound does not interfere
with bonding of floor covering used on Project.
4. Curing and Sealing Compound: Apply uniformly to floors and slabs indicated in a
continuous operation by power spray or roller according to manufacturer's written
instructions. Recoat areas subjected to heavy rainfall within three hours after initial
application. Repeat process 24 hours later and apply a second coat. Maintain continuity
of coating and repair damage during curing period.
3.11 CONCRETE SURFACE REPAIRS
A. Defective Concrete: Repair and patch defective areas when approved by Architect. Remove and
replace concrete that cannot be repaired and patched to Architect's approval.
3.12 FIELD QUALITY CONTROL
A. Special Inspections: Owner will engage a qualified testing and inspecting agency to perform
field tests and inspections and prepare test reports.
END OF SECTION 033000