HomeMy WebLinkAbout03 30 05CORNELL DIVISION 3 - CONCRETE
Ithaca, New York SECTION 03 30 05 - CONCRETE SLAB ON GRADE
CLARA DICKSON HALL CONCRETE SLAB ON GRADE 03 30 05 - 1
WASTE & STORM LINE REPLACEMENT DECEMBER 31, 2014
SECTION 03 30 05 - CONCRETE SLAB ON GRADE
1.0 GENERAL
1.1 SUMMARY
A.Section includes cast-in-place concrete to fill sawcut floor openings in existing slab on grade floors.
1.2 SUBMITTALS
A.Product Data: For each type of product indicated.
B.Design Mixtures: For each concrete mixture.
C.Steel Reinforcement: Placing drawings that detail fabrication and placement.
1.3 INFORMATIONAL SUBMITTALS
A.Qu al if ic at io n D at a: Fo r In st al le r, ma nu fa cu re r a nd te st in g a ge nc y.
B.Material Certificates: For each of the following, signed by manufacturers:
1.Cementitious materials.
2.Admixtures.
3.Form materials and form-release agents.
4.Steel reinforcement and accessories.
5.Curing compounds.
6.Bonding agents.
7.Vapor retarders.
8.Joint-filler strips.
9.Repair materials.
C.Material Test Reports: For the following, from a qualified testing agency, indicating compliance with
requirements.
1.Aggregates. Include service record data indicating absence of deleterious expansion of concrete
du e t o a lk al i a ggr eg at e r ea ct iv it y.
2.Field quality-control reports.
1.4 QUALITY ASSURANCE
A.Installer Qualifications: A qualified installer who emplys on Project personnel qualified as ACI-certified
Flatwork Technician and Finisher and a supervisor who is an ACI-certified Concrete Flatwork
Technician.
CORNELL DIVISION 3 - CONCRETE
Ithaca, New York SECTION 03 30 05 - CONCRETE SLAB ON GRADE
CLARA DICKSON HALL CONCRETE SLAB ON GRADE 03 30 05 - 2
WASTE & STORM LINE REPLACEMENT DECEMBER 31, 2014
B.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.
1.Manufacturer certified according to NRMCA's "Certification of Ready Mixed Concrete
Productio n Facilitie s".
C.Testing Agency Qualifications: An independent agency, qualified according to ASTM C 1077 and
ASTM E 329 for testing indicated.
1.Personnel conducting field tests shall be qualified as ACI Concrete Field Testing Technician,
Grade 1, according to ACI CP-1 or an equivalent certification program.
2.Personnel preforming laboratory tests shall be ACI-certified Concrete Strength Testing
Technician and Concrete Laboratory Testing Technician - Grade I. Testing Agency laboratory
sha ll be a n AC I-ce rti fie d C onc ret e Lab ora to ry Te st in g Te chn ici an - Gra de II.
D.Source Limitations: Obtain each type or class of cementitious material of the same brand from the same
manufacturer's plant, obtain aggregate from single source, and obtain admixtures from single source
from single manufacturer.
E.ACI Publications: Comply with the following unless modified by requirements in the Contract
Documents.
1.ACI 301, "Specifications for Structural Concrete", Sections 1 through 5.
2.ACI 117, "Specifi cations for T olerances for C oncrete Cons truction an d Materials ".
F.Concrete testing Service: Engage a qualified independent testing agency to perform material evaluation
test and to design concrete mixtures.
G.Preinstallation Conference: Conduct conference at Project site.
1.Before submitting design mixtures, review concrete design mixture and examine procedures for
ensuring quality of concrete materials. Require representatives of each entity directly concerned
with cast-in-pl ace con crete t o atte nd, i nclud ing th e foll owing:
a.Contractor's superintendent.
b.Independent testing agency responsible for concrete design mixtures.
c.Ready-mix concrete manufacturer.
d.Concrete subcontractor.
2.Review testing and inspecting agency procedures for field quality control, concrete finishes and
finishing, cold- and hot-weather concreting procedures, curing procedures, joint-filler strips,
forms and form removal limitations, shoring and reshoring procedures, vapor-retarder
installation, anchor rod and anchorage device installation tolerances, steel reinforcement
installation, concrete repair procedures, and concrete protection.
CORNELL DIVISION 3 - CONCRETE
Ithaca, New York SECTION 03 30 05 - CONCRETE SLAB ON GRADE
CLARA DICKSON HALL CONCRETE SLAB ON GRADE 03 30 05 - 3
WASTE & STORM LINE REPLACEMENT DECEMBER 31, 2014
1.5 DELIVERY, STORAGE, AND HANDLING
1.Steel Reinforcement: Deliver, store, and handle steel reinforcement to prevent bending and
damage.
2.0 PRODUCTS
2.1 STEEL REINFORCEMENT
A.Reinforcing Bars: ASTM A 615/A 615M, Grade 60 (Grade 420), deformed.
B.Plain-Steel Wire: ASTM A 82/A 82M, as drawn.
2.2 REINFORCEMENT ACCESSORIES
A.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", of greater compressive
strength than concrete.
2.3 CONCRETE MATEIRALS
A.Cementitious Material: Use the following cementitious materials, of the same type, brand, and source,
throughout the Project:
1.Po rtl and Cem ent : AS TM C 150 , Typ e I/II.
B.Normal-Weight Aggregates: ASTM C33, Class 3S coarse aggregate or better, graded. Provide
aggregates from a single source with documented service record data of at least 10 years satisfactory
service in similar applications and service conditions using similar aggregates and cementitious
materials.
1.Maximum Coarse-Aggregate Size:
a.Slabs-on-Grade: 1 inch nominal.
2.Coarse aggregate shall be crushed limestone.
3.Fine Aggregate: Free of materials with deleterious reactivity to alkali in cement.
C.Water: ASTM C94/C 94M and potable.
2.4 ADMIXTURES
A.Air-Entraining Admixture: Not required or desired.
CORNELL DIVISION 3 - CONCRETE
Ithaca, New York SECTION 03 30 05 - CONCRETE SLAB ON GRADE
CLARA DICKSON HALL CONCRETE SLAB ON GRADE 03 30 05 - 4
WASTE & STORM LINE REPLACEMENT DECEMBER 31, 2014
B.Chemical Admixtures: Provide admixtures certified by manufacturer to be compatible with other
admixtures and that will 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 Adm ixture: ASTM C 494 /C 494M, T ype B.
3.Water-Reducing and Retarding Admixture: ASTM C 494/C 494M, Type D.
4.High-Range, Wat er-Reducing Adm ixture: ASTM C 494 /C 494M, T ype F.
5.High-Range, Water-Reducing and Retarding Admixture: ASTM C494/C 494M, Type G.
6.Pl asi ti ciz in g an d R eta rdi ng A dm ix tu re: AS TM C 101 7/C 1 017 M, T ype II.
2.5 VAPOR RETARDERS
A.Sheet Vapor Retarder: ASTM E 1745, Class A. Include manufacturer's recommended adhesive or
pressure-sensitive tape.
1.Products: Subject to compliance with requirements, available products that may be incorporated
into the W ork in clude , but are not limi ted to , the f ollo wing:
a.Fortifiber Building Systems Group; Moistop Ultra 15,10.
b.Grace Construction Products, W. R. Grace & com; Florprufe 120.
c.Meadows, W. R., Inc.; Perminator 15 mil.
d.Raven Industries Inc.; Vapor Block 15.
e.Reef Industries, Inc.; Griffolyn Type-105.
f.Stego Industries, Llc; Stego Wrat 15 mil Class A.
2.6 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, weighting
ap pr ox im at el y 9 o x./s q. yd. (3 05 g/sq . m ) w he n d ry.
C.Moisture-retaining Cover: ASTM C 171, polyethylene film or white burlap-polyethylene sheet.
D.Water: Potable.
E.Clear , wate rborn e, Mem brane-formi ng Curi ng Com pound : AST M C 30 9, Type 1, Clas s B, di ssip ating.
2.7 RELATED MATERIALS
A.Expansion- and Isolation-Joint-Filler Strips: ASTM D 1751, asphalt-saturated cellulosic fiber or
cellulosic fiber or ASTM D1752, cork or self-expanding cork.
CORNELL DIVISION 3 - CONCRETE
Ithaca, New York SECTION 03 30 05 - CONCRETE SLAB ON GRADE
CLARA DICKSON HALL CONCRETE SLAB ON GRADE 03 30 05 - 5
WASTE & STORM LINE REPLACEMENT DECEMBER 31, 2014
B.Bonding Agent: ASTM C 1059/C 1059M, Type II, non-redispersible, acrylic emulsion or styrene
butadiene.
2.8 REPAIR MATERIALS
A.Repair Overlayment: Cement-based, polymer-modified, self-leveling product that can be applied in
thickness from 1/4 inch (6.4 mm) and that can be filled in over a scarified surface to match adjacent
floor elevations.
1.Cement Binder: ASTM C 150, portland cement or hydraulic or blended hydraulic cement as
defined in ASTM C 219.
2.Primer: Product of topping manufacturer recommended for substrate, conditions and application.
3.Aggregate: Well-graded, washed gravel, 1/8 to 1/4 inch (3.2 to 6 mm) or coarse sand as
recommended to topping manufacturer.
4.Compressive Strength: Not less than 5000psi (34.5 Mpa) at 28 days when tested according to
ASTM C 109/C 109M.
2.9 CONCRETE MIXTURES, GENERAL
A.Prepare desing 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.
1.Use a qualified independent testing agency for preparing and reporting proposed mixture designs
based on laboratory trial mixtures.
B.Limit water-soluble, chloride-ion content in hardened concrete to 0/30 percent by weight of cement.
C.Admixtures: Use admixture according to manufacturer's written instructions.
1.Use water-reducing high-range water-reducing or plasticizing admixture in concrete, as required,
fo r p la ce me nt an d w or ka bi li ty.
2.Us e w at er -r ed uc in g a nd re ta rd in g a dm ix tu re wh en re qu ir ed by h ig h t em pe ra tu re s, lo w h um id it y,
or other adverse placement conditions.
3.Use water-reducing admixture in pumped concrete, concrete required to be watertight, and
concrete with a water-cementitious materials ratio below 0.50.
2.10 CONCRETE MIXTURES FOR BUILDING ELEMENTS
A.Slabs-on-Grade: Proportion normal-weight concrete mixture as follows:
1.Minimum Compressive Strength: 400 psi (27.6 Mpa) at 28 days.
2.Minimum Cementitious Materials Content: 470 lb/cu. yd. (279 kg/cu. m).
3.Slump Limit: 8 inches (200 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, ± 1 inch (25
mm).
CORNELL DIVISION 3 - CONCRETE
Ithaca, New York SECTION 03 30 05 - CONCRETE SLAB ON GRADE
CLARA DICKSON HALL CONCRETE SLAB ON GRADE 03 30 05 - 6
WASTE & STORM LINE REPLACEMENT DECEMBER 31, 2014
4.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 C RSI's "Manual of St andard Practi ce".
2.12 CONCRETE MIXING
A.Ready-Mixed Concrete: Measure, batch, mix, and deliver concrete according to ASTM C94/C 94M and
ASTM C 1116/C 1116M, and furnish batch ticket information.
1.Whend air temperature is between 85°F and 90°F (30°C and 32°C), reduce mixing and delivery
time from 1-1/2 hours to 75 minutes; when air temperature is above 90°F (32°C), reduce mixing
and delivery time to 60 minutes.
B.Project-Site Mixing: Measure, batch, and mix concrete materials and concrete according to ASTM C
94/C 94M. Mix concrete materials in appropriate drum-type batch machine mixer.
1.For mixer capacity of 1 cu. yd. (o.76 cu. m) or smaller, continue mixing at least 1-1/2 minutes,
but not more than 5 minutes after ingredients are in mixer, before any part of batch is released.
2.For mixer capacity larger than 10 cu. yd. (0.76 cu. m), increase mixing time by 15 seconds for
each additional 1 cu. yd. (0.76 cu. m).
3.Provide batch ticket for each batch discharged and used in the Work, indicating Project
identification name and number, date, mixture type, mixture time, quantity, and amount of water
added. Record approximate location of final deposit in structure.
3.0 EXECUTION
3.1 VAPOR RETARDERS
A.Sheet Vapor Retarders: Place, protect, and repair sheet vapor retarder according to ASTM E 1643 and
manufacturer's written instructions.
1.Lap joints 6 inches (150 mm) and seal with manufacturer's recommended tape.
3.2 STEEL REINFORCEMENT
A.General: Comply with CRSI's "Manual of Standard Practice" for placing reinforcement.
1.Do not cut or puncture vapor retarder. Repair damage and reseal vapor retarder before placing
concrete.
B.Clean reinforcement of loose rust and mill scale, earth, ice, and other foreign materials that would reduce
bond to concrete.
CORNELL DIVISION 3 - CONCRETE
Ithaca, New York SECTION 03 30 05 - CONCRETE SLAB ON GRADE
CLARA DICKSON HALL CONCRETE SLAB ON GRADE 03 30 05 - 7
WASTE & STORM LINE REPLACEMENT DECEMBER 31, 2014
C.Accurately position, support, and secure reinforcement against displacement. Locate and support
reinforcement with bar supports to maintain concrete cover. Do not tack weld crossing reinforcing bars.
D.Set wire ties with ends directed into concrete, not toward exposed concrete surfaces.
E.Install welded wire reinforcement in longest practicable lengths on bar supports spaced to minimize
sagging. Lap edges and ends of adjoining sheets at least one mesh spacing. Offset laps of adjoining sheet
widths to prevent continuous labps in either direction. Lace overlaps with wire.
3.3 JOINTS
A.General: Construct joints true to line with faces perpendicular to surface plane of concrete.
B.Isolation Joints in Slabs-on-Grade: After removing formwark, install joint-filler strips at slab junctions
with vertical surfaces, such as column pedestals, foundation walls, grade beams and other locations, as
indicated.
1.Extend joint-filler strips full width and depth of joint, terminating flush with finished concrete
surface unless otherwise indicated.
2.Install joint-filler strips in lengths as long as practicable. Where more than one length is required,
lace or clip sections together.
3.4 CONCRETE PLACEMENT
A.Before placing concrete, verity that installation of formwork, reinforment, and embedded items is
complete and that required inspections have been performed.
B.Do not add water to concrete during delivery, at Project site, or during placement unless approved by
Architect/Engineer.
C.Before test sampling and placing concrete, water may be added at Project site, subject to limitations of
ACI 301.
1.Do not add water to concrete after adding high-range water-reducing admixtures to mixture.
D.Deposit and consolidate concrete for floors and slabs in a continuous operations, within limits of
construction joints, until placement of a panel or section is complete.
1.Consolidate concrete during placement operations so concrete is thoroughly worked around
reinforcement and other embedded items and into corners.
2.Maintain reinforcement in position on chairs during concrete placement.
3.Screed slab surfaces with a straightedge and strike off to correct elevations.
4.Slope surfaces uniformly to drains where required.
CORNELL DIVISION 3 - CONCRETE
Ithaca, New York SECTION 03 30 05 - CONCRETE SLAB ON GRADE
CLARA DICKSON HALL CONCRETE SLAB ON GRADE 03 30 05 - 8
WASTE & STORM LINE REPLACEMENT DECEMBER 31, 2014
5.Begin initial floating using bull floats or darbies to form a uniform and open-textured surface
plane, before excess bleedwater appears on the surface. Do not further disturb slab surfaces
before starting finishing operations.
E.Hot-Weather Placement: Comply with ACI 301 and as follows:
1.Maintain concrete temperature below 90°F (32°C) at time of placement. Chilled mixing water or
chopped ice may be used to control temperature, provided water equivalent of ice is calculated to
total amount of mixing water. Using liquid nitrogen to cool concrete is Contractor's option.
2.Fog-spray forms, steel reinforcement, and subgrade just before placing concrete. Keep subgrade
uniformly moist without standing water, soft spots, or dry areas.
3.5 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.
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
directions.
1.Apply scratch finish to surfaces to receive mortar setting beds for bonded cementitious floor
finishes.
C.Float Finishes: 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.
D.Trowel Finish: After applying float finish, apply first troweling and consolidate concrete by hand or
power-driven trowel. Continue troweling passes and restraightening until surface is free of trowel marks
and un iform in tex ture an d appe arance. Grind smoo th any sur face def ects t hat wo uld t elegrap h thro ugh
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 foot (3.05 m) long straightedge resting on tow high spots and placed anywhere
on the surface does not exceed 1/8 inch (3.2 mm).
CORNELL DIVISION 3 - CONCRETE
Ithaca, New York SECTION 03 30 05 - CONCRETE SLAB ON GRADE
CLARA DICKSON HALL CONCRETE SLAB ON GRADE 03 30 05 - 9
WASTE & STORM LINE REPLACEMENT DECEMBER 31, 2014
3.6 MISCELLANEOUS CONCRETE ITEMS
A.Filling In: Fill in holes and openings left in concrete structures after work of other trades in place unless
otherwise indicated. Mix, place, and cure concrete, as specified, to blend with in-place construction.
Provide other miscellaneous concrete filling indicated or required to complete Work.
3.7 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 for hot-weather protection during
curin g.
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
float ing or d arbying con crete, but b efore f loat f inis hing.
C.Formed Surfaces: Cure formed concrete surfaces, including underside of beams, supported slabs, and
ot her si mi lar sur fac es. If fo rms rem ain dur in g cu rin g pe rio d, m oi st cur e af ter lo ose ni ng f orm s. If
removing forms before end of curing period, continue curing for the remainder of the curing period.
D.Unformed surfaces: Begin curing immediately after finishing concrete. Cure unformed surfaces,
including floors and slabs, concrete floor toppings, and other surfaces.
E. 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 7 days with the following
materials:
a.Water.
b.Co nt in uo us wa te r-fo g s pr ay.
c.Absorptive cover, water saturated, and kept continuously wet. Cover concrete surfaces
and edges with 12 inch (300 mm) lap over adjacent absorptive covers.
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 of adhesive. Cure for not less than 7 days. Immediately
repair any holes or tears during curing period using cover material and waterproof tape.
a.Moisture cure or use moisture-curing covers to cure concrete surfaces to receive floor
coverings.
b.Cure concrete surfaces to receive floor coverings with either a moisture-retaining cover or
a curing compound that the manufacturer certifies will not interfere with bonding of floor
covering used on Project.
CORNELL DIVISION 3 - CONCRETE
Ithaca, New York SECTION 03 30 05 - CONCRETE SLAB ON GRADE
CLARA DICKSON HALL CONCRETE SLAB ON GRADE 03 30 05 - 10
WASTE & STORM LINE REPLACEMENT DECEMBER 31, 2014
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 3 hours
after initial application. Maintain continuity of coating ad repair damage during curing period.
a.Removal: Aflter curing period has elapsed, remove curing compound without damaging
concrete surfaces by method recommended by curing compound manufacturer unless
manufacturer certifies curing compound will not interfere with bond of floor covering
used on Project.
3.8 CONCRETE SURFACE REPAIRS
A.Defective Concrete: Repair and patch defective areas when approved by Architect/Engineer. Remove
and replace concrete that cannot be repaired and patched to Architect/Engineer approval.
B.Patching Mortar: Mix dry-pack patching mortar, consisting of one part portland cement to 2-1/2 parts
fine aggr egate pa ssin g a No. 1 5 (1.1 8 mm) s ieve u sing o nly enough water f or han dlin g and pl acing.
C.Repairing Unformed Surfaces: Test unformed surfaces, such as floors and slabs, for finish and verify
surface tolerances specified for each surface. Correct low and high areas. Test surfaces sloped to drain
for trueness of slope and smoothness; use a sloped template.
1.Repair finished surfaces containing defects. Surface defects include spalls, popouts, honeycombs,
rock pockets, crazing and cracks in excess of 0.01 inch (0.25 mm) wide or that penetrate to
reinforcement of completely through unreinforced sections regardless of width, and other
objectionable conditions.
2.After c oncret e has cu red at l east 1 4 days, co rrect h igh area s by grindi ng.
3.Correct localized low areas during or immediately after completing surface finishing operations
by cutting out low areas and replacing with patching mortar. Finish repaired areas to blend into
adjacent concrete.
4.Correct other low areas scheduled to receive floor coverings with a repair underlayment. Prepare,
mix, and apply repair underlayment and primer according to manufacturer's written instructions
to produce a smooth, uniform plane, and level surface. Feather edges to match adjacent floor
elevattions.
5.Correct other low areas scheduled to remain exposed with a repair topping. Cut out low areas to
ensure a minimum repair topping depth of 1/4 inch (6 mm) to match adjacent floor elevations.
Prepare, mix, and apply repair topping and primer according to manufacturer’s written
instructions to produce a smooth, uniform, plane, and level surface.
6.Repair defective areas, except random cracks and single holes 1 inch (25 mm) or less in
diameter, by cutting out and replacing with fresh concrete. Remove defective areas with clean,
square cuts and expose steel reinforcement with at least a 3/4-inch (19-mm) clearance all around.
Dampen concrete surfaces in contact with patching concrete and apply bonding agent. Mix
patching concrete of same materials and mixture as original concrete except without coarse
aggregate. Place, compact, and finish to blend with adjacent finished concrete. Cure in same
manner as adjacent concrete.
CORNELL DIVISION 3 - CONCRETE
Ithaca, New York SECTION 03 30 05 - CONCRETE SLAB ON GRADE
CLARA DICKSON HALL CONCRETE SLAB ON GRADE 03 30 05 - 11
WASTE & STORM LINE REPLACEMENT DECEMBER 31, 2014
7.Repair random cracks and single holes 1 inch (25 mm) or less in diameter with patching mortar.
Groove top of cracks and cut out holes to sound concrete and clean off dust, dirt, and loose
particles. Dampen cleaned concrete surfaces and apply bonding agent. Place patching mortar
before bonding agent has dried. Compact patching mortar and finish to match adjacent concrete.
Keep patched area continuously moist for at least 72 hours.
D.Perform structural repairs of concrete, subject to Architect’s approval, using epoxy adhesive and
patching mortar.
E.Repair materials and installation not specified above may be used, subject to Architect’s approval.
3.9 FIELD QUALITY CONTROL
A.Testing and Inspecting: Owner will engage a qualified testing and inspecting agency to perform field
tests and inspections and prepare test reports.
B.Inspections:
1.Steel reinforcement placement.
2.Verification of use of required design mixture.
3.Concr ete pl acemen t, in cludi ng conv eying and d eposi ting.
4.Curing procedures and maintenance of curing temperature.
C.Concrete Tests: Testing of composite samples of fresh concrete obtained according to ASTM C 172
shall be performed according to the following requirements:
1.Testing Frequency: Obtain one composite sample for each day’s pour of each concrete mixture
exceeding 5 cu. yd. (4 cu. m), but less than 25 cu. yd. (19 cu. m), plus one set for each additional
50 cu. yd. (38 cu. m) or fraction thereof.
a.When frequency of testing will provide fewer than five compressive strength tests for
each concrete mixture, testing shall be conducted from at least five randomly selected
batches or from each batch if fewer than five are used.
2.Slump: ASTM C 143/C 143M; one test at point of placement for each composite sample, but not
less than one test for each day’s pour of each concrete mixture. Perform additional tests when
concrete consistency appears to change.
3.Air Content: ASTM C 231, pressure method, for normal-weight concrete; one test for each
composite sample, but not less than one test for each day’s pour of each concrete mixture.
4.Concrete Temperature: ASTM C 1064/C 1064M; one test hourly when air temperature is 40 deg
F (4.4 deg C) and below and when 80 deg F (27 deg C) and above, and one test for each
composite sample.
CORNELL DIVISION 3 - CONCRETE
Ithaca, New York SECTION 03 30 05 - CONCRETE SLAB ON GRADE
CLARA DICKSON HALL CONCRETE SLAB ON GRADE 03 30 05 - 12
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5.Compression Test Specimens: ASTM C 31/C 31M.
a.Cast and laboratory cure two sets of two standard cylinder specimens for each composite
sample.
6.Compressive-Strength Tests: ASTM C 39/C 39M; test one set of two specimens at 7 days and
one set of two specimens at 28 days.
a.A compressive-strength test shall be the average compressive strength from a set of two
specimens obtained from same composite sample and tested at age indicated.
7.Strength of each concrete mixture will be satisfactory if every average of any three consecutive
compressive-strength tests equals or exceeds specified compressive strength and no compressive-
strength test value falls below specified compressive strength by more than 500 psi (3.4 Mpa).
8.Test results shall be reported in writing to Architect, concrete manufacturer, and Contractor
within 48 hours of testing. Reports of compressive-strength tests shall contain Project
identification name and number, date of concrete placement, name of concrete testing and
inspecting agency, location of concrete batch in Work, design compressive strength at 28 days,
concrete mixture proportions and materials, compressive breaking strength, and type of break for
both 7- and 28- day tests.
9.Nondestructive Testing: Impact hammer, sonoscope, or other nondestructive device may be
permitted by Architect but will not be used as sole basis for approval or rejection of concrete.
10.Additional Tests: Testing and inspecting agency shall make additional tests of concrete when test
results indicate that slump, air entrainment, compressive strengths, or other requirements have
not been met, as directed by Architect. Testing and inspecting agency may conduct tests to
determine adequacy of concrete by cored cylinders complying with ASTM C 42/C 42M or by
other methods as directed by Architect.
11.Additional testing and inspecting, at Contractor’s expense, will be performed to determine
compliance of replaced or additional work with specified requirements.
12.Correct deficiencies in the Work that test reports and inspections indicate do not comply with the
Contract Documents.
***END OF SECTION 03 30 05***