HomeMy WebLinkAbout71SECTION 03300
CAST -IN-PLACE CONCRETE
PART 1 GENERAL
1.01 RELATED DOCUMENTS
A. Drawings and general provisions of Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this Section.
1.02 SUMMARY
A. Work of this section includes cast -in place concrete, including formwork, reinforcing, mix design, placing, and finishing as shown on the drawings, specified herein or
required to complete the work of this section.
B. Grouting column baseplates
C. Precast concrete specifications are in other Division 3 Sections.
D. Means and methods of construction is solely the responsibility of each subcontractor. The subcontractors shall take all necessary precautions to insure safe working
conditions and provide for the public safety during all stages of their work.
1. Comply with Federal and OSHA regulations as well as local codes, ordinances, and requirements of authorities having jurisdiction.
2. Stabilization or shoring of excavations is the responsibility of the subcontractor. Subcontractor shall provide shoring system adequately designed, anchored and braced
to resist earth and hydrostatic pressures.
1.03 SUBMITTALS
A. General: Submit the following in accordance with Conditions of Contract and Division 1 Specification Sections.
1. Send submittals in time for the engineer to review them prior to start of construction. Schedule must include a minimum of seven working days for the engineer to
review submittals. Add time required to transit submittals from subcontractor to general contractor and from general contractor to the engineer to the seven days.
B. The engineer will not review items relating to means and methods of construction.
C. Product data for proprietary materials and items, including reinforcement and forming accessories, admixtures, patching compounds, waterstops, joint systems, curing
compounds, dry -shake finish materials, and others only if requested by Architect, or Engineer.
1. Certification by manufacturer that products supplied complies with all regulations controlling use of volatile organic compounds (VOC's).
D. Shop drawings for fabrication, bending, and placement of concrete reinforcement: Comply with ACI SP -66 (88), "ACI Detailing Manual," showing bar schedules, stirrup
spacing, diagrams of bent bars, and arrangement of concrete reinforcement. Include special reinforcement required for openings through concrete structures.
E. Mix designs as specified in subsection 2.5.
1. Samples of materials, only when requested by Architect or Engineer
F. Laboratory test reports for concrete materials and mix design test.
G. Materials certificates in lieu of materials laboratory test reports when permitted by Engineer. Manufacturer shall sign material certificates, certifying that each item
complies with specified requirements, including chloride content.
1.04 QUALITY ASSURANCE
A. Codes and Standards: Comply with provisions of following codes, specifications, and standards, except where more stringent requirements are shown or specified:
1. ACI 301 "Specification for Structural Concrete for Buildings"
2. ACI 302.1R "Guide for Concrete Floor and Slab Construction"
3. ACI 304 "Recommended Practice for Measuring, Mixing, Transporting and Placing Concrete"
4. ACI 305 "Hot Weather Concreting"
5. ACI 306 "Cold Weather Concreting"
6. ACI 318, "Building Code Requirements for Structural Concrete"
7. ACI SP -66 "ACI Detailing Manual"
8. Concrete Reinforcing Steel Institute (CRSI), "Manual of Standard Practice"
B. Concrete Testing Service: A material testing laboratory shall perform material evaluation tests including floor slab flatness testing. Refer to Division 1 Specification
Sections.
C. Materials and installed work, which do not conform to the requirements of the contract documents, are not acceptable. Correct or replace at sub -contractors expense.
D. Preconstruction Conference: Before submittal of design mixes, conduct a meeting to review detailed requirements for preparing concrete design mixes and to determine
procedures for satisfactory concrete operations. Review requirements for submittals, status of coordinating work, and availability of materials. Establish preliminary work
progress schedule and procedures for materials inspection, testing, and certifications. Request that representatives of each entity directly concerned with cast -in-place
concrete attend conference, including, but not limited to, the following:
1. General contractor's superintendent
2. Laboratory responsible for concrete design mixes
3. Laboratory responsible for field quality control
4. Ready -mix concrete producer
5. Concrete subcontractor
PART PRODUCTS
2.01 GENERAL
A. Acceptable products include those listed in the following sections.
B. Substitute products may be acceptable. A substitute product must possess the some performance qualities and characteristics as the one specified and fulfill the function
without any decrease in quality, durability or longevity. The substitute product does not need to be identical to the specified product.
C. Substitute products must be reviewed by the engineer.
D. Products shall be VOC compliant when possible. The contractor is responsible for following all federal, state, and local requirements for their use.
2.02 FORM MATERIALS
A. Forms for Exposed Finish Concrete: Plywood, metal, metal -framed plywood faced, or other acceptable panel -type materials, to provide continuous, straight, smooth,
exposed surfaces. Furnish in largest sizes practical to minimize number of joints and to conform to joint system shown on drawings.
1. Use overlaid plywood conforming to US Product Standard PS -1 "A -C or B -B High Density overlaid Concrete Form," Class I.
B. Forms for Unexposed Finish Concrete: Plywood, lumber, metal, or other acceptable material. Provide lumber dressed on at least two edges and one side for tight fit.
C. Forms for Cylindrical Columns, Pedestals, Isolation Joints, and Supports: Metal, fiberglass -reinforced plastic, or paper or fiber tubes. Provide paper or fiber tubes of
laminated plies with water-resistant adhesive and wax -impregnated exterior for weather and moisture protection. Provide units with sufficient wall thickness to resist wet
concrete loads without deformation.
D. Form Release Agent: Provide commercial formulation form -coating compounds with a maximum VOC of 350 mg/I, which will not bond with, stain, or adversely affect
concrete surfaces and will not impair subsequent treatments of concrete surfaces. Release agent shall not contain diesel fuel, kerosene or other similar products.
1. Acceptable products include, but are not limited to the following products:
a) Q -Z Form Release by Unitex
E. Form Ties: Factory -fabricated, adjustable -length, removable or snap -off metal form ties, designed to prevent form deflection and to prevent spilling concrete upon
removal. Provide units that will leave no metal closer than 1 1/2 inches to exposed surface.
2.03 REINFORCING MATERIALS
A. Reinforcing Bars: ASTM A 615, Grade 60, deformed.
1. Refer to drawings for types of reinforcing required.
B. Steel Wire: ASTM A 82, plain, cold -drawn steel
C. Joint dowel bars: ASTM A 615, grade 60, square, plain steel bars.
D. Welded Wire Reinforcement: ASTM A 185, provide reinforcement in flat sheets
E. Supports for Reinforcement: Bolsters, chairs, spacers, and other devices for spacing, supporting, and fastening reinforcing bars fabric in place. Use wire -bar -type
supports complying with CRSI specifications.
1. For exposed -to -view concrete surfaces, where legs of supports are in contact with forms, provide supports with legs that are plastic protected (CRSI, Class 1) or
stainless steel protected (CRSI, Class 2).
2. For slabs on grade, use supports with sand plates or horizontal runners where base material will not support chair legs.
2.04 CONCRETE MATERIALS
A. Portland cement: ASTM C 150, Type I
1. Use one brand of cement throughout project unless otherwise acceptable to Engineer.
B. Slag cement: ASTM C 989
C. Fly Ash: ASTM C 618, Type C or F
D. Normal Weight Aggregates: ASTM C 33 and as herein specified. Provide aggregates from a single source for exposed concrete.
1. For exterior exposed surfaces, do not use fine or coarse aggregates containing substances that cause spilling.
2. Fine aggregate gradation shall meet the following criteria: Total percentage of fine and coarse aggregate retained on any one sieve shall be a minimum of 5% and a
maximum of 20% of the total combined aggregates.
3. Coarse aggregate for footings may use gravel or crushed limestone. See proportioning of mix design for gradations.
4. Coarse aggregate for slab on grade, pavement and sidewalks shall be crushed limestone. See proportioning of mix design for gradations
5. Coarse aggregate for slab on deck shall use gravel. See proportioning of mix design for gradations
E. Water: Potable, and free of substances deleterious to concrete or reinforcement
F. Admixtures, General:
1. Provide admixtures for concrete that contain not more than 0.1 percent chloride ions.
2. Contractor may use admixtures with prior approval of the structural engineer.
G. Air -Entraining Admixture: ASTM C 260, certified by manufacturer to be compatible with other admixtures
H. Water -Reducing Admixtures
1. Only use admixtures that do not increase shrinkage of test specimens
2. Water -Reducing Admixture: ASTM C 494, Type A
3. High -Range Water -Reducing Admixture (Super plasticizers): ASTM C 494, Type F or Type G
4. Water -Reducing, Accelerating Admixture: ASTM C 494, Type E
5. Water -Reducing, Retarding Admixture: ASTM C 494, Type D
2.05 RELATED MATERIALS
A. Stone Base Course: Crushed limestone, when compacted, which provides a smooth and even surface below slabs -on -grade
1. ASTM #57
2.ODOT #304
B. Vapor Barrier/Retarder. See SECTION 07190 - VAPOR BARRIERS for requirements.
1. Concrete contractor shall supply and install the vapor barrier/retarder.
C. Waterstops: Provide WATERSTOP-RX by American Colloid Company. Install per manufacturer's recommendations.
1. RX 101 - For vertical and horizontal applications in concrete 8" or greater thickness
2. RX 102 - For vertical and horizontal applications in concrete 5 to 8" thickness
D. Dowel Sleeves
1. Provide dowel sleeves on one end of each dowel. Sleeve shall accept the size and length of dowels shown on the drawing. Acceptable products include but are n(
limited to:
a) Speed Dowel System by Greenstreak
(1) The Speed Dowel sleeves are available for square and round dowels
b) Round Dowel Cradle by Donley Construction Products (for round dowels)
c) Dowel Master by Donley Construction Products (for square dowels)
2. Diamond Dowel System by Donley Construction Products is an acceptable substitute for the above referenced system. Consult with engineer concerning size and spocin
of plates.
E. Curing, sealing and hardening compound for interior warehouse slabs:
1. Ashford formula
F. Curing compound for interior office floor slabs shall be the fol:owing product or an approved equal:
1. Product Data sheets for the below listed products state they are compatible with a variety of adhesives and can be tiled or carpeted over. Concrete contractor shoul,
consult with the flooring installer to confirm the curing compound is acceptable.
2. When concrete and ambient temperature are above 40 degrees Fahrenheit:
a) Safe Cure & Seal by Dayton Superior
b) Kure -N -Seal W by Sonnebom
c) Kure -N -Seal WB by Sonnebom
3. When concrete or ambient temperatures are expected to be below 40 degrees Fahrenheit during the curing period.
o) Burke Aqua Resin Cure
b) Kure -N -Seal, Sonnebom Building Products
c) Solvent Seal 1315 by Unitex
G. Curing and anti-spalling compound for exterior concrete shall be the following product or an approved equal:
1. Pliocure, Euclid Company.
2. Solvent Seal 1315 by Unitex
3. CS -309-25 by W.R. Meadows
H. Curing compounds for slabs to receive moisture sensitive flooring shall conform to ASTM C1315. Contractor providing and installing the flooring material MUST a rove the
curing compound to be usd on the slab. pp
I. Grout mix for pre -cast concrete panel bases: (where required)
1. Cement: 564 lbs.
2. Sand: 2900 lbs
3. Water 42 gallons
4. Maximum slump: 6 inches
J. Grout for under steel baseplates:
1. Grout shall be a prepackaged, non-metallic and non-gaseous. It shall be non -shrink when tested in accordance with ASTM -C1107 Grade B or C at a fluid consistency
(flow cone) of 20 to 30 seconds. Thirty -minute -old grout shall flow through the flow cone after slight agitation, in temperatures of 40 degrees F to 90 degrees F.
2. Grout shall be bleed free and attain 5,000 psi compressive strength in 28 days at fluid consistency.
K. Perimeter Insulation: Rigid extruded polystyrene cellular thermal board insulation with closed cells and integral high-density skin. Material shall comply with ASTM C 578
Type IV. Maximum flame spread and smoke developed values of 5 and 175 respectively.
1. Provide one of the following:
a) "SM" by the Dow Chemical Company
b) "Formular 250" by U C Industries, Inc
2.06 PROPORTIONING AND DESIGN OF MIXES
A. Design mixes to provide concrete with the properties indicated on the drawings and herein specified.
B. Prepare design mixes for each type and strength of concrete by either laboratory trial botch or field experience methods as specified in ACI 301. If contractor chooses
trial batch method, use an independent testing facility acceptable to Structural Enginez,r for preparing and reporting proposed mix designs. The testing facility shall not be
the some as used for field quality control testing unless acceptable to Engineer.
C. Submit written reports to General contractor and Engineer of each proposed mix for each class of concrete at least 15 days prior to start of work. Do not begin
concrete production until engineer has reviewed proposed mix designs.
D. Adjustment to Concrete Mixes: sub -contractor may request Mix design adjustments when characteristics of materials, job conditions, weather, test results, or other
circumstances warrant, as accepted by Engineer. Submit laboratory test data for revised nix design.
1. Revised mix design is subject to review and approval by Engineer.
E. Sub -contractor is to submit alternate concrete mix design for slabs -on -grade constructed before the roof construction is complete. Concrete
construction should meet the following requirements: P ete placed prior to roof
F. Concrete shall meet the following requirements and have properties as listed in the table below.
1. Fine aggregate shall be less than 45% of the total aggregate for the mix design.
2. Mid-range water -reducing retarding admixture is mandatory in concrete for flotwork.
3. Do not use high range water reducing admixtures for slabs -on -grade.
4. Use high -range water reducing admixture in pumped concrete and concrete with w/c ratio below 0.42.
5. Slump limits: Proportion and design mixes to result in concrete slump at point of placement as listed below. "Point of placement" means the discharge end of the
hose for pumped concrete.
a) Flat work:
(1) 3 to 5 inches (no water reducers used in concrete)
(2) 4 to 6 inches (with normal or mid range water reducer)
(3) 5 to 7 inches (with the addition of a Superplasticizer). Concrete slump prior to the addition of superplasticizer shall have a maximum 3 -inch slump.
(4) Other concrete: 4 to 6 inches
6. The cementitious content should be adequate for the class of concrete listed. Concrete supplier may request deviation to the amounts listed. Deviations must be
approved by the structural engineer.
G. Slag Cement is an option in the concrete. Slag cement may replace Portland cement on a 1:1 ratio. Slag cement shall represent no more than 50% of the total
cementitious material.
H. Fly ash is an option in concrete, subject to the limits listed in the table below.
1. The minimum and maximum amount of fly ash is listed for each class of concrete.
2. Provide 1.00 lbs. of Type C fly ash for each pound of cement removed.
3. Provide 1.25 lbs. of Type F fly ash for each pound of cement removed.
I. Concrete for Footings
1. Total Cementitious Content: Minimum 470 lbs./cyd,
2. Fly Ash: Minimum 71 lbs./cyd, Maximum 117 lbs./cyd
3. Water/Cementitious Material Ratio: 0.45 to 0.58
4. Entrained Air Content: Not required
5. Coarse Aggregate: ASTM #57
6.28 -day Compressive Strength: 3,000 psi
J. Concrete for Pilasters, Retaining, Knee and Foundation Walls
1. Total Cementitious Content: Minimum 470 lbs./cyd
2. Fly Ash: Minimum 71 lbs./cyd, Maximum 94 lbs./cyd
3. Water/Cementitious Material Ratio: 0.40 to 0.45
4. Entrained Air Content: minimum 3.0%, maximum 6.0%
5. Coarse Aggregate: ASTM #57
6.28 -day Compressive Strength: 4,000 psi
K. Concrete for Interior Slabs -on -Grade 4" to 6" thick
1. Total Cementitious Content: Minimum 470 lbs./cyd, maximum 517 lbs/cyd
2. Fly Ash: Minimum 71 lbs./cyd, Maximum 104 lbs./cyd
3. Water/Cementitious Material Ratio: 0.45 to 0.50
4. Entrained Air Content: Not required
5. Coarse Aggregate: ASTM #57
6.28 -day Compressive Strength: Minimum 3,500 psi, maximum 4,500 psi
L Concrete for Exterior Applications
1. Total Cementitious Content: Minimum 564 lbs./cyd, maximum 611 lbs/cyd
2. Fly Ash: Minimum 0 Ibs./cyd, Maximum 113 Ibs./cyd
3. Water/Cementitious Material Ratio: 0.40 to 0.45
4. Entrained Air Content: Minimum 5.50%, maximum 6.0%
5. Coarse Aggregate (crushed limestone): ASTM #57
6.28 -day Compressive Strength: minimum 4,000 psi, maximum 4,900 psi
M. Normal Weight Concrete for Interior Slabs on Steel Deck and precast planks
1. Total Cementitious Content: Minimum 470 Ibs./cyd, maximum 564 Ibs/cyd
2. Fly Ash: Minimum 71 Ibs./cyd, Maximum 104 Ibs./cyd
3. Water/Cementitious Material Ratio: 0.45 to 0.50
4. Entrained Air Content: Not required
5. Coarse Aggregate: ASTM #6
6.28 -day Compressive Strength: Minimum 3,500 psi, maximum 4,500 psi
2.7 ADMIXTURES
A. General: Use all admixtures in compliance with manufacturers recommendations. All admixtures are subject to review by the Engineer.
B. Use water -reducing admixture or high range water -reducing admixture (Superplasticizer) in concrete as required for placement and workability (where allowed).
C. Use admixtures in concrete as recommended by manufacturer for climatic conditions prevailing at time of placement.
D. Use air entraining admixture in exterior exposed concrete. Add air entraining admixture at manufacturers prescribed rote to result in concrete at point of placement
having total air content as specified.
2.8 CONCRETE MIXING & DELIVERY
A. Ready -Mix Concrete: Comply with requirements of ASTM C 94, and these specifications.
1. When air temperature is between 85 deg F (30 deg C) and 90 deg F (32 deg C), reduce mixing and delivery time from 1 1/2 hours to 60 minutes, and when air
temperature is above 90 deg F (32 deg C), reduce mixing and delivery time to 45 minutes.
PART 3 EXECUTION
3.01 GENERAL
A. Examine substrates, adjoining construction and conditions under which work will be installed. Do not proceed with work until correction of unsatisfactory conditions
detrimental to the proper and timely completion of the work.
1. Do not proceed with work until the controlling contractor has provided evidence, satisfactory to sub -contractor, that the site is ready per OSHA sub -part R.
2. Concrete supporting structural steel must obtain a compressive strength (f'c) of 2,500 psi before setting steel.
3. Concrete supporting structural steel must obtain a compressive strength (f'c) of 3,000 psi before placing concrete on elevated decks.
B. Coordinate installation of joint materials, vapor retarder and other required or related materials with placement of forms and reinforcement.
3.02 FORMS
A. General: Design, erect, support, brace, and maintain formwork to support vertical and lateral, static and dynamic loads that might be applied until concrete structure can
support such loads. Construct formwork for concrete members to correct size, shape, alignment, elevation, and position. Formwork construction tolerances shall comply
with ACI 347.
B. Construct forms to sizes, shapes, lines, and dimensions shown and to obtain accurate alignment, location, grades, level, and plumb work in finished structures. Provide
for openings, offsets, sinkages, keyways, recesses, moldings, rustication, reglets, chamfers, blocking, screeds, bulkheads, anchorages and inserts, and other features
required in work. Use selected materials to obtain required finishes. Solidly butt joints and provide backup at joints to prevent leakage of cement paste.
C. Fabricate forms for easy removal without hammering or prying against concrete surfaces. Provide crush plates or wrecking plates where stripping may damage cast
concrete surfaces. Provide top forms for inclined surfaces where slope is too steep to place concrete with bottom forms only. Kerf wood inserts for forming keyways,
reglets, recesses, and the like, for easy removal.
D. Provide temporary openings where interior area of formwork is inaccessible for cleanout and inspection before concrete placement. Securely brace temporary openings and
set tightly to forms to prevent loss of concrete mortar. Locate temporary openings in forms at inconspicuous locations.
E. Chamfer exposed comers and edges as indicated, using wood, metal, PVC, or rubber chamfer strips fabricated to produce uniform smooth lines and tight edge joints.
F. Provisions for Other Trades: Provide openings in concrete formwork to accommodate work of other trades. Determine size and location of openings, recesses, and chases
from trades providing such items. Accurately place and securely support items built into forms.
G. Cleaning and Tightening: Thoroughly clean forms and adjacent surfaces to receive concrete. Remove chips, wood, sawdust, dirt, or other debris just before placing
concrete. Retighten forms and bracing before concrete placement as required preventing mortar leaks and maintaining proper alignment.
3.03 STONE BASE COURSE
A. Compact in accordance with the recommendations outlined in the geotechnical report.
B. DO NOT moisten sub base before starting slab pour.
3.04 VAPOR RETARDER/BARRIER INSTALLATION
A. General: Following leveling and tamping of granular base for slabs -on -grade, place vapor retarder/barrier sheeting with longest dimension parallel with direction of pour.
B. Lap joints 6 inches and seal joints with manufacturers' recommended mastic and pressure -sensitive tape.
3.05 PLACING REINFORCEMENT
A. General: Comply with Concrete Reinforcing Steel Institute's "Recommended Practice for Placing Reinforcing Bars," for details and methods of reinforcement placement and
supports and as herein specified.
B. Clean reinforcement of loose rust and mill scale, earth, ice, and other materials that reduce or destroy bond with concrete.
C. Accurately position, support, and secure reinforcement bars against displacement. Locate and support reinforcing by metal chairs, runners, bolsters, spacers, and hangers,
as approved by Engineer.
D. Place reinforcement to obtain at least the minimum coverage for concrete protection. Arrange, space, and securely be bars and bar supports to hold reinforcement in
position during concrete placement operations. Set wire ties with ends directed into concrete, not toward exposed concrete surfaces.
3.06 JOINTS
A. Construction Joints: Locate and install construction joints as indicated or, if not indicated, locate so as not to impair strength and appearance of the structure, as
acceptable to Structural Engineer.
1. Location of construction joints in slab -on -grade and slab -on -metal deck does not require review by structural engineer.
B. Place construction joints perpendicular to main reinforcement. Continue reinforcement across construction joints except as otherwise indicated. Do not continue
reinforcement through sides of slab placements.
C.Isolation Joints in Slabs on Ground: Construct isolation joints in slabs on ground at points of contact between slabs on ground and vertical surfaces, such as column
pedestals, foundation walls, grade beams, and elsewhere as indicated.
D. Contraction Joints in Slabs on Ground: Construct contraction joints in slabs on ground to form panels of patterns as shown using a soff-cut saw. Use saw cuts
approximately 1/8 inch wide. Joint depth should be as recommended by the soff-cut saw manufacturer. Cut joints cut in slab before concrete reaches a compressive
strength of 500 psi but without dislodging aggregate or otherwise damaging the concrete.
1. See Division 7 Sections for filler and sealant material specifications.
3.07 INSTALLATION OF EMBEDDED ITEMS
A. General: Set and build into work anchorage devices and other embedded items required for other work that is attached to or supported by cast -in-place concrete. Use
setting drawings, diagrams, instructions, and directions provided by suppliers of items to be attached thereto.
B. Anchor rods must be set in place to line and elevation using a 3/4" plywood template with a 20 -template support system prior to ;he placement of concrete. Hold the
tops of the rods vertical using the plywood template. Tie the bottoms of the rods in place to insure the rods are held vertical during the concrete placement activity.
Fabricator to furnish two nuts for each rod to attach each anchor rod to the plywood template. ty
C. Anchor rods must not vary from the plan dimensions by more than the following (per AISC Code of Standard Practice):
1. Anchor rods must not vary more than 1/16" inch center -to -center of any two bolts within an anchor rod group. Where an anchor rod group is defined as a set of
anchor rods, which receives a single fabricated steel piece.
2. Anchor rods must not vary more than 1/8" center -to -center of other anchor rod groups.
3. Anchor rods must not vary more than +/- 1/4" in projection elevation to the top of the anchor rod.
4. Leveling plates must be set to elevation as noted on the setting drawings.
5. Vibrate all concrete that will encase anchor rods.
6. The installing contractor must clean all anchor rods and leveling plates after their installation. Remove concrete, grout and dirt before the placement of structural steel.
D. Forms for Slabs: Set edge forms, bulkheads, and intermediate screed strips for slabs to obtain required elevations and contours in finished surfaces.
3.08 PREPARATION OF FORM SURFACES
A. General: Coat contact surfaces of forms with the specified form -coating compound before placing reinforcement.
B. Do not allow excess form -coating material to accumulate in forms or to come into contact with in-place concrete surfaces against which fresh concrete will be placed.
Apply in compliance with manufacturers instructions.
C. Coat steel forms with a non -staining, rust -preventative material. Rust -stained steel formwork is not acceptable.
SEE SHEET S402 FOR CONTINUATION