|
STRUCTURAL
<br />SPECIFICATIONS
<br />DLX8 - EVSG 10192300127 .00 2025.02.20
<br />
<br />CAST-IN-PLACE CONCRETE 03 30 00 - 9
<br />C. Slump: Adjust quantity of water so concrete at point and time of placing does not
<br />exceed the following slumps when tested according to ASTM C143. Use the minimum
<br />water necessary for workability required by part of structure being cast.
<br />SLUMP AND WATER/CEMENT RATIOS
<br />Part of Structure Maximum Slump
<br />Inches*
<br />Maximum Water-
<br />Cement
<br />Ratio
<br />Footings, foundation walls, and mass concrete, not
<br />reinforced
<br /> 4 0.55
<br />
<br />Slabs on grade, reinforced and non-reinforced 4 0.45
<br />Reinforced concrete walls 4 0.5
<br />Concrete fill on metal deck 4 0.55
<br />All other concrete 4 0.5
<br />
<br />
<br />*If super-plasticizers are used, slumps may be 6"-8" for all concrete, with water-cement ratio
<br />unchanged or lower than slumps without admixture.
<br />
<br />2.3 SLURRY CONCRETE:
<br />A. Slurry concrete shall conform to requirements of this section for regular concrete,
<br />except that testing will not be required. Slurry concrete shall contain not less than 2
<br />sacks of cement per cubic yard. Aggregate may be material selected from excavation,
<br />free from organic matter, or imported fill, conforming to the following gradation:
<br />Sieve Size Percent passing
<br />
<br />1-1/2" 100
<br />1" 80 - 100
<br />3/4" 60 - 100
<br />3/8" 50 - 100
<br />No. 4 40 - 80
<br />No. 100 10 - 40
<br />
<br />B. Water shall be added to produce a fluid, workable mix that will flow and can be pumped
<br />without segregation of aggregate. Materials shall be mechanically mixed until the
<br />cement and water are thoroughly dispersed.
<br />DLX8 - EVSG 10192300127 .00 2025.02.20
<br />
<br />CAST-IN-PLACE CONCRETE 03 30 00 - 10
<br />PART 3 - EXECUTION
<br />3.1 PREPARATION FOR CONCRETE PLACING:
<br />A. Remove all free water from forms before concrete is deposited. Remove hardened
<br />concrete, debris, and foreign materials from interior surfaces of forms, exposed
<br />reinforcing, and from surfaces of mixing and conveying equipment.
<br />B. Wetting: Wet wood forms sufficiently to tighten up cracks. Wet other materials
<br />sufficiently to reduce adsorption and to help maintain concrete workability.
<br />C. Earth Subgrade: Dampen 24 hours before placing concrete, but do not muddy. Re-roll
<br />where necessary for smoothness and remove loose material.
<br />D. Gravel Fill: Recompact disturbed gravel and bring to correct elevation.
<br />E. Sand Beds or Subslab Drainage Fill: Recompact disturbed material and bring to correct
<br />elevation.
<br />F. Vapor Barrier: Install under interior floor slabs on grade. Lap joints 6" in the direction
<br />of concrete spreading and tape seal. Seal the joints at walls and around penetrations
<br />with tape. Cover barrier with 2" layer of clean damp sand.
<br />G. Screeds: Set screeds at walls and maximum 8-foot centers between. Set to provide
<br />level floor. Check with an instrument level, transit, or laser during placing operation to
<br />maintain level floor.
<br />H. Screeds over Vapor Barrier: Use weighted pad or cradle type screeds and do not drive
<br />stakes through the vapor barrier. Check with an instrument level, transit, or laser.
<br />I. Expansion Joint Filler: Install where slabs abut buildings and elsewhere as indicated.
<br />Install full depth of concrete with top level with finished surface of concrete.
<br />J. Metal Floor Decking: Verify that decking joints are sealed and there are no openings or
<br />voids that will permit concrete leakage.
<br />K. Composite Steel Beams: Provide shores for tributary construction loads to floor and
<br />roof beams as required, or camber the beams as approved by Architect.
<br />
<br />3.2 CONCRETE PLACING:
<br />A. Conveying and Placing: Comply with ACI 304. Do not place concrete until the reinforcing
<br />steel, embedded items, forms, or metal decking have been approved. Do not use
<br />aluminum tubes or any aluminum equipment for pumping concrete, nor allow concrete
<br />to free fall from its point of release at mixer, hoppers, tremies, or conveying equipment
<br />more than 5 feet for concealed concrete and 3 feet for exposed concrete. Deposit
<br />concrete in 18” maximum lifts within 90 minutes after water is first added to the batch
<br />and so that the surface is kept level throughout, a minimum being permitted to flow
<br />DLX8 - EVSG 10192300127 .00 2025.02.20
<br />
<br />CAST-IN-PLACE CONCRETE 03 30 00 - 11
<br />from one portion to another. Place concrete by methods that prevent segregation of
<br />materials.
<br />1. Where new concrete is placed against or on old or existing concrete, apply
<br />bonding agent to properly prepared surface of old concrete prior to placement
<br />of new concrete. Prepare surface in accordance with ICRI.
<br />2. Exception: When using super-plasticizers, the free fall, horizontal layer
<br />thickness and time limitations may be doubled.
<br />
<br />B. Placement in Forms: Limit horizontal layers to depths which can be properly
<br />consolidated, but in no event greater than 24 inches.
<br />1. Consolidate concrete by means of mechanical vibrators, inserted vertically in
<br />freshly placed concrete in a systematic pattern at close intervals. Penetrate
<br />previously placed concrete to ensure that separate concrete layers are knitted
<br />together.
<br />2. Vibrate concrete sufficiently to achieve consistent consolidation without
<br />segregation of coarse aggregates.
<br />3. Do not use vibrators to move concrete laterally.
<br />C. Protection: Ensure that reinforcement, embedded products, joint fillers and joint
<br />devices are not disturbed during concrete placement.
<br />D. Joints in Concrete: Locate construction joints only where approved, and obtain prior
<br />approval for points of stoppage of any pour. Clean and roughen the surface of
<br />construction joints by removing the entire surface and exposing 1/4" amplitude of clean
<br />aggregate solidly embedded in mortar matrix by sandblasting, chipping, use of an
<br />approved surface retarder, or equal. Water and keep hardened concrete wet for not
<br />less than 24 hours and slush with portland cement slurry just before placing joining
<br />concrete. Cover horizontal surfaces of existing or previously placed and hardened
<br />concrete with a 2" thick layer of fresh concrete less 50% of coarse aggregate just before
<br />balance of concrete is placed.
<br />E. Vertical Elements: Stop placement of concrete in walls and columns 1-1/2" below
<br />bottom of beams or supported slabs. Stop placement at sills and heads of wall openings
<br />in the same manner. Allow concrete in vertical elements to be in place at least 2 hours
<br />and until vertical settlement has ceased before placing concrete for floor framing.
<br />F. Compacting: Compact each layer of the concrete as placed with mechanical vibrators
<br />or equivalent equipment. Transmit vibration directly to concrete and in no case through
<br />the forms unless approved. Accomplish thorough compaction. Supplement by rodding
<br />or spading by hand adjacent to forms. Compact concrete into corners and angles of
<br />forms and around reinforcement and embedded fixtures. Recompact deep sections
<br />with congestion due to reinforcing steel as required.
<br />G. Operation of Vibrators: Do not horizontally transport concrete in forms with vibrators
<br />nor allow vibrators to contact forms or reinforcing. Push vibrators vertically into the
<br />preceding layers that are still plastic and slowly withdraw, producing maximum
<br />obtainable density in concrete without creating voids or segregation. In no case disturb
<br />DLX8 - EVSG 10192300127 .00 2025.02.20
<br />
<br />CAST-IN-PLACE CONCRETE 03 30 00 - 12
<br />concrete that has partially set. Vibrate at intervals not exceeding two-thirds the
<br />effective visible vibration diameter of the submerged vibrator. Avoid excessive
<br />vibration that causes segregation. Use and type of vibrators shall conform to ACI 309
<br />"Recommended Practice for Consolidation of Concrete".
<br />H. Correction of Segregation: Before placing next layer of concrete, and at the top of last
<br />placement for vertical elements, remove concrete containing excess water or fine
<br />aggregate or showing deficiency of coarse aggregate and fill the space with compacted
<br />concrete of correct proportions.
<br />I. Waterproof Membranes: Perform work adjacent to waterproof membranes to prevent
<br />damage to membranes. Arrange work so that membrane is left unprotected for
<br />minimum period of time, as approved. Prior to placing concrete, inspect the membrane
<br />and arrange for repair to all damage which may have occurred.
<br />J. Concrete Encased Columns: Clean columns as specified for cleaning other steel in
<br />contact with concrete. When concrete is not carried to structure above, stop concrete
<br />perpendicular to column axis at the same elevation on all parts of all columns in the
<br />space. Float top neatly to column.
<br />K. Slabs:
<br />1. Float Finish: Place, consolidate, strike off and level concrete slab to proper
<br />elevation. Use highway straightedge, bull float or darby. Remove all bleed
<br />water. After the concrete has stiffened sufficiently to permit the operation, and
<br />water sheen has disappeared, the surface shall be floated, at least twice, to a
<br />uniform sandy texture. Remainder of finishing operations shall be as specified
<br />in Section 03 34 50 for each type of surface.
<br />2. On-Grade Slabs: Place with maximum 40-foot edge dimension. Generally
<br />locate joints on column lines, exact locations as directed or approved.
<br />3. On-Grade Slab Construction and Contraction Joints: Use types as indicated at
<br />column lines intermediate locations.
<br />4. Expansion Joints: Conform to details and approved submittal. Provide
<br />expansion joint filler finished flush with slab surface except for those joints
<br />shown to be sealed with sealant. Conform to Section 07 92 00 where sealant
<br />sealed joints are shown or specified, including the polymer joint filler, backing,
<br />and bond breaker.
<br />5. Control Joints: Provide for concrete slabs as indicated. At Contractor's option,
<br />"Soff-Cut" saw may be used to depth of 1-1/4" immediately providing spalling
<br />or undercutting of the concrete does not occur, and in no case shall slab
<br />reinforcement be cut or damaged. Conventional saws shall be used as soon as
<br />possible without dislodging aggregate to 1/4 slab thickness. Complete sawing
<br />of joints within 12 hours after finishing is completed. If early sawing causes
<br />undercutting or washing of the concrete, delay the sawing operation and repair
<br />the damaged areas. The saw cut shall not vary more than 1/2 inch from the true
<br />joint alignment. Discontinue sawing if a crack develops ahead of a saw cut.
<br />Immediately after each joint is sawed, thoroughly clean the saw cut and
<br />adjacent concrete surface. Respray surfaces treated with curing compound
<br />DLX8 - EVSG 10192300127 .00 2025.02.20
<br />
<br />CAST-IN-PLACE CONCRETE 03 30 00 - 13
<br />which are damaged during the sawing operations as soon as the water
<br />disappears. Protect joints in a manner to prevent the curing compound from
<br />entering the joints.
<br />
<br />3.3 COLD WEATHER PROVISIONS:
<br />
<br />A. Conform to ACI 306 and the following requirements.
<br />B. Normal Concrete: When the temperature is below 40 degrees F. the temperature of
<br />the concrete placed in the forms shall be at least 60 degrees F. When the temperature
<br />is below 30 degrees F. the temperature of the concrete as mixed shall be 65 degrees F.
<br />In all cases, when the daily average temperature is below 40 degrees F. the concrete
<br />shall be kept at 55 degrees F. for 72 hours and then allowed to drop uniformly to the
<br />air temperature over the next 24 hours.
<br />1. Concrete temperature shall be measured by placing a thermometer 2" from the
<br />top of the concrete being placed.
<br />C. Air-entrained concrete shall be kept at the above temperature for 27 hours and above
<br />freezing for an additional 72 hours.
<br />D. No calcium chloride shall be used to accelerate hardening of concrete. Contractor to
<br />certify that any additive used does not contain calcium chloride.
<br />E. If low temperature accelerating admixture is proposed, adjust concrete mix as required
<br />and obtain approval of Architect.
<br />F. All concrete materials, reinforcement, forming materials and ground with which
<br />concrete is to come in contact shall be free of frost.
<br />G. The covering or other protection used in connection with the curing shall remain in place
<br />and intact for at least 24 hours.
<br />H. The work shall be protected from the elements, flowing water, and defacements of any
<br />nature during the construction operations.
<br />3.4 HOT WEATHER PROVISIONS:
<br />A. Conform to ACI 305 and the following requirements.
<br />B. Take extra care to reduce the temperature of the concrete being placed, and to prevent
<br />rapid drying of newly placed concrete. When the outdoor ambient temperature is more
<br />than 90 degrees F., shade the fresh concrete as soon as possible after placing, and start
<br />curing as soon as the surface of the fresh concrete is sufficiently hard to permit it
<br />without damage. Using retarding admixture at 85F or higher.
<br />C. Concrete placement temperatures shall be controlled by the Contrac tor and shall not
<br />be limited to:
<br />DLX8 - EVSG 10192300127 .00 2025.02.20
<br />
<br />CAST-IN-PLACE CONCRETE 03 30 00 - 14
<br />1. Shading and cooling the aggregate;
<br />2. Avoiding use of hot cement;
<br />3. Cooling mixing water by additions of ice;
<br />4. Insulating water supply lines and tanks; and
<br />5. Insulating mixer drums or cooling them with sprays or wet burlap.
<br />D. Unexposed Form Finish: Repair tie holes and patch defective areas. Rub down or chip
<br />off fins or other raised areas exceeding 1/4-inch height.
<br />E. Exposed Form Finish: Repair and patch defective areas, with fins or other projections
<br />completely removed and smoothed.
<br />1. Grout cleaned finish: Apply to surfaces indicated after all contiguous surfaces
<br />are accessible; do not clean as work progresses.
<br />a. Prepare grout using 1 part portland cement, 1-1/2 parts fine sand, and
<br />enough water to produce a mixture with consistency of thick paint.
<br />Achieve grout color matching concrete surface color by blending normal
<br />and white portland cements.
<br />b. Wet areas to be cleaned and apply grout mixture evenly by brush or
<br />spray. Scrub surface immediately after grout application to fill minor air
<br />bubbles, using cork float or stone, and remove excess grout while it is
<br />still plastic. After initial drying, rub surface vigorously with clean burlap,
<br />and keep moist for not less than 36 hours.
<br />2. Contiguous unformed surfaces: Strike smooth and float to a similar texture tops
<br />of walls, horizontal offsets, and other unformed surfaces adjacent to or
<br />contiguous with formed surfaces. Continue final finish of formed surfaces
<br />across unformed surfaces, unless otherwise specifically indicated.
<br />
<br />3.5 FINISHING SLABS:
<br />A. Interior Floor and Exterior Slab Finishes and Tolerances, General: See SCHEDULE in
<br />Section 3.17 of this specification for finishes. Achieve flat, level planes except where
<br />slopes or grades are indicated. Tolerances shall be in accordance with FF (flatness)
<br />and FL (levelness) as defined in ACI 117.
<br />
<br />B. Finishing Operations, General: Do not directly apply water to slab surface or dust with
<br />cement. Use hand or powered equipment only as recommended in ACI 302.1.
<br />C. Screeding: Strikeoff to required grade and within surface tolerances indicated. Verify
<br />conformance to surface tolerances. Correct deficiencies while concrete is still plastic.
<br />D. Bull Floating: Immediately following screeding, bull float or darby before bleed water
<br />appears to eliminate ridges, fill in voids, and embed coarse aggregate. Recheck and
<br />correct surface tolerances.
<br />E. Final floating: Do not perform subsequent finishing until excess moisture or bleed water
<br />has disappeared and concrete will support either foot pressure with less than 1/4-inch
<br />indentation or weight of power floats without damaging flatness.
<br />DLX8 - EVSG 10192300127 .00 2025.02.20
<br />
<br />CAST-IN-PLACE CONCRETE 03 30 00 - 15
<br />1. Float to embed coarse aggregate, to eliminate ridges, to compact concrete, to
<br />consolidate mortar at surface, and to achieve uniform, sandy texture.
<br />2. Recheck and correct surface tolerances.
<br />F. Troweling: Trowel immediately following final floating.
<br />1. Apply first troweling with power trowel except in confined areas, and apply
<br />subsequent trowelings with hand trowels.
<br />2. Wait between trowelings to allow concrete to harden. Do not over-trowel.
<br />3. Begin final troweling when surface produces a ringing sound as trowel is moved
<br />over it. Consolidate concrete surface by final troweling operation. Completed
<br />surface shall be free of trowel marks, uniform in texture and appearance, and
<br />within surface tolerance specified.
<br />4. Grind smooth surface defects which would telegraph through final floor
<br />covering system.
<br />G. Finishes:
<br />1. Trowel Finish: Apply a trowel finish to monolithic slab surfaces exposed to view
<br />and slab surfaces to be covered with resilient flooring, carpet, ceramic or quarry
<br />tile on mortar bed, and paint or another thin film-finish coating system. Grind
<br />smooth any surface defects that would telegraph through applied floor covering
<br />system.
<br />2. Trowel and Burnished Finish: In warehouse storage and materials handling
<br />areas, at exposed concrete floor slab, trowel finish as specified above with
<br />burnishing in compliance with Class 5 requirements according to ACI 301,
<br />without topping.
<br />3. Non-Slip Broom Finish: Apply a non-slip broom finish to troweled finish at
<br />exterior concrete platforms, steps, and ramps, and elsewhere as indicated.
<br />Immediately after float finishing, slightly roughen concrete surface by brooming
<br />with fiber-bristle broom perpendicular to main traffic route.
<br />H. Repair of Slab Surfaces: Test slab surfaces for smoothness and to verify surface plane
<br />to tolerance specified. Repair defects as follows:
<br />
<br />1. High areas: Correct by grinding after concrete has cured for not less than 14
<br />days.
<br />2. Low areas: Immediately after completion of surface finishing operations, cut
<br />out low areas and replace with fresh concrete. Finish repaired areas to blend
<br />with adjacent concrete. Proprietary patching compounds may be used when
<br />approved by the Architect or Structural Engineer.
<br />3. Crazed or cracked areas: Cut out defective areas, except random cracks and
<br />single holes not exceeding 1-inch in diameter, by cutting out and replacing with
<br />fresh concrete. Remove defective areas with clean, square cuts. Dampen
<br />exposed concrete and apply bonding compound. Mix, place, compact, and
<br />finish patching concrete to match adjacent concrete.
<br />4. Isolated cracks and holes: Groove top of cracks and cut out holes not over 1-
<br />inch in diameter. Dampen cleaned concrete surfaces and apply bonding
<br />DLX8 - EVSG 10192300127 .00 2025.02.20
<br />
<br />CAST-IN-PLACE CONCRETE 03 30 00 - 16
<br />compound; place dry pack or proprietary repair compound acceptable to
<br />Architect or Structural Engineer while bonding compound is still active:
<br />a. Dry-pack mix: One part portland cement to 2-1/2 parts fine aggregate
<br />and enough water as required for handling and placing.
<br />b. Install patching mixture and consolidate thoroughly, striking off level
<br />with and matching surrounding surface. Do not allow patched areas to
<br />dry out prematurely
<br />
<br />3.6 CONCRETE CURING AND SEALING:
<br />A. Curing, General: Protect freshly placed concrete from premature drying and excessive
<br />cold or hot temperatures. Use curing method compatible with applied finishes,
<br />waterproofing and other coatings. When coatings or waterproofing are to be applied
<br />to concrete or when concrete is intended to remain exposed, use moist curing (sheet)
<br />method only. See Schedule at end of this Section.
<br />1. In hot, dry, and windy weather protect concrete from rapid moisture loss before
<br />and during finishing operations with an evaporation-control material.
<br />2. Start initial curing as soon as free water has disappeared from concrete surface
<br />after placing and finishing. Weather permitting, keep continuously moist for
<br />not less than 7 days, or as recommended by manufacturer.
<br />3. Apply curing compounds after screeding and bull floating, but before power
<br />floating and troweling.
<br />4. Apply sealer hardener compounds as scheduled at end of this Section.
<br />
<br />B. Application of Liquid and Dust-On Agents: Apply agents in accordance with
<br />manufacturer's instructions and recommendations.
<br />C. Curing, Floors and Slabs: Apply curing compound on exposed interior slabs and on
<br />exterior slabs, walks, and curbs as follows:
<br />1. Floor slabs to receive concrete floor topping or mortar setting beds for ceramic
<br />tile or stone tile: Curing compound or moist cure.
<br />2. Floor slabs to receive adhesively-applied resilient flooring or carpet: Moist cure
<br />or curing/hardening and dustproofing compound (compatible with flooring
<br />adhesives) when acceptable to Architect or Structural Engineer. Coordinate
<br />moist curing with flooring application requirements and provide sealer as
<br />necessary to avoid detrimental affect of dusting.
<br />3. Floor slabs to receive waterproof membrane or thinset ceramic tile: Moist cure
<br />only.
<br />4. Floor slabs to remain exposed and receive only light traffic (electrical rooms and
<br />equipment rooms): Curing, hardening and dustproofing compound or moist
<br />cure. If moist cure, apply one coat of surface hardening and dustproofing
<br />compound as specified for other exposed floor slabs.
<br />5. Floor slabs to remain exposed and receive normal pedestrian and light vehicle
<br />traffic: Moist cure. Apply specified sealers or surface hardening compound as
<br />scheduled at end of this Section.
<br />6. Equipment pads and bases: Match surrounding floor.
<br />S0.06
<br />N
<br />I
<br />R
<br />G
<br />T
<br />RE
<br />TATSS
<br />E OFILACFO
<br />UC TURA
<br />R
<br />L
<br />R
<br />STERED P L
<br />OF ESSIONA
<br />N
<br />E
<br />R
<br />AI
<br />E
<br />ENGI
<br />................
<br />.
<br />.
<br />.
<br />...............................
<br />.
<br />.
<br />.
<br />...............
<br />No. 5913
<br />Exp. 12/31/25CHR
<br />I
<br />STOPHER A NDREW
<br />DOM
<br />I
<br />NAS
<br />N
<br />I
<br />R
<br />G
<br />T
<br />RE
<br />TATSS
<br />E OFILACFO
<br />UC TURA
<br />R
<br />L
<br />R
<br />STERED P L
<br />OF ESSIONA
<br />N
<br />E
<br />R
<br />AI
<br />E
<br />ENGI
<br />................
<br />.
<br />.
<br />.
<br />...............................
<br />.
<br />.
<br />.
<br />...............
<br />No. 5913
<br />Exp. 12/31/25CHR
<br />I
<br />STOPHER A NDREW
<br />DOM
<br />I
<br />NAS
<br />N
<br />I
<br />R
<br />G
<br />T
<br />RE
<br />TATSS
<br />E OFILACFO
<br />UC TURA
<br />R
<br />L
<br />R
<br />STERED P L
<br />OF ESSIONA
<br />N
<br />E
<br />R
<br />AI
<br />E
<br />ENGI
<br />................
<br />.
<br />.
<br />.
<br />...............................
<br />.
<br />.
<br />.
<br />...............
<br />No. 5913
<br />Exp. 12/31/25CHR
<br />I
<br />STOPHER A NDREW
<br />DOM
<br />I
<br />NAS
|