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SECTION 03305 - DOC - DOC Powered By Docstoc
					DaimlerChrysler                                                                       Construction Standards



1.1        SUMMARY

      A.   This Section specifies concrete floor slab work, which includes, but not limited to:
           1.    Steel fiber reinforcing.
           2.    Cast-in-place concrete.
           3.    Epoxy floor fill at locations indicated.

      B.   Related Work Specified In Other Sections:
           1.    Division 3 Section "Cast-In-Place Concrete" for basic concrete work.

      C.   Alternates:
           1.     Base Bid is use of Bekaert “Dramix RC65/60BN” steel fibers. Alternate is to use Bekaert
                  “Dramix RC80/60BN” steel fiber with dosage of not less than 50 lb/cu yd.
           2.     Base Bid is use of Bekaert “Dramix RC65/60BN” steel fibers. Alternate is to use Novacon
                  “Twincone” steel fiber with dosage of not less than 50 lb/cu yd.


      A.   Engineering Responsibility: Engage a qualified professional engineer to prepare or supervise
           the preparation of mix designs data for steel fiber reinforced concrete.
           1.     Professional Engineer Qualifications: A professional engineer who is legally qualified to
                  practice in the jurisdiction where Project is located and who has not less than five years
                  experience in providing engineering services for steel fiber reinforced concrete floor slabs,
                  and who is normally engaged in this type of work. Engineering services are defined as
                  those performed for design of industrial floor slabs-on-grade that are similar to those
                  indicated for this Project in material, design, and extent.

      B.   Performance design of floor slabs shall be prepared by the Contractor's engineer in accordance
           with the following criteria. Provide dual design criteria; for the first design mix use stipulated
           fiber quantity and furnish allowable design loads; for the second design mix use stipulated
           design loads and furnish required fiber quantity for the most economical slab design.
           1.      Minimum 28 Days Flexural Strength: 700 psi unless otherwise indicated.
           2.     Minimum 28 Days Compressive Strength: 4000 psi unless otherwise indicated.
           3.     Minimum Slab Thickness: 8 inches
           4.     Minimum 28 Days Compressive Strength: 4000 psi unless otherwise indicated.
           5.     Minimum Modulus Of Subgrade Reaction: K= 100 pci
           6.     Either Minimum R10,50 Toughness Ratio of 65 percent; or Minimum Re,3 Value of 55
           7.     Minimum Uniformly Distributed Loads: 1200 psf
           8.     Minimum Concentrated Loads:
                  a.     Forklift Truck Loads:
                                                    Wheel Spacing          Axle Loads           Capacity
                          Single wheel solid tire       35”-37”              25 kips            12 kips
                          Single pneumatic tire         35”-37”              25 kips            12 kips
                          Dual wheel pneumatic tire     41”/10”              28 kips            13 kips
                  b.     Post Loads:
                                                   Base Plate 8”x8” Base Plate 12”x12”           Spacing
                          Max point loads-2 loads      25 kips               25 kips               24”
                          Max point loads-3 loads      25 kips               25 kips             36”- 36”
                          Max point loads-4 loads      28 kips               28 kips           36”-24”-36”

1.3        SUBMITTALS

INDUSTRIAL CONCRETE FLOOR SLABS                                                                   03305 - 1 of 11
DaimlerChrysler                                                                      Construction Standards

      A.   Source of ready-mixed concrete for approval.

      B.   Manufacturer's product data, performance criteria and other documentation for each material
           specified in this Section that is proposed for use, including:
           1.     Admixtures.
           2.     Liquid curing/sealing compound.
                  a.     If products have not been reviewed and accepted by DaimlerChrysler Health or
                         Environmental groups, include MSDS information as a separate submittal directed
                         to the Owner for review.
           3.     Premolded joint filler.
           4.     Reinforcing fibers.
           5.     Bonding agent.
           6.     Joint sealants.

      C.   Shop drawings including the following:
           1.    Locations of drains, trenches, manholes, and other items.
           2.    Floor joint layout indicating:
                 a.     Number and sequence of placements.
                 b.     Sizes and shapes of placements (shapes shall be square or rectangular only).
                 c.     Types (construction or control) and spacing of joints.

      D.   Include the following:
           1.    Proposed method for bulkheads and formwork.
           2.    Proposed placement equipment.
           3.    Schedule of events and casting plan regarding placement operations, and records of
                 concrete casts.
           4.    Mill test certification for steel fiber reinforcement in accordance with ASTM A 820.
           5.    Identity Chart standardization test for the steel fiber(s) used.
           6.    Certification of chloride ion content from admixture suppliers.

      E.   Concrete Mix Design: Submit concrete supplier's concrete mix design information based on
           requirements specified in "Concrete Mix Proportions".
           1.     Submit a concrete mix design prepared by either the “laboratory trial batch” or the field
                  experience” method as specified in CSA A 23.1 for approval. Provide proportions of
                  cement, fine aggregate, coarse aggregate, and water.
           2.     Submit SFRC design proposal for the floor slab indicating the dosage, type, size and the
                  shape of the steel fiber. Verify the number of fibers per unit volume and provide
                  information on mechanical characteristics of the chosen fiber and its identity chart.
           3.     Mix design shall be sealed by an professional engineered registered in the State of the
                  Project Location.

      F.   Samples of aggregates shall be furnished by the Contractor as required, together with tests for
           hardness, durability, density, absorption, etc., referenced in ASTM C 33.

      G.   Certificates: Each load of ready mixed concrete shall be accompanied by triplicate certificates
           (batch tickets) submitted for approval for each batch discharged indicating project identification
           name and number, mix type, and listing ingredients, including quantities and types of
           admixtures, total water, time when water was introduced into the mix, place and date of delivery,
           amount of concrete in cubic meters, mix time, reading of revolution counter at first addition of
           water, etc. Identify separately amounts of water added at batch plant and water added on site.

      H.   Completed pre-pour sign-off cards.


      A.   Comply with applicable provisions of Division 3 Section "Cast-In-Place Concrete".

INDUSTRIAL CONCRETE FLOOR SLABS                                                                03305 - 2 of 11
DaimlerChrysler                                                                    Construction Standards

   B.    Institute a "Concrete Pour Sign-Off Card" for the placement of concrete floor slabs on grade.
         1.      Sign-Off Card shall, at a minimum, consist of a checklist for verification of the following
                 a.     Compaction of subgrade and subbase materials and subgrade elevation.
                 b.     Installation of underground utilities.
                 c.     Installation of required reinforcing steel.
                 d.     Installation of miscellaneous steel embeds.
                 e.     Locations of shallow utilities have been reviewed by firm placing concrete.
                 f.     Floor drains, cleanouts, handholes, etc. have been set to required top elevations.
                 g.     Concrete forms have been set to specified elevation and level tolerances, and have
                        received form release agent application.
                 h.     Saw cutting equipment, additional lighting (if necessary) and wiring materials are
                        present on site.
         2.      Assign a superintendent who is designated to supervise concrete slab-on-grade
         3.      Prior to placing each section of concrete slab-on-grade the Contractor's superintendent
                 shall obtain signatures from the various trade subcontractors involved in the checklist
                 items mentioned above. After signatures are obtained, the Contractor's superintendent
                 shall sign the card as well.
         4.      Submit the original card to the Owner's Representative with copies to the
                 Architect/Engineer, concrete flooring installer, and other signatories to the cards.

   C.    Ready Mix Plant Qualifications: Plant experienced in furnishing ready mixed concrete similar to
         that indicated for this Project and with a record of successful in-service performance as well as
         sufficient production capacity to produce required quantity without delaying the Work. Plant shall
         have adequate storage and handling facilities for material and shall be equipped for accurate
         weighing, measuring, and control of materials, quantities, mixing, and delivery of concrete
         meeting specified requirements.

   D.    Preinstallation Conference: Prior to start of work, conduct conference at Project site with all
         parties associated with work of this Section. Notify participants at least 5 working days before
         1.     Meet with representatives of the Owner; Architect/Engineer; testing and inspecting
                agency; concrete producer; concrete slab installer/finisher; steel fiber manufacturer;
                admixture manufacturer; and others whose work interfaces with or directly affects floor
                slab placement.
         2.     Review methods and procedures related to work of this Section.
         3.     Examine subgrade conditions for compliance with requirements, including flatness and
                modulus of subgrade reaction.
         4.     Discuss plans to execute the work, scheduling, equipment, assignments, and storage
         5.     Discuss the following as a minimum:
                a.     Concrete mix design and control of same.
                b.     Trial batching.
                c.     Subgrade and subbase preparation.
                d.     Placement procedures for:
                       1)     Form work
                       2)     Reinforcing
                       3)     Concrete placement methods
                       4)     Concrete finishing procedures
                       5)     Sawcut methods and timing
                       6)     Curing procedures
                       7)     Joint sealing
                       8)     Slab protection
         6.     Document proceedings, including corrective measures or actions required, and furnish
                copy of record to each participant.

INDUSTRIAL CONCRETE FLOOR SLABS                                                             03305 - 3 of 11
DaimlerChrysler                                                                     Construction Standards


      A.   Protection.
           1.    Forms and steel shall be entirely free of frost, snow or ice before placing concrete.
           2.    Protect concrete work from damage by frost or freezing or from any other cause.
                 Aggregate and mixing water shall be heated before mixing concrete when the outside
                 temperature is 40 deg F or lower and falling and shall have a temperature at placing of
                 60 deg F minimum and 80 deg F maximum.
           3.    Placed concrete shall be fully protected from frost and freezing by approved means in
                 accordance with the applicable requirements of ACI 306. The use of "anti-freeze"
                 additives or admixtures is prohibited. Concrete shall be provided with curing protection
                 for a period of seven days against outside temperatures of 50 deg F and lower.
           4.    In hot weather concrete shall be placed in accordance with the applicable requirements of
                 ACI 305.
           5.    Remove protection when directed or no longer required. Damaged concrete shall be
                 removed and replaced at no additional cost to the Owner.
           6.    Size, extent, and details of concrete pours shall be reviewed with the Owner’s
                 Representative before concrete is placed.


2.1        MATERIALS

      A.   Forms shall be constructed in accordance with the requirements of ACI 347.
           1.   Form coating shall be an approved nonstaining type.

      B.   Reinforcement
           1.    Fibers: Steel fibers conforming to ASTM A 820, Type I, deformed, cold drawn steel wire
                 with a minimum tensile strength of 130,000 psi; minimum aspect ratio of 65; minimum
                 length 2 inches, nominal diameter 0.0351 inches.
                 a.     Basis-of-Design Product: The design is based on Bekaert; Dramix RC65/60BN.
                        Subject to compliance with requirements, provide either the named product or a
                        comparable substitute acceptable to the Owner.
           2.    Reinforcing steel and dowels shall be new billet steel conforming to ASTM A 615
                 grade 60.
           3.    The details of reinforcing steel shall conform to ACI 315. Furnish required metal
                 accessories, including spacers, chairs, ties, etc. Cut and bend reinforcement in
                 accordance with the approved shop drawings and bar lists.

      C.   Steel Dowels: ASTM A 615, Grade 60. Furnish smooth dowels at floor slab construction joints.

      D.   Column Isolators: 20 gage sheet metal with Z275 galvanized coating to ASTM A 525.

      E.   Chairs and Spacers: Rigid type, of sufficient strength to rigidly support weight of reinforcement
           and construction loads. Use non-corrosive type over metal deck. Use precast concrete chairs
           with embedded tie wires for support of bottom and top reinforcing steel bar in slabs on grade.
           1.    Drummond and Reeves Ltd.
           2.    Acrow Richmond
           3.    Superior Concrete Accessories Ltd.

      F.   Portland Cement: ASTM C 150, Type I.

      G.   Slag Cement: ASTM C 989, Grade 120.

      H.   Aggregates shall conform to ASTM C 33 and having a petrographic number no greater than

INDUSTRIAL CONCRETE FLOOR SLABS                                                             03305 - 4 of 11
DaimlerChrysler                                                                      Construction Standards

         1.       Fine aggregate shall be natural sand, sharp and clean.
         2.       Coarse aggregate shall be crushed, hard, dense, durable natural stone or crushed and
                  processed air cooled blast furnace slag, free of any mud, clay, loam, silt or organic matter
                  graded to a balanced mix of 50 percent passing a 1-1/2 inches size sieve and 50%
                  passing 3/4 inches size sieve (50/50 blend).

   I.    Water shall be clean and free from injurious amounts of oil, alkali, acids, organic matter and
         other deleterious substances.

   J.    Use admixtures where necessary to achieve acceptable final product regarding Concrete
         workability; entrained air content; handling; and design strength criteria. Admixtures shall
         conform to ASTM C 494. Admixtures which may cause increased concrete shrinkage shall not
         be permitted. Additional criteria is as follows:
         1.    Superplasticizer: Unless otherwise directed by the Owner, provide one of the following:
               a.     Eucon 37; Euclid Chemical Co.
               b.     Rheobuild 1000; Master Builders
               c.     Sikament; Sika Chemical Corp.
         2.    Water Reducing Agents: The type of water reducing agent shall be dependent upon the
               conditions encountered and shall be in accordance with manufacturer's
               recommendations. Mid-range water reducers shall not be used. Unless otherwise
               directed by the Owner, provide one of the following:
               a.     Plastocrete; Sika Corp.
               b.     Eucon WR or Eucon WR 75; Euclid Chemical Co.
               c.     Owner approved substitute.
         3.    Admixtures shall be liquid-type premixed by the manufacturer and used directly from
               containers bearing the label of the Manufacturer. The quantity shall be only that amount
               required to conform to the approved requirements as shown by the final approved design
               mix. The addition of admixture shall be made by accurate dispenser for positive control of
               the quantity as approved.
         4.    Fly ash admixtures, chloride-based admixtures, and calcium chloride thiocyanates shall
               not be used. Admixtures containing more than 0.05 percent chloride ions shall not be
               used. Products which individually or collectively contribute more than 5 ppm by weight of
               chloride ions to concrete shall not be used.

   K.    Premolded expansion joint fillers at interior joints. Unless otherwise directed by the Owner,
         provide one of the following:
         1.    Ceramar, W.R. Meadows Sealtight.
         2.    Approved substitute.

   L.    Isolation joint fillers at locations indicated. Material specifically designed and manufactured to
         provide isolation from ambient and induced shock and vibration. Unless otherwise directed by
         the Owner, provide one of the following:
         1.      FABSORB Foundation Isolation Material, Fabreeka International
         2.      Approved substitute.

   M.    Floor Sealer/Hardener/Densifier: Clear penetrating water-based siliconate or silicate solution
         specifically designed to penetrate, harden, and densify concrete to protect concrete floors
         against abrasion, dusting, and absorption of liquids. Unless otherwise directed by the Owner,
         provide one of the following:
         1.     Intraseal; Conspec (NPM code: 65-060-0690).
         2.     Diamond Hard; Euclid Chemical.

   N.    Epoxy bonding agent for bonding freshly mixed concrete to hardened or existing concrete.
         Unless otherwise directed by the Owner, provide one of the following:
         1.    Armatec 110; Sika Chemical Corp.
         2.    Powerprep AC; Sto Powercrete
         3.    Corr-Bond; Euclid Chemical Co.

INDUSTRIAL CONCRETE FLOOR SLABS                                                               03305 - 5 of 11
DaimlerChrysler                                                                     Construction Standards

      O.   Epoxy Floor Fill: Trowel applied epoxy mortar system designed to surface and fill floor slabs up
           to 2 inches thickness.
           1.     Products:     Unless otherwise directed by the Owner, provide Euco #456 Mortar, Euclid
                  Chemical Co , or similar product by one of the following:
                  a.     Euclid Chemical Co.
                  b.     Master Builders, Inc.
                  c.     Sika Corp.

      P.   Joint Selants: Multicomponent Flexible epoxy joint sealant or polyurea having durometer not
           less than 70, Shore A. Unless otherwise directed by the Owner, provide one of the following:
           1.     Flexible joints at column isolation joints and wall Intersections:
                  a.     Euco 700 or Euco 700 Special; Euclid Chemical Co.
           2.     For all areas not otherwise specified, provide the following in a gray color.
                  a.     Sonneborn, Division of ChemRex Inc.; Sonolastic TF-100.

2.2        MIX DESIGN

      A.   Design mix shall be prepared and sealed by the Contractor's professional engineer for each type
           of concrete specified. The design mix shall consist of admixture(s), aggregate gradation,
           proportion of materials per cubic yard, slump at pour, compressive strength cylinders of test
           batch concrete tested at three days, seven days and 28 days, and any other data pertinent to the
           material proportions and mixing to obtain and control the quality of the concrete throughout the
           job. The design mix shall show the percentage of air required and the quantity of water reducing
           agent permissible for each section of the work.
           1.    The materials shall be selected and mixed in proportions as required, conforming to
                 ACI 301 and ACI 302 to develop concrete with a minimum compressive strength at the
                 end of 28 days and slump at pour as follows, unless specifically otherwise noted:
                 a.     Slab on Grade: 4,000 psi, minimum compressive strength when tested per ASTM
                        C 39.
                 b.     Slump shall range from 2-3/8 inches to 3-5/8 inches, unless otherwise noted, as
                        measured before any superplasticizer is added.
           2.    Type I cement.
           3.    Limit percentage, by weight, of slag cement in concrete to 25 percent maximum
                 replacement of Portland cement.
           4.    Approved water reducing agents may be used in the mix design.
           5.    Fly ash admixtures, chloride-based admixtures, and calcium chloride thiocyanates shall
                 not be used. Mid-range water reducers shall not be used. Admixtures containing more
                 than 0.05 percent chloride ions shall not be used.
           6.    Maximum sizes of coarse aggregate shall conform to ASTM C 33.
           7.    The water-cement ratio and strength shall not exceed 0.48.
           8.    Verify strength, slump and other design values in accordance with ACI 211. If during
                 placement, slump or other field sampled tests produce questionable results, the
                 Contractor shall have additional testing performed to satisfy the on-site testing
                 representative. Any material not in conformance with approved values shall be removed
                 from site at Contractors expense.
           9.    Slump at arrival on site prior to addition of steel fibers and superplasticizer shall be
                 3 inches plus or minus 5/8 inches, except as specified otherwise.
           10.    Add steel fiber reinforcement into the slab mix at a rate of not less than 50 lb/cu yd
                 unless directed otherwise. Add super-plasticizer as required prior to or concurrently with
                 loading and mixing steel fibers.
           11.   Durability as determined by one of the following methods:
                 a.     Minimum R10,50 toughness rating of steel fiber reinforced concrete in accordance
                        with ASTM C 1018 shall be 65.
                 b.     Minimum Re,3 equivalent residual strength ratio of steel fiber reinforced concrete in
                        accordance with TR #34 shall be 60.

2.3        MIX METHOD

INDUSTRIAL CONCRETE FLOOR SLABS                                                              03305 - 6 of 11
DaimlerChrysler                                                                        Construction Standards

      A.   Ready mixed concrete shall be in accordance with Contract requirements and meeting
           applicable requirements of ASTM C 94 and ASTM C 1116.
           1.     The ready mix trucks shall be in good condition, kept clean of hardened concrete and
                  other foreign materials in injurious amounts. Schedule delivery of the concrete to avoid
                  delays in placing after mixing or holding dry mixed materials too long in the mixer prior to
                  adding mix water at location of pour. The correct quantity of water shall be contained in
                  the mixer and adding additional water at the pour location shall not be permitted.
           2.     No water from the truck water system or elsewhere shall be added after the initial
                  introduction of mixing water for the batch except when on arrival at the job site the slump
                  of the concrete is less than specified. If additional water is added the drum shall be
                  turned an additional 30 revolutions, minimum.
           3.     In cold weather below 40 deg F, discharge of the concrete shall be completed within 90
                  minutes, or before the drum has revolved 300 revolutions, whichever comes first after the
                  introduction of the mixing water to the cement and aggregates. In hot weather above
                  70 deg F, or under conditions contributing to quick stiffening of the concrete this time limit
                  shall be 70 minutes.
           4.     Concrete delivered in cold weather shall have applicable minimum temperatures as
                                                               Minimum Concrete Temp. Deg F
                               0 to 32                          65                             56
                              Below 0                           70                             61
           5.     In hot weather the producer shall deliver the ready mixed concrete at concrete
                  temperatures as low as practicable, subject to approval by the Owner’s Representative.
           6.     The adding of water reducing agents shall be performed as required and with the control
                  and record data as specified. Reduction in cement content shall not be allowed because
                  of higher strengths attained due to admixtures.
           7.     After checking slump, "Steel Fibers" and/or superplasticizer must be placed into mix at
                  jobsite, with one additional adjustment to mix, before any other quality assurance tests
                  are performed.
           8.     Add steel fibers to the mixer after other ingredients, including water, have been added
                  and mixed at a maximum rate of 100 pounds per minute and in a clump free state.
           9.     Reduce mixer to the recommended speed, as determined by the steel fiber manufacturer,
                  and allow at least 5 minutes mixing time with a minimum of 40 revolutions.


3.1        PREPARATION

      A.   Place a 1/2 inch choker course of limestone screenings over top of granular fill sub-base.
           Prepare and grade choker course ahead of slab pour.

      B.   Roll choker course with heavy steel wheeled rollers.

      C.   Rake choker course smooth of any truck tire marks and lightly dampen subbase immediately
           prior to concrete placement.

      D.   Verify that asphaltic paint has been applied to steel columns at locations indicated.


      A.   Place reinforcement and accessories per requirements of CRSI “Placing Reinforcing Bars.”
           Reinforcing shall be rust free and cleaned of dirt, ice, snow and any other surface contaminates.
           Heat bending shall not be permitted.

      B.   Unless otherwise shown on the Drawings, concrete covering over reinforcement steel shall be
           as specified in Division 3 Section "Cast-In-Place Concrete."

INDUSTRIAL CONCRETE FLOOR SLABS                                                                 03305 - 7 of 11
DaimlerChrysler                                                                         Construction Standards

      C.   Place chairs, ties, bolsters and spacers required to properly install the reinforcement.

      D.   Except as otherwise noted, steel fibers shall be the reinforcement for the main floor slab-on-


      A.   Forms shall be erected to the exact lines and elevations, and shall be carefully checked
           immediately prior to the placing of concrete. Forms shall be constructed in accordance with the
           requirements of ASTM A 347. Form coating (release agent) shall be applied prior to installation
           of reinforcing steel.

      B.   Conduit, anchors, pipe sleeves, embedments, and other built-in materials shown or specified to
           be set in concrete shall be accurately located in accordance with approved shop drawings.

      C.   Clean forms of debris and secure approval of Owner's Representative before concrete is placed.
           Formwork acceptable for placing of concrete shall be protected until concrete is poured.

      D.   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 or directed.
           1.     Extend joint-filler strips full width and depth of joint, terminating not less than 1/2 inch or
                  more than 1 inch below finished concrete surface.
           2.     Install joint-filler strips in lengths as long as practicable. Where more than one length is
                  required, lace or clip sections together.


      A.   Forms shall be thoroughly clean, reinforcing steel in position, sleeves, anchor bolts,
           embedments, miscellaneous metals and other built-in items shall be securely positioned in final
           location, safe against displacement, prior to placing any concrete in the forms. Forms shall be
           thoroughly wetted before placing concrete.

      B.   Before concrete is placed wet down subbase leaving it damp but without standing water. If any
           anchor bolts are placed, base plate template and anchor bolts shall be set in place and optically
           aligned; recheck after completion of pour.

      C.   Concrete shall be conveyed from the mixer to the forms and in final position as rapidly as
           possible by inclined chutes, buggies or other approved methods to prevent segregation or loss
           of the materials. Concrete shall be worked along the forms, along and around reinforcing steel,
           into corners and continuously spaded and tamped during placing to prevent voids forming in the

      D.   The concrete shall be vibrated by conscientious and well trained operators with approved
           internal mechanical vibrators sufficient to work concrete around embedded items, steel,
           additional reinforcement, and into corners but with care to avoid vibration to the extent of
           causing separation or segregation of the concrete materials and who understand when concrete
           is adequately consolidated.
           1.     Consolidate concrete during placement operations so concrete is thoroughly worked
                  around reinforcement and other embedded items and into corners.
           2.     Screed slab surfaces with a 20 foot straightedge and strike off to correct elevations.
                  a.     Screed in 2 directions, 90 degrees tangent to each other.
           3.     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.

INDUSTRIAL CONCRETE FLOOR SLABS                                                                 03305 - 8 of 11
DaimlerChrysler                                                                       Construction Standards

      E.   After a level surface has been attained the vibrator should be inserted vertically at uniform
           spacing over the entire area of placement. The distance between insertions shall be about 1-1/2
           times the radius of action, or such that the area visibly affected by the vibrator overlaps the
           adjacent just-vibrated area by a few inches.

      F.   Laser Screed: To achieve rigid tolerances for scheduled areas, utilize a laser guided concrete
           placing and screeding machine having proven capabilities to place concrete within the specified
           tolerances and be acceptable to the Owner.


      A.   Concrete slabs shall be brought to proper lines of level or pitch by screeding, power floating or
           troweling; remove humps and hollows to produce true, even surfaces. Concrete floor slabs to
           remain exposed or receive resilient tile or carpeted finish shall have steel trowel finish. Slabs to
           receive polished finish, hard tile, liquid or trowel applied flooring shall be floated level.
           1.     Float Finish: Consolidate surface with floats. Level, cut down high spots, and fill low
                  spots. Repeat float passes and leveling until surface is left with a uniform, smooth,
                  granular texture.
           2.     Trowel Finish: After applying float finish, apply first troweling and consolidate concrete by
                  hand or power-driven trowel. Continue troweling passes and leveling until surface is free
                  of trowel marks and uniform in texture and appearance.

      B.   Tolerance adherence: Final work which is found to exceed tolerance limits as specified shall be
           removed and replaced at no additional cost to Owner.

      C.   Saw cut control joints of slab-on-grade to be 1/3 the thickness of the slab with a "Softcut G2000"
           saw at locations indicated on the Drawings, as soon as slab surface will bear the sawcut
           equipment and operator without damage (generally within 8 to 10 hours of pour).
           1.    After slab has cured for 7 days, fill sawcuts with fine sand or other approved material.
           2.    After minimum of 120 days, vacuum sand from joints, clean and fill joints in traffic aisles
                 and dock areas with sealant.
           3.    Tape exposed slab edges and fill joints with backer and sealant.

      D.   Saw cut construction joints to 1/3 the thickness of the slab using wet diamond blades. Begin
           sawcutting prior to time initial shrinkage crackes develop but not more than 8 hours after
           placement. Completely remove concrete and slurry resulting from sawcutting operations from
           groove and from slab surfaces. Repair raveling and spalling along joint as directed by

      E.   Place epoxy floor fill in slab voids where indicated. Strike fill area smooth to adjacent surfaces
           and steel trowel finish. Protect and cure as recommend by system manufacturer.

3.6        TOLERANCES

      A.   Concrete in place shall be plumb, level and true to linear building lines. Maximum variations (not
           accumulative) shall conform to ACI Standards.

      B.   Slab Thickness: Completed slab shall not have thickness less than that specified, and not
           greater than 1/4 inch.

      C.   Slab Flatness & Levelness: Finish surfaces to the following tolerances, measured within 24
           hours according to ASTM E 1155/E 1155M for a randomly trafficked floor surface:
           1.    Trowelled Finish: Overall values of flatness, F(F) 38; and levelness, F(L) 25; with
                 minimum local values of flatness, F(F) 26; and levelness, F(L) 17.
                 a.    Where laser screeding is not used, or between different pours, finish and measure
                       surface so gap at any point between concrete surface and an unleveled,

INDUSTRIAL CONCRETE FLOOR SLABS                                                                03305 - 9 of 11
DaimlerChrysler                                                                        Construction Standards

                         freestanding, 10-foot-long straightedge resting on 2 high spots and placed
                         anywhere on the surface does not exceed 1/8 inch
           2.     Float or Scratched Finish: Specified overall values of flatness, F(F) 15; and levelness,
                  F(L) 13; with minimum local values of flatness, F(F) 10; and levelness, F(L) 9.
           3.     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.

      D.   Tolerances for placing embedded items shall conform to AISC Code of Standard Practices,
           Section 7.5.

      E.   A permitted variation in any part of the construction or in any Section of Specification shall not be
           construed as permitting violation of more stringent requirements for any other part of
           construction or in any other Specification Section.


      A.   Thoroughly and completely cure and seal as specified. Fully protect freshly placed concrete
           from the elements including drying by the sun and wind, and wash by rain.

      B.   Start initial curing as soon as free water has disappeared from concrete surface after placing
           and finishing. Weather permitting, keep continuously moist for not less than 7 days.

      C.   Slabs-on-grade shall be wet cured by use of water fogging covered by burlap cloth made from
           jute or kenaf, weighing approximately 9 oz./sq yd dry, white burlap-polyethylene sheet or other
           type of moisture retaining blanket approved by the Owner's Representative.

      D.   Curing methods during hot weather shall be accordance with the provisions of ACI 305.

      E.   Curing methods during cold weather, protect concrete from freezing and cure in accordance with
           ACI 306 requirements.

      F.   No curing and sealing compound or method shall be used which will impair bond or penetration
           of subsequently applied finishes or materials. Coordinate with material manufacturers.

      G.   Prohibit pedestrian traffic from newly placed slabs for a minimum of 24 hours. Prohibit vehicular
           and other construction traffic from newly placed slabs for a minimum of 7 days and until after
           joints have been filled with loose, fine sand.


      A.   Exposed surfaces of floors, pits and trenches shall receive a liquid sealer/hardener/densifier
           applied in accordance with manufacturer's instructions.
           1.    Apply to all new concrete surfaces immediately after trowel finish or removal of forms.
           2.    On surfaces not receiving polish finish, such as pits and trenches, apply second coat after
                 7 day cure. Do not applysecond coat to concrete that is less than 7 days old.


      A.   General: Employ a testing agency to perform tests and to submit test reports.

      B.   Test each continuous pour with not less than one test per day or not less than one test for each
           150 cubic yards of concrete, except as otherwise required and approved. Each test shall consist
           of three specimen cylinders, with specimen cylinders cured at the laboratory. One of the cured
           specimen cylinders shall be tested at seven days and two at 28 days, and the 28 day test shall
           show not less than specified strength. Each 28 day cylinder shall show not less than the

INDUSTRIAL CONCRETE FLOOR SLABS                                                               03305 - 10 of 11
DaimlerChrysler                                                                     Construction Standards

         designed strength and the average of the cylinders shall show not less than 115% of the design
         strength. Provide casual labor and extend full cooperation as required.

   C.    Sampling, molding, curing and testing of cylinders shall conform to ASTM C 31.

   D.    Slump tests shall be made at the jobsite and written results shall be submitted for approval per
         ASTM C 143.

   E.    Where concrete does not conform to these requirements the Contractor may be required to
         provide the following at his own expense:
         1.    Complete plant inspection by testing agency.
         2.    Test of hardened concrete.

   F.    Testing for Flatness & Levelness shall be performed in conformance with ASTM E 1155 and a
         written report submitted to the Owner’s Representative.

   G.    Non-Compliant Test Reports:          Test reports indicating non-compliance shall be faxed
         immediately to all parties on the test report distribution list. Follow with mailed hard copies.


   A.    Fill in holes and openings left in concrete for steel, piping, sleeves and other work. Such parts
         shall be filled with concrete after the work of others is in place. Fillings shall be neat and flush
         with adjacent surfaces.

   B.    After placing and setting of concrete, clean exposed portion of anchor bolts with a wire brush.

   C.    Provide other miscellaneous concrete filling as required to complete the work.

   D.    Set anchor bolts accurately to template and optically check; recheck anchor bolts after setting
         and correct errors, which exist in this work.

                                           END OF SECTION

INDUSTRIAL CONCRETE FLOOR SLABS                                                            03305 - 11 of 11

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