SECTION 03470

TILT-UP PRECAST CONCRETE

PART 1 GENERAL

SECTION INCLUDES

Tilt-up, site cast concrete wall panels, [load] [non-load] bearing, erected from mold to final position [with integral insulation].

Supports, devices, [load bearing supports,] and attachments.

Calking of intermediate [and perimeter] joints.

[Grouting under panels].

PRODUCTS FURNISHED BUT NOT INSTALLED UNDER THIS SECTION

Section [_____-__________]: Placement of anchorage [embedding into] [placing in] [welding to] building structure components.

Section [______-____________]: Placement of panel base bearing plates in concrete [floor edge] [top of foundation].

PRODUCTS INSTALLED BUT NOT FURNISHED UNDER THIS SECTION

Section [_____-__________]: Supply of metal flashing reglets for placement by this Section.

RELATED SECTIONS

Section 03300 - Cast-In-Place Concrete: [Floor slab] [Foundation] bearing support.

Section [______-____________]:	Back-up masonry.

Section 05120 - Structural Steel: Building structural frame.

Section 07900 - Joint Sealers: Perimeter and intermediate joint sealants and backing.

Section [______-____________]: [Windows] [Glass] [Door frames] [________] site installed in tilt-up units.

Section [______-____________]:	Applied exterior finish.

Section [______-____________]: Conduit and boxes for [light fixtures] [________].

REFERENCES

ANSI/ACI 301 - Specifications For Structural Concrete for Buildings.

ANSI/ACI 318 - Building Code Requirements for Reinforced Concrete.

ANSI/ASTM A36 - Structural Steel.

ANSI/ASTM A185 - Welded Steel Wire Fabric for Concrete Reinforcement.

ANSI/ASTM A307 - Carbon Steel Externally Threaded Standard Fasteners.

ANSI/ASTM A386 - Zinc Coating (Hot-Dip) on Assembled Steel Products.

ANSI/ASTM A666 - Austenitic Stainless Steel, Sheet, Strip, Plate, and Flat Bar for Structural Applications.

ANSI/ASTM C31 - Making and Curing Concrete Test Specimens in the Field.

ANSI/ASTM C143 - Test for Slump of Portland Cement Concrete.

ANSI/ASTM C150 - Portland Cement.

ANSI/ASTM C260 - Air-Entraining Admixtures for Concrete.

ANSI/ASTM C330 - Lightweight Aggregates for Structural Concrete.

ANSI/AWS D1.1 - Structural Welding Code.

ASTM A325 - High Strength Bolts for Structural Steel Joints.

ASTM C615 - Deformed and Plain Billet-Steel Bars for Concrete Reinforcement.

ASTM C33 - Concrete Aggregates.

PCI - Manual for Structural Design of Architectural Precast Concrete.

PCI MNL-116 - Manual for Quality Control for Plants and Production of Precast and Prestressed Concrete Products.

PCI MNL-120 - Design Handbook - Precast and Prestressed Concrete.

PCI MNL-123 - Manual on Design of Connections for Precast Prestressed Concrete.

DESIGN REQUIREMENTS

Design units to withstand design loads [as calculated in accordance with [________] code,] and erection forces. Calculate structural properties of units in accordance with [ACI 301] [ANSI/ACI 318].

Design units to accommodate construction tolerances, deflection of building structural members and clearances of intended openings.

[Design and size components to withstand seismic loads and sway displacement as calculated in accordance with [________] code.]

Design component connections to accommodate building movement and thermal movement. Provide adjustment to accommodate misalignment of structure without unit distortion or damage.

[Insulated tilt-up precast units to achieve "R" value of [____.] (RSI of [____].)

SUBMITTALS

Submit under provisions of Section [01300] [________].

Shop Drawings: Indicate layout, tilt-up unit locations, configuration, [unit identification marks,] [reinforcement,] connection details, support items, [location of lifting devices,] dimensions, openings, and relationship to adjacent components.

Samples:	Submit [two] [_______] panels, [____x____] inch ([____x____] mm) in size illustrating surface finish, color and texture.

Mix Design: Submit proposed mix design under provisions of Section [01400] [01410] before starting work.

QUALITY ASSURANCE

Perform Work in accordance with PCI MNL-116, PCI MNL-123, PCI MNL120, [PCI Manual For Structural Design of Architectural Precast Concrete,] [ANSI/ACI 318,] [and] [________________].

Welding: ANSI/AWS D1.1.

Maintain [one copy] [[____] copies of [each] document on site.

QUALIFICATIONS

Fabricator: Company specializing in performing the work of this Section with minimum [__________] years [documented] experience.

****** [OR] ******

Precast Fabricator and Erectors:	Qualified in accordance with PCI MNL-116.

Design units under direct supervision of a Professional Structural Engineer experienced in design of this work and licenced [at the place where the Project is located] [in the State of [____________]].

Welder: Qualified within previous [12] [____] months in accordance with ANSI/AWS D1.1 and ANSI/AWS D1.4.

MOCKUP

Provide mockup of full size panel under provisions of Section [01400] [________].

Mockup panel to include lifting devices, anchor devices, [window,] [glazing,] [door frames,] [calking] [and] [________].

Locate [where directed] [__________________________].

Mockup may [not] remain as part of the Work.

PRE-INSTALLATION CONFERENCE

Convene [one] [_____] week prior to commencing work of this Section, under provisions of Section [01039] [________].

HANDLING

Protect and handle products under provisions of Section [01600] [________].

Handle tilt-up units to position, consistent with their shape and design. Lift and support only from support points.

Lifting or Handling Equipment: Capable of maintaining units during manufacture, erection, and in position for fastening.

Blocking and Lateral Support During Erection: Clean and non-staining, without causing harm to exposed surfaces. Provide temporary lateral support to prevent bowing and warping.

Protect units from staining, chipping, or spalling.

FIELD MEASUREMENTS

Verify that field measurements are as [indicated on [shop] Drawings] [instructed by the fabricator].

PART 2 PRODUCTS

ACCEPTABLE TILT-UP UNIT FABRICATORS

[__________________________________].

[__________________________________].

[__________________________________].

Substitutions: Under provisions of Section [01600] [________].

CONCRETE MATERIALS

Cement: ANSI/ASTM C150, Portland Type [I - Normal] [III -High Early Strength] [II - Sulphate Resisting]; [white] [gray] [buff] color.

Concrete Materials: [ASTM C33] [ANSI/ASTM C330]; water and sand.

Reinforcing Steel: [ASTM A615, deformed steel bars] [ANSI/ASTM A185, welded steel wire fabric] [ANSI/ASTM A416, prestressing strand]; [plain] [galvanized] [epoxy] finish, strength and size commensurate with tilt-up unit design.

Air Entrainment Admixture:	ANSI/ASTM C260.

Admixtures: [___________________________].

Surface Finish Aggregate: Clean, [washed,] [angular] [smooth] [________] natural [gravel] [quartz] [granite] [limestone] [marble] [________]; [____] inch ([____] mm) size, [________] color, from single source throughout the Work [, conforming to ASTM C33].

****** [OR] ******

Surface Finish Aggregate: Conforming to sample [in office of Architect/Engineer] [________].

[Pigment] [Coloring Agent]: [________] type, [________] color resistant to alkalis; [________] manufactured by [________________].

Surface Retarder: [________] manufactured by [________________].

Form Bond Breaker:	[________] manufactured by [________________].

Curing Compound: [________] manufactured by [________________].

Grout: [Non-shrink] [Normal], minimum [10,000] [____] psi ([70] [____] MPa), 28 day strength.

****** [OR] ******

Grout:	Thermo-setting epoxy.

SUPPORT DEVICES

Connecting and Support Devices: [ANSI/ASTM A36 [weldable] [general construction] steel] [ANSI/ASTM A666, Grade [____] Type [304] [____] stainless steel].

Bolts, Nuts, and Washers: [ANSI/ASTM A307] [ASTM A325], [high strength steel] [high strength alloy steel] [chromium nickel steel alloy].

Primer: [Zinc rich oil alkyd] [________________].

ACCESSORIES

Integral Insulation:	Rigid [extruded polystyrene] [expanded polystyrene] [polyurethane] [________] insulation, [[________] thick] [value R of [____] (RSI of [____])]; [________] manufactured by [________________].

****** [OR] ******

Integral Insulation:	Rigid [extruded polystyrene] [expanded polystyrene] [polyurethane] [________] insulation, specified in Section [07212] [________].

Bearing Pads: [High density plastic] [Steel], [1/8] [____] inch ([3] [____] mm) thick, smooth both sides] [Vulcanized elastomeric compound molded to size] [Neoprene (Chloroprene)] [Tetrafluoroethylene(TFE)] [________].

Recessed Reglets: [Galvanized steel] [Stainless steel] [Plastic], shaped and flanged to remain in place once cast, [foam plastic filled] [taped closed] to eliminate wet concrete intrusion.

Sealant: [________] type specified in Section 07900.

MIX

Concrete: Minimum [4000] [____] psi ([28] [____] MPa), 28 day strength, air entrained to [5 to 7] [________] percent [in accordance with ANSI/ACI 301].

FINISH - SUPPORT DEVICES

Clean surfaces of rust, scale, grease, and foreign matter.

Prime paint in [one coat] [two coats], except surfaces in direct contact with concrete or requiring field welding.

****** [OR] ******

Galvanize after fabrication to [2.0] [____] oz/sq ft ([610] [____] g/sq m) in accordance with ANSI/ASTM A386.

PART 3 EXECUTION

EXAMINATION

Verify site conditions under provisions of Section [01039] [________].

Verify that building structure, anchors, devices, and openings are ready to receive work of this Section.

PREPARATION

Provide for erection procedures and induced loads during erection. Maintain temporary bracing in place until final support is provided.

Provide necessary hoisting equipment.

SITE FABRICATION

Fabrication procedure to conform to PCI MNL-116.

Maintain environmental records and quality control program during production of tilt-up units. Make records available upon request.

Use rigid molds, constructed to maintain tilt-up unit uniform in shape, size and finish.

Maintain consistent quality during manufacture.

Fabricate connecting devices, plates, angles, [items fit to steel framing members,] inserts, bolts, and accessories. Fabricate to permit initial placement and final attachment.

Embed reinforcing steel, anchors, inserts plates, angles, and other cast-in items as indicated on [shop] Drawings.

Cast rigid insulation into units. Cut drainage channels in exterior face of insulation to route moisture to exterior. Maintain drainage channels clear.

Place recessed flashing reglets [provided by Section [________]] continuous and straight.

Locate hoisting devices to permit removal after erection.

Cure units to develop concrete quality, and to minimize appearance blemishes such as non-uniformity, staining, or surface cracking.

[Minor patching is acceptable, providing structural adequacy and appearance of units is not impaired.]

FINISH - TILT-UP UNITS

Finish Type [A] [____]: Ensure exposed-to-view finish surfaces of tilt-up units are uniform in color and appearance.

Finish Type [B] [____]: Remove cement mortar from areas affected by aggregate retarder [as instructed by retarder manufacturer].

Finish Type [C] [____]: Sand blast exterior exposed-to-view tiltup unit surfaces to [[____] percent of unit aggregate surface] [light] [medium] [heavy] exposure]. Protect adjacent surfaces.

SITE FABRICATION TOLERANCES

Conform to [PCI MNL-117] [________________].

****** [OR] ******

Maximum Out of Square: [1/8] [____] inch in 10 feet ([1] [____] mm/m), non-cumulative.

Variation From Dimensions Indicated on [Shop] Drawings: Plus or minus [1/8] [____] inch ([3] [____] mm).

Maximum Misalignment of Anchors, Inserts, Openings: [1/8] [____] inch ([3] [____] mm).

Maximum Bowing of Units: Length of bow/ [360] [____].

Location of Reglets:	[1/4] [____] inch ([6] [____] mm) from true position.

QUALITY CONTROL AND TESTS

Provide [testing] [and] [analysis] of concrete mix under provisions of Section [01400] [________].

Take [____] concrete test cylinders for every [____] cu yds ([____] cu m) of concrete placed in accordance with ANSI/ASTM C31.

Take [____] slump tests for every [____] test cylinders in accordance with ANSI/ASTM C143

Take [one] [____] air entrainment test cylinders for each set of exterior concrete test cylinders taken.

[Take water absorption test in accordance with PCI MNL-117.]

ERECTION

Erect units without damage to shape or finish. Replace or repair damaged panels.

Erect members level and plumb within allowable tolerances.

Align and maintain uniform horizontal and vertical joints, as erection progresses.

When members require adjustment beyond design or tolerance criteria, discontinue affected work; advise Architect/Engineer.

[Fasten] [and] [weld] units in place. [Perform welding, including tack welds, in accordance with ANSI/AWS D1.1.]

Touch-up [field welds and] scratched or damaged [primed painted] [galvanized] surfaces.

Set vertical units dry, [without grout,] attaining joint dimension with lead or plastic spacers. [Grout pack base of unit.]

Exposed Joint Dimension:	[1/2] [____] inch ([12] [____] mm).

ERECTION TOLERANCES

Maximum Variation from Plane of Location: [1/4] [____] inch in 10 feet and [3/8] [____] inch in 100 feet ([2] mm/m and [3] [____] mm in 30 m), non-cumulative.

Maximum Offset from True Alignment Between Two Connecting Units: [1/4] [____] inch ([6] [____] mm).

Joint Tolerance:	Plus or minus [1/4] [____] inch ([6] [____] mm).

ADJUSTING

Adjust work under provisions of Section [01700] [________].

Adjust units so that joint dimensions are within tolerances.

PROTECTION

Protect units from damage.

Provide non-combustible shields during welding operations.

SCHEDULES

Main Entry Panels: Finish Type X, buff cement color, 30 percent exposure of brown aggregate, flat panel of 8 inch nominal thickness, integral insulation to achieve panel R value of 5.

Exterior Wall Panels: Finish Type Y, white cement color, 10 percent exposure of light brown aggregate, flat panel of 10 inch nominal thickness, integral insulation to achieve panel R value of 6.

END OF SECTION