Tcsq11304r0 Precast Concrete

PAGE NO. 2 OF 24 TCSQ11304R0/SZA

TRANSMISSION CONSTRUCTION STANDARD TCS-Q-113.04, Rev. 0

Date of Approval: December 17, 2007

TABLE OF CONTENTS

1.0 SCOPE 2.0 GENERAL REQUIREMENTS 3.0 APPLICABLE CODES AND STANDARDS 3.1 SASO SSA/COMPANY Standards 3.2 International Standards 4.0 MATERIALS 4.1 Concrete 4.2 Portland Cement 4.3 Aggregates 4.4 Water 4.5 Admixtures 4.6 Pozzolans, Fly Ash and Other Mineral Admixtures 4.7 Pigments 4.8 Self Consolidating Concrete (SCC) 5.0 STEEL REINFORCEMENT, EMBEDMENT AND CONNECTING MATERIALS 5.1 Reinforcing bars 5.2 Reinforcing Wires 5.3 Welded Wire Fabric 5.4 Epoxy Coated Rebar 5.5 Inserts, Embedments and Other Accessories 5.6 Joint Sealants and Joint Gaskets 5.7 Pipe Entry Connectors 5.8 Grout 5.9 Insulating Materials




6.0 CONSTRUCTION OF PRECAST UNITS 6.1 Formwork 6.2 Reinforcement 6.3 Embedded items 6.4 Placing Concrete 6.5 Curing 6.6 Stripping Products From Forms 6.7 Finishes and Markings 6.8 Tolerances 6.9 Samples 7.0 DELIVERY, STORAGE, AND HANDLING 7.1 Transportation of Precast Units 7.2 Inspection 7.3 Handling and Storage 7.4 Erection 7.5 Concrete Repairs 8.0 QUALITY CONTROL AND SAFETY REQUIREMENTS 8.1 Materials 8.2 Ready Mixed Concrete 8.3 Plant and Equipment 8.4 Evaluation and Acceptance 8.5 Samples 8.6 Fire Rating and Safety 9.0 SUBMITTALS 9.1 Material Test Reports 9.2 Design Mixes 9.3 Erection Drawings 9.4 Handling Procedures




1.0 SCOPE This Transmission Construction Standard includes the materials, construction, supply,

delivery, installation, and performance criteria of all operations in relation to the fabrication, erection, in-situ testing and approval of Precast Concrete components to be used in the system of Saudi Electricity Company (SEC) in Kingdom of Saudi Arabia.

This Standard does not include the Prestressed Precast Concrete products. The Precast Concrete components as required by the system of work in SEC include the

following types. If any other specific type of precast unit is required, the supplier shall submit the shop drawings and obtain the approval of the COMPANY Representative.

1.1 Structural Elements Beams Boundary Wall Panels Columns and Corbels Fences Foundations Hand Holes Hollow core slab units Load bearing Wall Panels Light weight Roof Panels Manholes Piles Pipes Septic Tanks Single and Double Tee Slabs Soak Pit and Dry Pit Stair Components with landing slabs Structural Roof Panels Structural pads Water tanks 1.2 Non-Structural Elements Channels, Pipes, Quadrants and Edgings Kerb Stones Non Load bearing Wall Panels (Architectural)-with and without insulation




2.0 GENERAL REQUIREMENTS 2.1 Concrete work shall be considered as Precast concrete if all or selected members are

cast in controlled conditions other than their final position in the structure. 2.2 Precast Concrete works shall be constructed true to lines, dimensions and details

shown on the approved shop drawings. 2.3 The mix design, mixing, delivery and testing of normal weight, ready-mixed

concrete for Precast Concrete works shall be governed by the requirements of SEC Transmission Material Standard 70-TMSS-03.

2.4 No material, regardless of its source, shall be incorporated in the WORK until

representative samples are taken and tested by a SEC approved independent laboratory and found acceptable.

2.5 Precast units shall be designed in accordance with the ACI 533 and produced by

plants having PCI plant configuration and SEC approval. 3.0 APPLICABLE CODES AND STANDARDS The latest revisions/amendments of the following Codes, Standards and Specifications are

intended as guidance in providing an acceptable level of quality of materials and practice. In case of conflict between these Standards and the text of this Standard, the latter shall govern.

3.1 SASO SSA/COMPANY Standards 3.1.1 SASO SSA 143 Portland Cement, Ordinary and Rapid Hardening

3.1.2 70-TMSS-03 Normal Weight Ready-Mixed Portland Cement Concrete 3.1.3 TCS-Q-113.03 Cast-In-Place Concrete 3.2 International Standards 3.2.1 ACI 201.2R Guide to Durable Concrete 3.2.2 ACI 117 Standard Specification for Tolerances for Concrete

Construction and Materials 3.2.3 ACI 211.1 Standard Practice for Selecting Proportions for Normal,

Heavyweight, and Mass Concrete 3.2.4 ACI 211.2 Standard Practice for Selecting Proportions for Structural

Lightweight Concrete




3.2.5 ACI 212.3R Chemical Admixtures for Concrete 3.2.6 ACI 216 Fire Resistance of Concrete and Masonry Construction

Assemblies 3.2.7 ACI 301 Specification for structural concrete for Buildings 3.2.8 ACI 304 Guide for Measuring, Mixing, Transporting and Placing

Concrete 3.2.9 ACI 318M Building Code Requirements for Reinforced Concrete 3.2.10 ACI 442 Concrete buildings to Lateral Forces 3.2.11 ACI 517 Recommended Practice for Atmospheric Pressure Steam

Curing of Concrete 3.2.12 ACI 523.2 Guide for Precast Cellular Concrete Floor, Roof And Wall

Units 3.2.13 ACI 533 Guide for Precast Concrete Wall Panels 3.2.14 ACI 550 Design Recommendations for Precast Concrete Structures 3.2.15 ACI 550.1 Emulating Cast-in-Place Detailing in Precast Concrete

Structures 3.2.16 ASTM A 82 Specification for Steel Wire, Plain, for Concrete

Reinforcement. 3.2.17 ASTM A123 Specification for Zinc (Hot Dip Galvanized) Coatings on

Iron and Steel Products 3.2.18 ASTM A153M Specification for Zinc Coating (Hot Dip) on Iron and Steel

Hardware 3.2.19 ASTM A 185M Specification for Steel Welded Wire Reinforcement, Plain,

for Concrete 3.2.20 ASTM A 416M Specification for Steel Strand, Uncoated Seven-Wire for

Prestressed Concrete 3.2.21 ASTM A 496M Specification for Steel Wire, Deformed, for Concrete

Reinforcement 3.2.22 ASTM A 615M Specification for Deformed And Plain Carbon Steel Bars

for Concrete Reinforcement




3.2.23 ASTM A641M Specification for Zinc-Coated (Galvanized) Carbon Steel Wire

3.2.24 ASTM A767M Specification for Zinc-Coated (Galvanized) Steel Bars for

Concrete Reinforcement 3.2.25 ASTM A775M Specification for Epoxy-Coated Steel Reinforcing Bars 3.2.26 ASTM A882M Standard Specification for Filled Epoxy-Coated Seven-

Wire Prestressing Steel Strand 3.2.27 ASTM A884M Specification for Epoxy Coated Steel Wire and Welded

Wire Reinforcement. 3.2.28 ASTM A910M Specification for Uncoated, Weldless, 2- and 3-Wire Steel

Strand for Prestressed Concrete 3.2.29 ASTM C 33 Specification for Concrete Aggregates. 3.2.30 ASTM C 39M Test Method for Compressive Strength of Cylindrical

Concrete Specimens 3.2.31 ASTM C 114 Test Method for Chemical Analysis of Hydraulic Cement 3.2.32 ASTM C 150 Specification for Portland Cement 3.2.33 ASTM C 260 Specification for Air Entraining Admixtures for Concrete 3.2.34 ASTM C 309 Specification for Liquid Membrane-Forming Compounds

for Curing Concrete 3.2.35 ASTM C 330 Specification for Lightweight Aggregates for Structural

Concrete 3.2.36 ASTM C 331 Specification for Lightweight Aggregates for Concrete

Masonry Units 3.2.37 ASTM C 332 Specification for Lightweight Aggregates for Insulating

Concrete 3.2.38 ASTM C 404 Specification for Aggregates for Masonry Grout. 3.2.39 ASTM C 443M Specification for Joints for Circular Concrete Sewer and

Culvert Pipe, Using Rubber Gaskets (Metric) 3.2.40 ASTM C 476 Specification for Grout for Masonry 3.2.41 ASTM C 478M Specification for Precast Reinforced Concrete Manhole

Sections




3.2.42 ASTM C 494M Specification for Chemical Admixtures for Concrete 3.2.43 ASTM C 496M Method of Splitting Tensil Strength of Cylindrical

Concrete Specimens 3.2.44 ASTM C 497M Test Method for Concrete Pipe, Manhole Sections, or Tile

(Metric) 3.4.45 ASTM C 618 Specification for Fly Ash and Raw or Calcined Natural

Pozzolan for use in Concrete 3.2.46 ASTM C 825 Specification for Precast Concrete Barriers 3.2.47 ASTM C 857 Practice for Minimum Structural Design Loading for

Underground Precast Concrete Utility Structures 3.2.48 ASTM C 858 Specification for Underground Precast Concrete Utility

Structures 3.2.49 ASTM C 887 Specification for Packaged, Dry, Combined Materials for

Surface Bonding Mortar 3.2.50 ASTM C 890 Practice for Minimum Structural Design Loading for

Monolithic or Sectional Precast Concrete Water and Wastewater Structures

3.2.51 ASTM C 913 Specification for Precast Concrete Water and Wastewater

Structures 3.2.52 ASTM C 915 Specification for Precast Reinforced Concrete Crib Wall

Members 3.2.53 ASTM C 920 Specification for Elastomeric Joint Sealants 3.2.54 ASTM C 923M Specification for Resilient Connectors Between

Reinforced Concrete Manhole Structures, Pipes and Laterals (Metric)

3.2.55 ASTM C 936 Specification for Solid Concrete Interlocking Paving Units 3.2.56 ASTM C 979 Specification for Pigments for Integrally Colored Concrete 3.2.57 ASTM C 990M Specification for Joints for Concrete Pipe, Manholes and

Precast Box Sections Using Preformed Flexible Joint Sealants (Metric)

3.2.58 ASTM C 1227 Specification for Precast Concrete Septic Tanks




3.2.59 ASTM C 1433M Specification for Precast Reinforced Concrete Box Sections for Culverts, Storm Drains, and Sewers (Metric)

3.2.60 ASTM C 1478M Specification for Storm Drain Resilient Connectors

Between Reinforced Concrete Storm Sewer Structures, Pipes and Laterals (Metric)

3.2.61 AWS D1.1 Structural Welding Code - Structural Steel 3.2.62 AWS D1.4M Structural Welding Code - Reinforcing Steel 3.2.63 CRSI Manual Manual of Standard Practice 3.2.64 NPCA Quality Control Manual for Plants 3.2.65 PCI MNL116 Manual for Quality Control for Plants and Production of

Precast and Prestressed Concrete Products 3.2.66 PCI MNL117 Manual for Quality Control for Plants and Production of

Architectural Precast Concrete Products 3.2.67 PCI MNL120 Design Handbook Precast and Prestressed Concrete 3.2.68 PCI MNL123 Design and Typical Details of Connections for Precast and

Prestressed Concrete 3.2.69 CRD-C621 Handbook For Concrete And Cement Standard

Specification For Packaged, Dry, Hydraulic-Cement Grout (Nonshrink)




4.0 MATERIALS 4.1 Concrete Concrete shall be as per 70-TMSS-03, including the Aggregates, Cement,

Admixtures and Water. The exposure conditions shall apply to the different components depending upon their location and positioning, and as specified in SOW/TS.

For lightweight concrete units, the recommendations as given in ACI 211.2 shall

apply. 4.1.1 Water- Binding Materials Ratio a. The details as given in 70-TMSS-03, shall apply for the exposure

conditions as detailed in the said Standard. b. Concrete that will be exposed to freezing and thawing shall contain

entrained air and shall have water- Binding Materials ratio as per 70-TMSS-03.

c. Concrete which will not be exposed to freezing, but which is required

to be watertight, shall have a water-Binding Materials ratio as per 70-TMSS-03, for concrete exposed to fresh water.

4.1.2 Air Content The air content shall be determined only for concrete exposed to freezing and

thawing conditions and shall be within the limits given in 70-TMSS-03. 4.1.3 Compressive Strength a. All concrete not subject to severe and very severe exposure conditions

shall develop a minimum compressive strength of 35 MPa (5,000 psi) in 28 days unless other strengths are designated on the drawings.

b. Concrete subject to severe and very severe exposure conditions and in

contact with soil shall be as defined in 70-TMSS-03, for severe exposure conditions.

4.2 Portland Cement Portland cement shall be as per ASTM C 150, Type I, Type III or Type V. Type I

and III white and buff Cement can also be used in case of Architectural Precast Concrete units where colors are specified.




4.3 Aggregates Aggregates shall be as per the details given in 70-TMSS-03, for the different areas of

the Kingdom of Saudi Arabia. Light weight aggregates shall satisfy ASTM C 33 and Light weight concrete

proportioning shall be as per ACI 211.2 4.4 Water Water shall satisfy the requirements of 70-TMSS-03, for mixing of concrete. 4.5 Admixtures Concrete admixtures shall satisfy the following Standards: 4.5.1 Water reducing, retarding, accelerating, high range water reducing ASTM C

494 4.5.2 Ground granulated blast furnace slag: ASTM C 989 4.5.3 Air-entraining: ASTM C 260. 4.6 Pozzolans, Fly Ash and Other Mineral Admixtures Pozzolans, silica fumes, fly ash and other mineral admixtures shall satisfy ASTM C

618 and the requirements of 70-TMSS-03. 4.7 Pigments The pigments shall satisfy ASTM C 979. They shall be inorganic, non-fading and

lime-resistant, subject to approval of SEC and shall not exceed 10% of weight of cement.

4.8 Self Consolidating Concrete (SCC) Use of Self Consolidating Concrete (SCC) for Precast Concrete Units may be

permitted upon approval by the COMPANY. Complete details of material, admixtures, aggregates, design mix, and method of placing shall be submitted along with the test and strength reports as required in 70-TMSS-03 and TCS-Q-113.03.




5.0 STEEL REINFORCEMENT, EMBEDMENTS AND CONNECTION MATERIALS All reinforcement, accessories and connection materials required shall be as per approved

shop drawings. Concrete reinforcement shall be steel bars or welded wire fabric, or a combination thereof.

Rebar shall be stored in such a place so as to prevent rusting. The following are minimum requirements for precast steel reinforcement, embedments and

connections; 5.1 Reinforcing Rebar and Ties The reinforcing rebars and ties shall be deformed or plain steel bars in conformance

with ASTM A 615. 5.2 Reinforcing Wire The reinforcing wires shall be in conformance with Plain Wire ASTM A 82 Deformed Wire ASTM A 496 Prestressed Steel Strand/Wire ASTM A 416, A 882, and ASTM A 910 5.3 Welded Wire Fabric Welded wire fabric shall be in accordance with: Plain Wire ASTM A 185 Deformed Wire ASTM A 497 5.4 Epoxy Coated Rebar Epoxy Coated Rebar shall be as per the following standards: Reinforcing Bars ASTM A 775 Wires and Fabric ASTM A 884




5.5 Inserts, Embedments and Other Accessories Concrete inserts, anchors, brackets and fasteners as indicated in shop drawings or

required for fabrication and installation shall be zinc coated or galvanized in accordance with ASTM A 123 or ASTM A 153 as applicable. The lift devices shall be suitably visible on the exposed surfaces.

All items embedded in concrete shall be of the type required for the intended task,

and meet the following standards: 5.5.1 Structural steel plates, angles, etc: ASTM A 36 5.5.2 Welded studs: AWS D1.1 5.5.3 Finishes (as required): a. Primer- as per 78-TMSS-03 b. Hot-dipped galvanized: ASTM A 153 c. Zinc-rich coating: self-curing, one component, sacrificial d. Cadmium coating: Manufacturers recommendations e. Stainless steel and painted inserts can be used after approval by SEC 5.5.4 Construction Requirements For Inserts and Embedments

Following conditions shall apply during work; a. All sleeves, inserts, anchor bolts, waterstops and other embedded

items shall be installed in accordance with the design drawings and supported against displacement.

b. Reinforcing steel bars, anchor bolts or other steel embedment shall

not be used as the means for grounding electrical equipment and shall not be tied to grounding neutral conductors, or any part of the lightning protection system.

c. Conduits, pipes and other items made from aluminum shall not be

embedded in structural concrete unless effectively coated to prevent aluminum concrete reaction. Corrosion inhibiting compound shall be applied at all dissimilar metals in contract.

d. Metallic sleeves are not allowed and anchor bolts shall not be in

contact with reinforcing steel




5.6 Joint Sealant and Joint Gaskets: 5.6.1 Joints for Circular Concrete Sewer and Culvert Pipe, Using Rubber Gaskets:

ASTM C 443. 5.6.2 External Sealing Bands for Noncircular Sewer, Storm Drain, and Culvert

Pipe: ASTM C 877. 5.6.3 Joints for Concrete Pipe, Manholes, and Manufactured Box Sections Using

Preformed Flexible Joint Sealants: ASTM C 990 5.6.4 Specification for Elastomeric Joint Sealants: ASTM C 920 5.6.5 Following items shall be submitted for approval to the engineer with

technical details and test reports, if required; a. PVC shims b. Lifting sockets c. Spacers for maintaining concrete cover d. Conduits for lighting and security purposes 5.6.6 PVC Pipes and fittings, if used for sewers, storm drains, culvers, shall be

approved by the COMPANY Representative prior to use. 5.7 Pipe Entry Connectors Pipe Entry Connectors shall satisfy ASTM C 923. 5.8 Grout 5.8.1 Sand Cement Mixtures Masonry grout shall conform to ASTM C 476 and shall have a minimum

compressive strength of 21 MPa at twenty-eight (28) days. This may contain mineral or chemical admixtures as approved by COMPANY representative, if required by SOW/TS. Site mix shall be as per ASTM C 109.

Aggregate : ASTM C 404, maximum coarse aggregate size

shall be 10 mm (3/8 in.) Lime : ASTM C 207, Type S Portland Cement : ASTM C 150, Type I and Type V Slump shall not be less than 200 mm.




5.8.2 Non-shrink Cementitious grout Non-shrink grout shall be premixed, packaged expansive and non-expansive

shrink- resistant as per ASTM 1107 with minimum Compressive strength not less than 38 Mpa (5500 psi) at 7 days. It shall be easy to use dry powder to be mixed with minimum quantity of water as per manufacturer recommendations, and shall be self levelling and fast setting.

5.8.3 Epoxy Grouts Epoxy grouts shall be as per ACI 503 with compressive strength not less than

38 MPa at 7 days. 5.9 Insulating materials Insulating materials should be able to provide the designed thermal properties for

sandwich wall panels. Approval of any insulating material to be used shall be obtained prior to use at site.

The density and other properties shall be tested by independent laboratory and

reports submitted for approval. The unit weight classification of insulating material is as follows: 5.9.1 Density of 240 Kg/m3 (15 lb per cu ft) or less Insulating materials may be fiberglass insulation or solid core rigid

polyurethane (foam-in-placed)/pre-foamed polystyrene insulation. The insulation material shall be such that the U-factor nor greater than 0.568 W/ (m-K)

Plastic materials such as polyurethane foam boards; polystyrene foam boards

or granules Glass materials including foamed glass boards or granules; glass fiber batts Paper materials such as paperboard honeycombs filled with insulating

granules or aggregate; cellulose granules. 5.9.2 Density of 256 Kg/m3 (16 lb per cu ft) to 800 Kg/m3 (50 lb per cu ft) Foamed concrete: autoclaved cellular concrete boards; non-autoclaved

cellular concrete boards of granules Mineral aggregate concrete: vermiculite concrete boards or granules; perlite

concrete boards or granules.




5.9.3 Precautions Due to high initial rates of water absorption and ability to absorb water from

the fresh concrete placed over and around them, Glass batts and granules should be enclosed in plastic bags to prevent absorption and rapid drying of the surrounding concrete. Open-cell board insulation should have a waterproof membrane coating applied before use.

6.0 CONSTRUCTION OF PRECAST UNITS Construction and fabrication methods employed shall be the latest in industry, and may

include battery casting, flat bed casting, or other techniques approved by SEC. The method of fabrication employed shall meet the requirements of ACI 533.

Manufacturer of precast units shall not commence the production until the COMPANY has

reviewed and accepted the samples submitted. 6.1 Formwork Material, construction and usage of formwork for manufacturing Precast concrete

products shall be as per ACI 347, and shall be of the type and design consistent with latest industry standards.

Forms may be constructed of rigid steel, fiberglass-reinforced plastic, concrete,

plastic, plaster, wood, plywood, fiberglass reinforced plywood, or equal approved material which will result in Precast concrete units having sharp arises, accurate dimensions, sureness of form, uniform shape and specified textures.

Forms shall be such that finished concrete will conform to the shapes, lines, grades,

and dimensions indicated on the drawing.The surface shall be free from honey-combining or blemishes. Forms shall be watertight

Forms shall be constructed so that the forces and vibrations to which the forms will

be subjected shall cause no product damage. In addition, following requirements shall be satisfied:

6.1.1 Forms shall be fitted with all necessary chamfers, block-outs, and inserts.

Forms shall be tight or sealed to prevent leakage of mortar or cement paste during manufacture.

6.1.2 Form material shall not warp or buckle because of temperature change or

moisture absorption, which would cause unsightly depressions and uneven swells in the finished surface. The form material shall be non-absorbent or sealed to prevent moisture absorption.

6.1.3 Forms shall be clean and the release agent thinly and evenly applied. Form

release agents shall not be allowed to build up on the form casting surfaces.




6.1.4 Finish of concrete products exposed to view shall be of the same quality and texture as that of COMPANY approved sample.

6.1.5 Forms shall be cleaned of concrete build-up after each use. 6.1.6 Form seams resulting from joining of form materials, shall be eliminated to

the extent that they will not reflect in the concrete or mar the appearance of the finished surface.

6.2 Reinforcement 6.2.1 Cages of reinforcement shall be fabricated either by tying the bars, wires or

welded wire fabric into rigid assemblies or by welding where permissible in accordance with AWS D1.4.

6.2.2 Reinforcement shall be positioned as specified by the design and as shown in

the approved drawings, so that the concrete cover conforms to requirements. 6.2.3 The concrete cover shall be as per TCS-Q-113.03. 6.3 Embedded Items Embedded items shall be positioned at locations specified in the approved design

drawings. Install required connecting devices, plates, angles, inserts, anchor bolts dowels, bolts

and accessories. Units shall be securely held in places of final installation and adjusted prior to permanent locking in place.

All embedded items shall be hot dip galvanized in accordance with ASTM A 123

and ASTM A 153. 6.4 Placing Concrete Concrete placement shall be as per TCS-Q-113.03. Concrete shall be placed and

consolidated to shape, configuration and dimension indicated. In addition, the following requirements shall be satisfied;

6.4.1 Concrete shall be deposited into forms evenly. 6.4.2 The free fall of the concrete shall be shall not be more than 1.5 meters. 6.4.3 Concrete shall be consolidated in such a manner that segregation of the

concrete is minimized and honeycombing kept to a minimum. 6.4.4 Vibrators used to consolidate concrete shall have frequencies and amplitudes

sufficient to produce well consolidated concrete.




6.4.5 In cases where applicable, Hot Weather concreting requirements shall be as per 70-TMSS-03, and ACI 305.

6.4.6 In cold weather the temperature of concrete at the time of placing shall not be

below 5C. Concrete that freezes before its compressive strength reaches 3.5 MPa (500 psi) shall be discarded.

6.4.7 Equipment made of aluminum alloys shall not be used for pump lines,

tremies, or chutes used to discharge concrete from truck mixer. 6.4.8 Concrete shall not be placed prior to a recorded pre-placement inspection and

authorization to proceed by SEC. 6.5 Curing Curing of all Precast units shall be done under near identical conditions to develop

concrete quality, and minimize appearance blemishes such as non-uniformity, staining, or surface cracking. Curing methods shall be submitted for approval to the COMPANY prior to any concrete casting.

6.5.1 Curing materials and methods shall be as per TCS-Q-113.03. 6.5.2 Curing with Heat and Moisture This method of curing shall be used only after approval by COMPANY

Representative. This method shall not be used if it is proved that the steam or heat treatment

is injurious to concrete due to presence of Pozzolanic admixtures. a. Concrete shall not be subjected to steam or hot air until after the

concrete has attained its initial set. Steam, if used, shall be applied within a suitable enclosure, which permits free circulation of the steam. If hot air is used for curing, precautions shall be taken to prevent moisture loss from the concrete.

b. The temperature of the concrete shall not be permitted to exceed 65C

(150 F). c. These requirements do not apply to products cured with steam under

pressure in an autoclave.




6.6 Stripping Products from Forms Products shall not be removed from the forms until the concrete reaches the required

compressive strength. 6.7 Finishes and Markings Surface finish shall be as per the schedule given in SOW/TS and/ or approved

Project drawings. In addition, following conditions shall be satisfied; 6.7.1 Surfaces intended to receive subsequent applications other than painting shall

be suitable for the purpose intended and shall be free of any coating that would interfere with adhesion or bond.

6.7.2 Plain surfaces that are to be painted or those required to be exposed to view

shall be smooth, free of form marks or texture 6.7.3 The finished surface and color shall match the approved sample and shall be

checked and approved by the COMPANY Representative. 6.7.4 Permanent markings in pre cast units to identify pick up points and

orientation in the structure, conforming with the markings indicated on shop drawings shall be provided. Date of casting on each precast units shall also be imprinted.

6.8 Tolerances Tolerances for Precast units shall be as per ACI 117 and ACI 533. 6.9 Samples 6.9.1 One full size precast concrete unit shall be constructed and erected in the

manufacturers plant representing the proposed finish, size, shape and anchorage. Sample may be used as part of WORK if it is in good condition and accepted by the COMPANY Representative.

6.9.2 One Precast wall sample measuring 500 mm x 500 mm x 50 mm shall be

provided and kept at site office for reference during inspection by the COMPANY Representative with finishes as required for front and back of the unit.

6.9.3 Accepted sample unit establishes minimum standard of quality and

workmanship expected for architectural precast concrete WORK. 6.9.4 When rear side of precast concrete unit is to be exposed, samples showing the

same shall be submitted for approval.




7.0 DELIVERY, STORAGE, AND HANDLING 7.1 Transportation of Precast Units Precast Units shall not be transported to the site until the concrete compressive

strength has reached 75% of the specified 28-day strength. Any unit with damage which impairs the performance of the product shall be

rejected. The product shall be transported with all safety precautions to the site. 7.1.1 Transportation Equipment The transportation shall be done in flat bed or any suitable trucks to the

location. The trucks shall be suitable and sufficeintly equipped to deliver Precast Concrete Units without causing irrepairable damage to them.

7.1.2 Access The access for trucks at Precast Plant, Precast storage area and the

construction site, shall be obstruction free. 7.2 Inspection 7.2.1 The inspection of the Precast units shall be done by the COMPANY

Representative before and after loading on the trucks at Precast storage area. Units shall be delivered to the erection site only after they have been completely cured and have been found to meet all applicable strength, appearance, dimensional and other design requirements.

7.2.2 Defective, damaged and/or marred units will not be accepted and shall not be

delivered to the site. Damaged units with chipped edges or spalled aggregates will not be accepted.

7.3 Handling and Storage 7.3.1 Precast concrete units shall at all times be handled in an acceptable manner.

All Precast concrete units shall be handled in a position consistent with their shape and design.

7.3.2 Wall panels shall be handled and delivered on edges to the maximum extent

possible. 7.3.3 Precast concrete units shall be transported in such a manner as to prevent

tipping or racking of the units and to prevent overstressing from jars and shocks.




7.3.4 The temporary braces, stiffeners, cradles and all necessary additional reinforcing shall be provided for handling operations without overstressing or damaging the units. The units shall be restrained from tipping over and tied to the satisfaction of COMPANY Representative.

7.3.5 Hoisting devices shall be located on non-exposed faces so that they can be

cut off and sealed weather tight after units are erected. 7.3.6 If storage of precast units at the site is necessary, units shall be stored in such

a manner that will prevent cracking, distortion, staining or other damage. Support members at their normal points

7.4 Erection 7.4.1 Manufacturer shall provide erection procedures in writing. In case of erection

being done by other agencies (not by manufacturer), approval shall be obtained from COMPANY Representative. Temporary bracing shall be maintained in place until final support is provided.

7.4.2 Necessary and sufficient hoisting equipment shall be provided so as to safely

and correctly hoist and erect the Precast units. 7.4.3 Units shall be erected without damage to shape or finish. Any damaged

panels shall be replaced. 7.4.4 Units shall be erected level, plumb, square and true within allowable

tolerances. Aligning and maintaining uniform horizontal and vertical joints to be done, as erection progresses.

7.4.5 Units shall be securely fastened in place. 7.4.6 Any additional reinforcement which is required to ensure that members are

not over-stressed when withdrawing from forms or during handling operations shall be designed adequately and provided. All the design calculations and shop drawings shall be submitted to the COMPANY. The modifications shall be highlighted in the shop drawings.

7.4.7 Approved Joint sealants shall be used for the erection of the Precast Units. 7.5 Concrete Repairs 7.5.1 Minor Repairs Minor Defects not impairing the functional use, appearance or expected life

of a precast concrete product shall be considered for minor repairs. Repair methods as described in TCS-Q-113.03 shall be used to repair the

minor defects.




7.5.2 Major Defects Defects in units that impair the functional use or the expected life of products

shall be considered major defects. COMPANY Representative shall determine if the defects can be repaired or

beyond repair. Units beyond repair shall be rejected. 8.0 QUALITY CONTROL AND SAFETY REQUIREMENTS Quality control for the production of precast concrete shall be per the PCI Manual 116. Quality control for the production of architectural precast concrete shall be as per the PCI

Manual 117. A Quality Control program which ensures compliance with this Specification shall be

submitted for SEC approval prior to the start of fabrication. 8.1 Materials All materials, including aggregates and water shall satisfy the physical and Chemical

requirements of 70-TMSS-03 and TCS-Q-113.03. 8.2 Ready Mixed Concrete Ready mixed Concrete shall satisfy the requirements of 70-TMSS-03. Concrete

mixed at site shall not be used for work. 8.3 Plant and Equipment The precast concrete shall be from SEC approved plants,which shall strictly adhere

to the NPCA Quality Control Manual and the relevent SASO SSA and ACI requirements.

8.4 Evaluation and Acceptance COMPANY Representative shall evaluate the Precast unit at delivery at site keeping

in view all the requirements given in this standard for approval. The installation of the unit shall be under the supervision of the COMPANY Representative.

The Precast concrete units will be considered deficient and subject to rejection by the

COMPANY Representative if the manufacturing process fails to comply with any of the requirements specified that may affect the appearance or strength of the Precast units.




8.5 Samples All finishes and colors shall match the Samples at site as per section 6.9 in

workmanship, color, and texture of the concrete. 8.6 Fire Rating and Safety 8.6.1 Fire rating Precast units which are shown or scheduled in the plan shall be fire resistant,

rated according to the Company requirement 8.6.2 Safety All safety measures as per the COMPANY safety requirements shall be

exercised. No employee/persons other than fabricators employees shall be permitted under precast concrete members being lifted or fitted into position except those employees required for the erection engaged by the Fabricator.




9.0 SUBMITTALS Prior to precast concrete fabrication, structural design calculations, design drawings and

shop drawings including lifting details shall be submitted to the COMPANY for review and approval.

In addition, following shall also be submitted to the COMPANY for approval. 9.1 Material Test Reports All tests and frequencies of testing for aggregates, water, and concrete shall be as per

70-TMSS-03. The reports shall be from an independant testing agency approved by the COMPANY. The COMPANY Representative may witness the tests and shall have unobstructed access to the laboratory.

9.2 Design Mixes Design Mix details and 28 day strength test reports shall be submitted for each

precast concrete mixture, including compressive strength and water-absorption tests. 9.3 Erection Drawings Submit complete fabrication and installation details/drawings of structural precast

concrete units. Member locations, placement plans, elevations, dimensions, shapes, cross sections, openings, extent and location of each finish, connections, support conditions and types of reinforcement, joints and locations of splices including special reinforcement shall be indicated clearly in the drawings.

9.4 Handling Procedures Handling procedures, sequence of erection, and bracing plan shall be submitted in

detail.

Tcsq11304r0 Precast Concrete

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