062013_GRFC.pdf

518-18-035 Outpatient Mental Health Renovation

VAMC Bedford

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SECTION 06 20 13

EXTERIOR FINISH CARPENTRY

(Factory-molded GFRC fabrications)

PART 1 - GENERAL

1.1 SUMMARY

A. This section includes furnishing all materials, lab or, equipment, and related services necessary to supply and instal l molded glass fiber reinforced concrete (GFRC) fabrications as in dicated in the contract documents, and in compliance with applicab le codes.

1.2 RELATED SECTIONS

A. Section 06 10 00 Rough Carpentry – for connection a ttachment to structural steel framing.

B. Section 05 12 00 Structural Steel – for connection attachment to structural steel framing.

C. Section 07 92 00 Joint Protection – for joint seala nts and expansion control

1.3 REFERENCES

A. ASTM International (ASTM)

1. C947 Standard Test Method for Flexural Properti es of Thin

Section Glass Fiber Reinforced Concrete.

2. E84 Standard Test Method for Surface Burning C haracteristics of Building materials.

1.4 ACTION SUBMITTALS

A. Product Data: Submit product data sheets for each s pecified product.

B. Shop Drawings: Submit drawings for approval showing plans, sections, details, joint treatment, reinforcing, fa stening devices and the relation of the GFRC parts to the surroundi ng construction.

C. Samples: Submit a minimum of 3 flat samples of GFRC material for each color and texture indicated.

1.5 QUALITY ASSURANCE

A. Manufacturer Qualifications:

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a. Manufacturer shall have a minimum of 10 years’ expe rience having successfully supplied GRFC parts for other p rojects similar in scope and complexity for the work of thi s Contract.

b. Manufacturer shall have a minimum of 10 years’ expe rience using 3D modelling software and CNC machines for the crea tion of master patterns used to make molds for fabricated G FRC components.

B. Installer Qualifications: Installer shall have a m inimum of 5 years’ experience having successfully completed pro jects similar in scope and complexity for the work of this Contra ct.

C. All GFRC parts to be provided by the same manufactu rer using the same source of materials for the project.

D. Substrates to accept GFRC parts shall be installed straight and true within 1/8 in. in 8 linear ft. (3mm in 2500mm) and shall be free of obstructions and interference that prohibit s the correct alignment and attachment of the GFRC parts.

E. Where the work schedule permits, confirm dimensions and site conditions prior to manufacturing materials specifi ed in this section. Any deviations from the design conditions or dimensions to be provided to the manufacturer for inclusion in the shop drawings.

1.6 DELIVERY, STORAGE AND HANDLING

A. Handle and transport GFRC parts to avoid damage. Pl ace non-staining resilient spacers between parts and suppor t parts during shipment.

B. Parts shall be kept clean and dry and stored to pre vent distortion, warping, and other physical damage in a ccordance with the manufacturer’s recommendations.

C. Place stored panels so part identification labels a re clearly visible.

1.7 WARRANTY

A. Manufacturer Warranty: Provide manufacturer’s stan dard product warranty.

PART 2 – PRODUCTS

2.1 GLASS FIBER REINFORCED CONCRETE (GFRC) PARTS

A. Fabrications: Molded GFRC parts are to be made with out a steel panel frame backing in accordance with the approved samples, contract documents and shop drawings.

B. Part Thickness: GFRC parts to have a nominal shell thickness of

5/8” (16mm) with the perimeter edges a minimum of 1 ” (25mm) nominal thickness as detailed on the shop drawings.

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C. All GFRC parts to have labels affixed to the back i ndividually indentifying them with the same part numbers used o n the shop

D. Materials:

i.For all GFRC parts with integral color, use white Portland cement from the same source throughout the project.

ii.Alkali resistant glass fiber with a minimum Zirc onium content of 16%.

iii.Silica sand washed and dried, complying with co mposition requirements of ASTM C144.

iv.Aggregate selected for hardness and durability, free of material that reacts with cement or causes staini ng.

v.Polymer curing admixture to impart specific prope rties to the

GFRC.

vi.Color pigments and/or admixtures to provide inte gral color throughout the material thickness to match the sele cted sample.

E. Face Mix: Proportion the Portland cement, silica sa nd, aggregates and admixtures to comply with the face mix design r equirements.

F. Backing Mix: Proportion the Portland cement, glass fibers, silica sand, aggregates and admixtures to comply with the backing mix design requirements. Glass fiber content to be a mi nimum of 4% by weight of the total mix.

G. Connection Hardware: Structural brackets or shapes used to support or attach GFRC panels to the structure to b e fabricated from corrosion resistant metal of appropriate type and gauge for the application.

2.2 PHYSICAL PROPERTIES

A. Matrix: Portland cement, sand, and polymer Shell thickness: 5/8” (16 mm) nominal Edge thickness: 5/8” (16 mm) minimum Density: ~134 lb/ft³ (2145 kg/m³) Weight: 6½ - 7½ lb/ft² (32-37 kg/m²) Glass fiber: 4% minimum Color: As specified Surface: Lightly sandblasted or smooth if paint rea dy Flexural Strength: 1,860 psi (12.8 MPa) Tensile Strength: 1260 psi (8.7 MPa) Compressive Strength: 4,000 psi (27.6 MPa) Coefficient of Linear Thermal Expansion (ASTM D696) : 7.6 x 10 -6 in/in/ºF (13.6 x 10 -6 mm/mm/ºC)

Hardness (Abrasion): 0.37% Thermal Conductivity: 4.3 Btu in/h/ft²/ºF (0.62 W/ m²) Surface Burning Characteristics (ASTM E84):

Flame Spread: 0 Smoke Development: 0

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PART 3 – EXECUTION

3.1 EXAMINATION

A. Site Conditions: Verify the conditions for complia nce with the requirements including environmental conditions, in stallation tolerances and other conditions affecting the insta llation and performance of GFRC parts. Any unsatisfactory condi tions to be corrected prior to installation.

B. Field Dimensions: Field dimensions are to be verifi ed including those not shown on the drawings. Any discrepancies are to be brought to the attention of the Architect with reso lutions to the discrepancies to be mutually agreed upon by all par ties involved.

Details of any changes required must be incorporate d into the manufacturer’s shop drawings prior to commencing th e manufacture of the GFRC parts.

3.2 PREPARATION

A. Substrate: Substrates to accept GFRC parts, provide d by others, shall be installed straight and true within 1/8 in. in 8 ft. (3mm in 2500mm) and shall be free of obstructions and in terference that prohibits correct attachment of GFRC parts.

B. Structural framing members, provided by others, sha ll be of the proper size and design for the intended use and sha ll be sufficient to properly support the installed GFRC p arts.

3.3 INSTALLATION

A. Install in accordance with the manufacturer’s instr uctions, contract documents and shop drawings.

B. It is the Installer’s responsibility to verify scop e and to order the correct quantities of parts (including a waste allowance).

C. Supply and install all clips, hangers and other acc essories required for work in this section and to ensure a s olid and secure installation of the GFRC parts.

D. Provide temporary supports or bracing as required t o maintain position, stability and alignment in accordance to the shop

E. Provide joint spacing between parts as detailed for expansion and the application of joint treatment materials.

F. Complete joint treatment, patching and cleaning in accordance to the manufacturer’s recommendations. Plan in advance to secure Architect approval of any use of color matching cau lk (to be supplied by installer).

3.4 CLEANING AND PROTECTION

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A. Perform cleaning procedures, if necessary, accor ding to GFRC manufacturer’s written instructions. Take precautio ns to prevent damage to GFRC surfaces and staining of adjacent ma terials.

END OF SECTION