SPECIAL SPECIFICATION 2043 Brick Veneer on MSE Wall

Transcription

1 2004 Specifications CSJ SPECIAL SPECIFICATION 2043 Brick Veneer on MSE Wall 1. Description. This Item shall govern for the furnishing of the materials and construction of brick veneers on abutment architectural precast MSE walls, coating same with permanent anti-graffiti coating, as shown on the plans and required by this Item. 2. General. A. All architectural precast, brick veneer and mold materials furnished by the contractor shall be new and shall conform to the applicable requirements of ACI, APA, and PCI. B. Provide new materials which comply with the details shown on the drawings, the requirements of this item, and the pertinent requirements of the following items: 1. Item 423, Retaining Walls 2. Item 424, Precast Concrete Structures (Fabrication) 3. Item 740, Graffiti Removal and Anti-Graffiti Coating 4. DMS-8111, Anti-Graffiti Coatings C. Furnish 2 sample sets of the brick veneer, veneer mold system and anti-graffiti coating material information to the Engineer at the project address. Do not begin work before these submittals are approved by the Engineer. 3. Quality Assurance. A. Installer Qualifications: A firm that specializes in performing Work of this section with a minimum of five years of documented experience. B. Fabricator Qualifications: A firm that specializes in performing Work of this section with a minimum of five years of documented experience. C. Testing Agency Qualifications: An independent testing agency qualified according to ASTM C 1077 and ASTM E 329 for testing indicated. D. Design Standards: Comply with ACI 318 and design recommendations of PCI MNL 120, "PCI Design Handbook - Precast and Prestressed Concrete," applicable to types of architectural precast concrete units indicated. E. Quality-Control Standard: For manufacturing procedures and testing requirements, quality-control recommendations, and dimensional tolerances for types of units required, comply with PCI MNL 117, "Manual for Quality Control for Plants and Production of Architectural Precast Concrete Products."

2 F. Sample Panels: After sample approval and before fabricating architectural precast concrete units with brick veneer, produce a minimum of 2 sample panels approximately 16 sq. ft. in area for review by Engineer. Incorporate full-scale details of architectural features, finishes, opaque sealer, textures, and transitions in sample panels. 1. Locate panels where indicated or, if not indicated, as directed by Engineer. 2. Apply anti-graffiti coating to one sample. Conduct surface preparation application test on constructed and painted mockup as recommended by manufacturer, for Engineer to review and approve for coating compatibility with brick, mortar and opaque sealer surfaces. 3. Damage part of an exposed-face surface for each finish, color, and texture, and demonstrate adequacy of repair techniques proposed for repair of surface blemishes. Remove damaged bricks and replace them until repair and replacement technique and appearance is accepted by Engineer as the standard for repair and replacement quality and workmanship. Do the same for the painted, textured precast concrete. Repair and repaint to determine acceptable technique. 4. After acceptance of repair technique, maintain one sample panel at manufacturer's plant and one at Project site in an undisturbed condition as a standard for judging the completed Work. 5. Demolish and remove sample panels when directed. H. Mockups: After sample panel approval but before production of architectural precast concrete units with brick veneer, construct full-sized mockup panels to verify selections made under sample submittals and to demonstrate aesthetic effects and set quality standards for materials and execution. 1. Build two (2) 4 panel mockups of two full abutment brick veneer precast wall panels either flat on ground if not to be used as part of the work, one mockup near wall B and one mock up near wall E, or stacked and fully anchored vertically in place, one mockup on wall B and one mock up on wall E, built to a 4 panel, 20 foot minimum height above footing, to show brick veneer panel construction, joint between panels, textured and painted precast concrete banding and insets. 2. Approved mockup built vertically in place may become part of the completed Work if undamaged at time of Substantial Completion. 3. Approval of mockup does not constitute approval of deviations from the Contract Documents unless such deviations are specifically approved by Engineer in writing. 4. Delivery, Storage and Handling. A. Deliver architectural precast concrete units with brick veneer in such quantities and at such times to limit unloading units temporarily on the ground or storing them on site. B. Support units during shipment on non-staining shock-absorbing material

3 C. Store units with adequate dunnage and bracing and protect units to prevent contact with soil, to prevent staining, and to prevent chips, scratches, cracking, distortion, warping or other physical damage. D. Place stored units so identification marks are clearly visible, and units can be inspected. E. Handle and transport units in a position consistent with their shape and design in order to avoid excessive stresses which would cause cracking or damage. F. Lift and support units only at designated points shown on Shop Drawings. 5. Preparation. A. Furnish loose connection hardware and anchorage items to be embedded in or attached to other construction without delaying the Work. Provide locations, setting diagrams, templates, instructions, and directions, as required, for installation. 6. Materials. A. General. This specification is for provision of Brick-faced architectural precast concrete MSE wall units. Use clay brick veneer that matches the brick color and size of the Lewisville City Hall with its materials and manufacturing from a single source as shown on the plans and as approved by the Engineer. B. Thin Brick. ASTM C 1088, Grade SW, Type TBX. 1. Unit Compressive Strength: Provide units with minimum average net-area compressive strength of 8400 psi. 2. Cold Water Absorption at 24 hours: Maximum 6% when tested per ASTM C Efflorescence: Provide brick that has been tested according to ASTM C 67 and is rated "not effloresced." 4. Stretcher Size (Actual Dimensions): Approximately 1/2 inches thick by 3-5/8 inches high by 11-5/8 inches long. 5. Corner Brick Size (If needed, Actual Dimensions): Approximately 1/2 inches thick by 3-5/8 inches wide by 3-5/8 inches high by 11-5/8 inches long. 6. Brick Color: Brick color is to match the brick color of the Lewisville City Hall as field approved by the Engineer from samples to be submitted by the Contractor. Brick is to be colored all the way through the brick. 7. Available Manufacturers, subject to the requirements of this specification: a. American Brick Co. b. Endicott Clay Products Co. c. Glen-Gery Brick Co. d. Marion Ceramics e. Metro Brick. f. Summitville Tile. 8. Provide custom cast brick gasket liner as manufactured by one of the following:

4 a. Architectural Casting Products, LLC. b. Architectural Polymers, Versabrix. c. Fitzgerald, BrickMaster. Multi-use Thin Brick System. d. Scott System, Brick Gasket Liner. e. Universal Brick Systems; FITZIT-M. C. Thin Brick Facings. A. Place form liner templates accurately to provide grid for thin brick facings. Provide solid backing and supports to maintain stability of liners while placing thin bricks and during concrete placement. B. Securely place thin brick units face down into form liner pockets and place concrete backing mixture. C. Clean faces and joints of brick facing. D. Maintain 3/8 joint at joints between panels; provide returns if necessary to maintain desired aesthetic effect. D. Molds. Cast brick gasket liner, rigid, dimensionally stable, non-absorptive material, warp and buckle free, that will provide continuous and true precast concrete surfaces within fabrication tolerances indicated; nonreactive with concrete and suitable for producing required finishes. 1. Mold-Release Agent: Commercially produced liquid-release agent that will not bond with, stain or adversely affect precast concrete surfaces and will not impair subsequent surface or joint treatments of precast concrete. E. Mold Fabrication. 1. Molds: Accurately construct molds, mortar tight, of sufficient strength to withstand pressures due to concrete-placement operations and temperature changes. Coat contact surfaces of molds with release agent before reinforcement is placed. Avoid contamination of reinforcement by release agent. 2. Place form liners accurately to provide finished surface texture indicated. Provide solid backing and supports to maintain stability of liners during concrete placement. Coat form liner with form-release agent. 3. Maintain molds to provide completed architectural precast concrete units of shapes, lines, and dimensions indicated, within fabrication tolerances specified. 4. Form joints are not permitted on faces exposed to view in the finished work. 5. Edge and Corner Treatment: Uniformly radiused

5 F. Grout Materials. 1. Sand-Cement Grout: Portland cement, ASTM C 150, Type I, and clean, natural sand, ASTM C 144, or ASTM C 404. Mix at ratio of 1 part cement to 2-1/2 parts sand, by volume, with minimum water required for placement and hydration. 2. Nonmetallic, Nonshrink Grout: Premixed, nonmetallic, noncorrosive, nonstaining grout containing selected silica sands, portland cement, shrinkage-compensating agents, plasticizing and water-reducing agents, complying with ASTM C 1107, Grade A for drypack and Grades B and C for flowable grout and of consistency suitable for application within a 30-minute working time. G. Masonry Cements. Conform to DMS-4600, Hydraulic Cement, Type 1 only, white cement only, unless otherwise noted on the plans. H. Sand. Use material complying with ASTM C144. Use natural sand or quartz sand only for mortar. I. Water. Use only potable water. J. Hydrated Lime. The material shall conform to DMS 6350, Lime and Lime Slurry. K. Mortar for Brick Veneer. Comply with ASTM C270, Proportion Specification. Compressive strength shall be 1800-psi minimum in 28 days with a maximum air content of 12%. L. Setting Mortar. Use setting mortar in accordance with ASTM C270, Type S. M. Pointing Mortar. Use pointing mortar in accordance with ASTM C270, Type N. N. Anti-Graffiti Coating. Permanent waterborne urethane-silicone polymers coating in single component or two-component form, optically clear transparent satin finish, UV resistant, resistant to abrasion, stains, mold and mildew, low VOC, non-sacrificial. Coating product shall be compatible with brick, mortar and colored opaque sealer. Apply per manufacturer recommendations. 7. Construction Methods. Set the brick veneer in strict accordance with approved profile and jointing pattern. Joints shall be 3/8 in. wide. Refer to the plans for specific brick veneer installation details. Brick veneer is to be shop applied to architectural precast wall panels by qualified manufacturer. Complete panels are to be protected and brought to the project site for installation. Items below describe fabrication and appearance tolerances. A. Lay the brick veneer in full bed of mortar with head and edge joints completely filled. B. Do not lay brick if temperature is below 40 F. C. Clean the brick veneer before setting by thoroughly scrubbing with fiber brushes followed by a thorough rinsing with clean water. Use only mild cleaning compounds that contain no caustic or harsh fillers or abrasives. D. Keep brick veneer cleaned of excess mortar during construction

6 E. Set brick veneer in accordance with the plans, final shop drawings and accepted mockups. Brick-Faced Architectural Precast Concrete Units: Restrict the following misalignments to 1 percent of number of bricks in a unit. 1. Alignment of Mortar Joints: a. Jog in Alignment: 1/8 inch. b. Alignment with Panel Centerline: Plus or minus 1/8 inch. 2. Variation in Width of Exposed Mortar Joints: Plus or minus 1/8 inch. 3. Tipping of Individual Bricks from the Panel Plane of Exposed Brick Surface: Plus 1/16 inch; minus 1/8 inch. 4. Exposed Brick Surface Parallel to Primary Control Surface of Panel: Plus 1/8 inch; minus 1/8 inch. 5. Individual Brick Step in Face from Panel Plane of Exposed Brick Surface: Plus 1/16 inch; minus 1/8 inch. 8. Adjustment and Cleaning. Perform adjustment of brick veneer as required until acceptance by the Engineer. A. Replace brick that becomes broken, chipped, stained or otherwise damaged. Replace unsatisfactory joints as required to provide a neat, uniform appearance. B. Clean brick veneer promptly after installation with fiber brushes and clean water, or a mild cleaning agent. Do not use wire brushes, acidic cleaning agents, or cleaners that contain caustic or harsh fillers or abrasives. C. Maintain site conditions to ensure that brick veneer will not be damaged, discolored or sustain deterioration during subsequent construction. 9. Measurement. Brick Veneer will be measured by the square foot of exposed surface area. Only accepted work will be included, and the dimensions used for measurement will be those shown on the plans or as stated in writing by the Engineer. 10. Payment. The work performed and materials furnished in accordance with this Item and measured as provided under Measurement shall be paid for at the unit price bid for Brick Veneer of the thickness specified. Brick Veneer molded anchoring system and grouting shall be considered subsidiary to this bid item. This price shall be full compensation for furnishing the brick, placing, grouting, finishing and cleaning of the Brick Veneer, and for all materials, tools, labor, equipment and incidentals necessary to complete the work. The preparation of samples or mock-ups described will not be paid for directly and shall be considered subsidiary to this bid item