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HomeMy WebLinkAbout04 22 00 - Concrete Unit MasonryCORNELL UNIVERSITY DIVISION 4 - MASONRY Ithaca, New York SECTION 04 22 00 - CONCRETE UNIT MASONRY CLARA DICKSON HALL CONCRETE UNIT MASONRY 04 22 00-1 WASTE & STORM LINE REPLACEMENT DECEMBER 31, 2014 SECTION 042200–CONCRETE UNIT MASONRY PART 1 - GENERAL 1.1 RELATED DOCUMENTS A. Division 01 Specification Sections, Drawings, General Conditions, Supplementary General Conditions, and Special Conditions apply to this section. 1.2 REFERENCES A. TMS 602/ACI 530.1/ASCE 6 2011Specification for Masonry Structures B. ASTM International (latest versions) 1. ASTM A951 Standard Specification for Masonry Joint Reinforcement 2. ASTM C90 Standard Specification for Loadbearing Concrete Masonry Units 3. ASTM C140 Standard Test Method for Sampling and Testing Concrete Masonry Units 4. ASTM C150 Standard Specification for Portland Cement 5. ASTM C270 Standard Specification for Mortar for Unit Masonry 6. ASTM C476 Standard Specification for Grout for Unit Masonry 7. ASTM C1019 Standard Test Method for Sampling and Testing Grout 8. ASTM C1314 Standard Test Method for Compressive Strength of Masonry Prisms 9. ASTM C1586 Standard Guide for Quality Assurance of Mortars 10. ASTM C1714/C1714M Standard Specification for Preblended Dry Mortar Mix for Unit Masonry 1.3 SUMMARY A. Section Includes: 1. Concrete masonry units (CMUs). 2. Mortar and grout. 3. Reinforcing steel. 4. Control joint materials. 5. Masonry joint reinforcement. 6. Ties and anchors. 7. Embedded flashing. 8. Miscellaneous masonry accessories. B. Related Sections: 1. Section 079200 Joint Sealants for sealing control and expansion joints in unit masonry. CORNELL UNIVERSITY DIVISION 4 - MASONRY Ithaca, New York SECTION 04 22 00 - CONCRETE UNIT MASONRY CLARA DICKSON HALL CONCRETE UNIT MASONRY 04 22 00-2 WASTE & STORM LINE REPLACEMENT DECEMBER 31, 2014 1.4 SYSTEM DESCRIPTION A. Provide materials to achieve the net compressive strength of concrete unit masonry equal to or greater than 1500 psi f'm. 1.5 SUBMITTALS A. Obtain written acceptance of submittals prior to use of the following: 1. Submit mix designs and test reports a. Preblended mortar 1) Mix design indicating types and proportions of materialsaccording to proportion specification of ASTM C270, or 2) Mix designs and mortar tests performed in accordance with the property specification of ASTM C270 b. Conventional grout 1) Mix design indicating types and proportions of materials according to proportion requirements of ASTM C476, or 2) Mix design and grout strength test performed in accordance with ASTM C476. 2. Submit material certificates for each of the following certifying compliance. a. Concrete masonry units. b. Steel reinforcing bars. c. Anchors, ties, fasteners, and metal accessories. d. Preformed control joint gaskets. B. Samples for Verification: For each type and color of the following: 1. Exposed concrete masonry units. 1.6 QUALITY ASSURANCE A. Preinstallation Conference: Conduct conference at Project site to comply with requirements in Division 01 Section "Project Management and Coordination". 1.7 DELIVERY, STORAGE, AND HANDLING A. All materials of this section shall be protected to maintain quality and physical requirements. B. All masonry units shall be stored on the jobsite so that they are protected from rain, stored off- ground and kept free of contamination. C. Store preblended mortar mix in manufacturer’s original, unopened, undamaged containers with identification labels intact, covered and protected from weather, or in a dispensing silo. CORNELL UNIVERSITY DIVISION 4 - MASONRY Ithaca, New York SECTION 04 22 00 - CONCRETE UNIT MASONRY CLARA DICKSON HALL CONCRETE UNIT MASONRY 04 22 00-3 WASTE & STORM LINE REPLACEMENT DECEMBER 31, 2014 PART 2 - PRODUCTS 2.1 CONCRETE MASONRY UNITS A. Concrete Masonry Units: ASTM C90. 1. Weight Classification: Mediumweight unless otherwise indicated. 2. Size: FIELD VERIFY - Match to existing adjacent partition sizes. 3. Texture(s): FIELD VERIFY - For exposed block, match to existing adjacent partition texture type. 2.2 MORTAR AND GROUT MATERIALS A. Masonry Mortar preblended factory mix:ASTM C270and ASTM C1714 B. Grout for masonry:ASTM C476 C. Admixtures: 1. The use of admixtures shall not be permitted except as specified herein, or as approved by the Design Professional and the Building Official. 2.3 REINFORCEMENT AND METAL ACCESSORIES A. Metal reinforcement and accessories shall conform to TMS 602/ACI 530.1/ASCE 6 Article 2.4 B. Steel Reinforcing Bars: ASTM A615. C. Masonry Joint Reinforcement: ASTM A951. Maximum spacing of cross wires in ladder-type and points of connection of cross wires of truss-type joint reinforcement shall be 16 in. D. Anchors, ties, and accessories: 1. Plate and bent-bar anchors: ASTM A36/A36M. 2. Sheet-metal anchors and ties: ASTM A1008/A1008M. 3. Wire mesh ties: ASTM A185/A185M. 4. Wire ties and anchors: ASTM A82/A82M. 5. Headed anchor bolts: ASTM A307, Grade A. E. Coatings for corrosion protection. Unless otherwise required, protect carbon steel joint reinforcement, ties, and anchors from corrosion by galvanizing or epoxy coating in conformance with the following minimums: 1. Mill galvanized coatings: a. Joint reinforcement: ASTM A641 (0.1 oz/ft2) b. Sheet metal anchors and ties: ASTM A653 Coating Designation G60 2. Hot-dipped galvanized coatings: a. Joint reinforcement, wire ties, and wire anchors: ASTM A153 (1.50 oz/ft2) b. Sheet metal anchors and ties: ASTM A153 Class B 3. Epoxy coatings: CORNELL UNIVERSITY DIVISION 4 - MASONRY Ithaca, New York SECTION 04 22 00 - CONCRETE UNIT MASONRY CLARA DICKSON HALL CONCRETE UNIT MASONRY 04 22 00-4 WASTE & STORM LINE REPLACEMENT DECEMBER 31, 2014 a. Joint reinforcement: ASTM A884 Class A Type 1 — ≥7 mils b. Wire ties and anchors: ASTM A899 Class C — 20 mils c. Sheet metal anchors and ties: 20 mils per manufacturer's specification 2.4 MISCELLANEOUS MASONRY ACCESSORIES A. Rubber Preformed Control-Joint Gaskets: per ASTM D2000, Designation M2AA-805. B. PVC Preformed Control-Joint Gaskets: per ASTM D2287, Type PVC 654-4. 2.5 MASONRY CLEANER A. Use potable water and detergents to clean masonry unless otherwise approved. B. Do not use acid or caustic solutions unless otherwise approved. 2.6 MIXING A. Mortar: 1. Mix masonry mortar preblended factory mix per manufacturer's recommendations. B. Conventional grout: 1. Mix grout to a consistency that has a slump between 8 and 11 in. C. Self-consolidating grout: 1. Job-site proportioning of self-consolidating grout is not permitted. 2. Do not add water at the job site except in accordance with the manufacturer's recommendations. 2.7 Fabrication A. Fabricate reinforcement per TMS 602/ACI 530.1/ASCE 6 Article 2.7 A. PART 3 - EXECUTION 3.1 EXAMINATION A. Prior to the start of masonry installation, verify all conditions pertinent to the performance of work in this Section are acceptable. 1. Verify foundations are constructed within a level alignment tolerance of ± 1/2 in. 2. Verify that reinforcing dowels are properly positioned. B. Masonry work shall not proceed until unsatisfactory conditions have been corrected or approved by the Design Professional. CORNELL UNIVERSITY DIVISION 4 - MASONRY Ithaca, New York SECTION 04 22 00 - CONCRETE UNIT MASONRY CLARA DICKSON HALL CONCRETE UNIT MASONRY 04 22 00-5 WASTE & STORM LINE REPLACEMENT DECEMBER 31, 2014 3.2 PREPARATION A. Clean reinforcement and shanks of anchor bolts by removing mud, oil, or other materials that will adversely affect bond to mortar or grout. 1. Reinforcement with rust and/or mill scale is acceptable provided attributes of a cleaned sample are in accordance with the applicable ASTM specification. B. Prior to laying masonry, remove laitance, loose aggregate, and any other material that would prevent mortar from bonding to the foundation. C. Do not wet units before laying, unless otherwise required. Wet cutting is permitted. D. Cut units as required to fit; use motor-driven masonry saw. Install cut units with cut surfaces concealed as much as possible. 3.3 INSTALLATION A. Select and arrange units for exposed masonry to produce a uniform blend of colors and textures. 1. Mix units from several pallets or cubes as they are placed. B. Comply with construction tolerances in TMS 602/ACI 530.1/ASCE 6, Article 3.3F. C. Construct grout spaces free of mortar dropping, debris, and any material deleterious to grouting. D. Construct cleanouts in the bottom course of masonry for each grout pour when the grout pour height exceeds 5 ft 4in. 1. Hollow-unit masonry: create cleanout by cutting off entire face shell of the cmu. Replace face shell after inspection and before grouting. 2. Solid-unit multiwythe masonry: create cleanout by leaving out every other unit. Install unit after inspection and before grouting. 3. Brace cleanout closure to resist grout pressure. 4. For partially grouted masonry, construct cleanouts at bottom of each cell to be grouted. 5. For solid grouted masonry, space cleanouts horizontally a maximum 32 in. on center. E. All masonry shall be laid true, level, plumb, and in accordance with the drawings. F. Ensure all vertical cells to be grouted are aligned and unobstructed openings for grout are provided. G. Exposed masonry shall be laid in running bondunless otherwise indicated in Project Drawings. H. Concealed masonry with shall be laid in running bond unless otherwise indicated. I. Brace masonry during construction to assure stability. Design, provide, and install bracing. 3.4 MORTAR BEDDING AND JOINTING A. Place mortar in accordance with TMS 602/ACI 530.1/ASCE 6 Article 3.3 B CORNELL UNIVERSITY DIVISION 4 - MASONRY Ithaca, New York SECTION 04 22 00 - CONCRETE UNIT MASONRY CLARA DICKSON HALL CONCRETE UNIT MASONRY 04 22 00-6 WASTE & STORM LINE REPLACEMENT DECEMBER 31, 2014 B. Initial bed joint shall not be less than 1/4 inch nor more than 3/4 inch. C. All head and bed joints, except as in 3.4 B., shall be a nominal 3/8 in. thick, unless otherwise required. D. Thickness of bed joints shall not exceed 5/8 inch. E. Lay hollow units with head and bed joints filled with mortar for the thickness of the face shell. F. Lay solid units with full head and bed joints. Do not fill head joints by slushing with mortar. Bed joints shall not be furrowed deep enough to produce voids. G. Remove mortar protrusions extending 1/2 in. or more into cells to be grouted. H. Fully mortar webs in all courses of piers, columns and pilasters, in the starting course on foundations, and when necessary to confine grout. I. All mortar joints on exposed walls shall be concave, unless otherwise indicated, and struck to produce a dense, slightly concave surface well bonded to the surface of the masonry unit. J. Remove and re-lay in fresh mortar any unit that has been disturbed to the extent the initial bond is broken. 3.5 EMBEDDED ITEMS AND ACCESSORIES A. Construct control joints as masonry progresses. 1. Install preformed control-joint gaskets designed to fit standard sash block. B. Construct chases as masonry units are laid. C. Installpipes and conduits passing horizontally through nonbearing masonry partitions as indicated. D. Place pipes and conduits passing horizontally through piers, pilasters, or columns as indicated. E. Place horizontal pipes and conduits in and parallel to plane of walls. F. Install and secure connectors, flashing, weep holes, weep vents, nailing blocks, and other accessories as required. 3.6 INSTALLATION OF REINFORCING STEEL, WALL TIES, AND ANCHORS A. Install reinforcing steel, wall ties, and anchors in accordance with TMS 602/ACI 530.1/ASCE 6 Article 3.4 B. Place reinforcement as detailed on the drawings. 1. Support and fasten reinforcement to prevent displacement beyond specified tolerances during construction and grouting operations. CORNELL UNIVERSITY DIVISION 4 - MASONRY Ithaca, New York SECTION 04 22 00 - CONCRETE UNIT MASONRY CLARA DICKSON HALL CONCRETE UNIT MASONRY 04 22 00-7 WASTE & STORM LINE REPLACEMENT DECEMBER 31, 2014 2. Maintain clear distances between reinforcement and any interior face of masonry unit or formed surface, but not less than 1/4 in. for fine grout, or 1/2 in. for coarse grout. 3. Completely embed reinforcing bars in grout. 4. Place reinforcing bars maintaining minimum cover of: a. Where masonry is not exposed to weather, 11/2 in. 5. Embed joint reinforcement with minimum 5/8 inch cover to faces exposed to weather or earth, and 1/2inch elsewhere. a. Provide minimum 6-in. lap splices and ensure that all ends of longitudinal wires are embedded in mortar at laps. 6. Tolerances for placement of reinforcing bars in walls and flexural elements shall be ± 1/2 in. when the distance from the centerline of reinforcing bars to the opposite face of masonry, d, is equal to 8 in. or less, ± 1 in. for d equal to 24 in. or less but greater than 8 in., and ± 11/4 in. for d greater than 24 in. 7. Foundation dowels that interfere with unit webs are permitted to be bent to a maximum of 1 in. horizontally for every 6 in. of vertical height. C. Install wall ties as detailed on the drawings and in accordance with TMS 602/ACI 530.1/ASCE 6 Article 3.4 C. D. Install anchor boltsties as detailed on the drawings and in accordance with TMS 602/ACI 530.1/ASCE 6 Article 3.4 D. 1. Embed headed and bent-bar anchor bolts in grout. Anchor bolts of 1/4 in. or less may be placed in mortar bed joints at least 1/2 in. in specified thickness. 2. Maintain clear distance between anchor bolts and any face of masonry unit or formed surface of at least 1/4 in. when using fine grout, and of at least 1/2 in. when using coarse grout. 3. Maintain a clear distance between parallel anchor bolts not less the diameter of the anchor bolt, nor less than 1 in. 3.7 GROUTING A. Comply with grout placement requirements in TMS 602/ACI 530.1/ASCE 6 Article 3.5 B. Place grout within 11/2 hr from introducing water in the mixture and prior to initial set. 1. Discard field-mixed grout that does not meet specified slump without adding water after initial mixing. C. Grout pour height: do not exceed maximum grout pour height as given in TMS 602/ACI 530.1/ASCE 6 Table 7, or as otherwise specified. D. Grout space for multiwythe masonry: build vertical grout barriers of solid masonry across the grout space the entire height of the grout pour to control the flow of grout horizontally. Grout barriers shall not exceed 30 ft. apart. E. Grout lift height: 1. Conventional grout: CORNELL UNIVERSITY DIVISION 4 - MASONRY Ithaca, New York SECTION 04 22 00 - CONCRETE UNIT MASONRY CLARA DICKSON HALL CONCRETE UNIT MASONRY 04 22 00-8 WASTE & STORM LINE REPLACEMENT DECEMBER 31, 2014 a. Limit the grout lift height to the bottom of the lowest bond beam more than 5 ft 4 in. above the bottom of the lift, but do not exceed a grout lift height of 12 ft 8 in. when the following conditions are met: 1) The masonry has cured for a minimum of 4 hours. 2) Grout slump is maintained between 10 and 11 in. b. When 3.7 E.1.a.1) or 2) above are not met, limit grout lift height to 5 ft 4 in. 2. Self-consolidating grout: a. When placed in masonry that has cured for a minimum 4 hours, place in lifts up to the grout pour height. b. When placed in masonry with less than 4 hours of cure, place in lifts not exceeding 5 ft 4 in. F. Grout consolidation: 1. Conventional grout: a. Consolidate grout pours 12 in. or less by mechanical vibration or puddling. b. Consolidate grout pours exceeding 12 in. by mechanical vibration, and reconsolidate after initial water loss and settlement has occurred. 2. Self-consolidating grout: consolidation or reconsolidation is not required. G. Grout keys are required between grout pours, or between lifts when the previous lift is permitted to set prior to placement of the subsequent lift. 1. Form grout key by terminating the grout a minimum of 11/2 in. below a mortar joint. 2. Do not form grout keys within beams. 3. At beams or lintels laid with closed bottom units, terminate the grout pour at the bottom of the beam or lintel without forming a grout key. 3.8 POINTING, AND CLEANING A. Point and tool holes in mortar joints to produce a uniform, tight joint. B. During construction, minimize any mortar or grout stains on the wall. Immediately remove any staining or soiling that occurs. 1. For precision or textured units, except as noted below, clean masonry by dry brushing before tooling joints. 2. For burnished, glazed, or pre-finished concrete masonry units, immediately remove any green mortar smears or soiling with a damp sponge. C. Final Cleaning: After mortar is thoroughly set and cured, clean exposed masonry surfaces of stains, efflorescence, mortar or grout droppings, and debris. 1. Use appropriate masonry cleaner as tested on the sample paneland as approved by the Design Professional, strictly following manufacturer's recommendations. 2. Do not use acids. D. At completion of masonry work, remove all scaffolding and equipment used during construction, and remove all debris, refuse, and surplus masonry material from the site. 1. Comply with Construction Waste Management plan. CORNELL UNIVERSITY DIVISION 4 - MASONRY Ithaca, New York SECTION 04 22 00 - CONCRETE UNIT MASONRY CLARA DICKSON HALL CONCRETE UNIT MASONRY 04 22 00-9 WASTE & STORM LINE REPLACEMENT DECEMBER 31, 2014 3.9 WATER REPELLENT APPLICATION A. Cleaning shall be complete and accepted by the Design Professional, and wall surfaces shall be thoroughly dry. B. Apply water repellent in strict accordance with Section 071900 and the water repellent manufacturer's instructions. END OF SECTION 042200