TG 04810 v06.08
Summary of Changes:
Reasons For Change: Prior TG 04810 v03.05 was met with comments from various local trade and engineering organizations when incorporated into our projects. The change to this Technical Guide and Specification addresses the following areas:
- Deletion of soft metric units
- Deletion of unbeneficial test reporting
- Sodium chloride content requirements for masonry units
- Quality Assurance Requirements
- Improved product information
- Clarification of subjective installation requirements
- Deletion of special quality assurance and inspection requirements for specific applications via use of half strength masonry units design methods
See Markup below (markup specification w/comments since changes numerous):
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Unit Masonry Assemblies TECHNICAL GUIDE |
TG 04810 |
1. COORDINATION ISSUES: Verify contractor’s quality control provisions for testing and payment methods.
2. DESIGN ISSUES:
2.1 Design the project using the soft metric system for reinforcing and indicate both the standard and soft metric sizes in a specification table or on drawings.[A1][A2]
2.2 Problem: Excess salt contamination of aggregates used in the manufacture of masonry units which resulted in the corrosion of metal in contact with the block such as door [A3]frames.[A4][A5]
2.2.1 Require manufacturer to maintain a quality control of aggregates in the plant and perform sampling of block.
2.1 Design wall and opening dimensions in block module to minimize cutting.
2.2 Structural Engineer to determine if horizontal joint reinforcing is necessary if in fully grouted walls with horizontal bond beams. It may be possible to omit the joint reinforcing in these situations. [A6]
2.3 Public Works Division prefers to reduce Special Inspections for masonry work. Accordingly, the Quality Assurance requirements in this TG are based upon the following Structural Design parameters:
2.3.1 Working Stress Design Method is used.
2.3.2 Quality Assurance provisions do not include requirements for Special Inspections as required by the Building Code.
2.3.3 One-half the allowable masonry stresses are used.
2.3.4 Maximum f'm is 1,500 psi.
2.3.5 Verification by the unit strength method of testing is used, which means that, for the parameters noted above, no testing is required for the masonry units or the grout. Consequently, there is no article on Field Quality Control.
2.3.6 The Consultant shall confirm the project structural design parameters with the Structural Engineer. If they differ from those noted above, the Consultant shall revise the Quality Assurance article and add a Field Quality Control article accordingly. Special Inspections may be required. The Consultant shall confirm with the Structural Engineer and the Project Coordinator. The Consultant and Structural Engineer shall refer to the applicable Building Code Chapters on Masonry and Special Inspections for these requirements.[A7]
3. DRAWING NOTES: (Not Used)
3.1 Indicate the Mortar Mix type (M, N, or S) on the drawings, based on the requirements of the different masonry assemblies. Note that this TG is based on the use of Type M or S, and if type N is required, the proportions for this mortar mix must be added to the specification.[A8]
4. STANDARD DRAWINGS: (Not Used)
5. SPECIFICATION NOTES: (Not Used)
2.2 Problem: Excess salt contamination of aggregates used in the manufacture of masonry units which resulted in the corrosion of metal in contact with the block such as door frames.
2.2.1 Require manufacturer to maintain a quality control of aggregates in the plant and perform sampling of block.
2.2 Design Wall and opening dimensions in block module to minimize cutting.
2.3 Structural Engineer to determine if horizontal joint reinforcing is necessary if fully grouted walls with horizontal bond beams. It may be possible to omit the joint reinforcing in these situations. [A9]
6. GUIDE SPECIFICATION:
6.1 Section 04810 Unit Masonry Assemblies
This specification covers normal weight concrete masonry units.
SPECIFIER’S NOTE: Blue colored italicized text is used for notes to the specifier and should be completely deleted from the final text. Where [Red colored italicized text in parentheses] is shown in this specification section, insert wording, numbers, etc. as appropriate and delete parentheses. Where <Red colored text in brackets> is shown, a choice is indicated. Make the appropriate choice and delete the brackets. Maintain footer notation with the current version used (e.g. TG 004810 v02.02). Verify that section titles cross referenced in this Section correspond to this Project's specifications; Section titles may have changed.
TG 04810 - UNIT MASONRY ASSEMBLIES
Part 1 - GENERAL
1.01 SUMMARY
A. Section includes unit masonry assemblies consisting of the following:
1. Concrete masonry units.
2. Mortar and grout.
3. Reinforcing steel.
4. Masonry joint reinforcement.
5. Ties and anchors.
6. Miscellaneous masonry accessories.
SPECIFIER NOTES: List below only products and construction that might be listed in this Section but are specified elsewhere.
B. Related Sections include the following:
1. Division 5 Section- “METAL FABRICATIONS” for loose steel lintels and shelf angles for the support of unit masonry assemblies. SECTION 02361 - “TERMITE CONTROL”.
2. Division 2 Section “Termite Control”. SECTION 05500 - “METAL FABRICATIONS” for loose steel lintels and shelf angles for the support of unit masonry assemblies.
3. SECTION 07840 – FIRESTOPPING.
3.4 Division 7 Sections SECTION 07929 “JOINT SEALANTS.: and “Firestopping”
4.5 Division 9 Section SECTION 09901 “PAINTING” testing for moisture and alkalinity.
6. SECTION 09902 – REPAINTING: testing for moisture and alkalinity.[A10]
1.02 DEFINITIONS
A. Reinforced Masonry: Masonry containing reinforcing steel in grouted cells.
SPECIFIER NOTES: As an UBC requirement, provide subparagraph 1.03.A.1 for facilities located in seismic Zones 3 & 4. Delete subparagraph 1.03.B.1 below if reinforcement shop drawings are not required. Delete paragraph 1.03.C.1 below if colors and textures are preselected and specified or scheduled.
1.03 SUBMITTALS
A. Product Data: For each different masonry unit, strength classification, additive, accessory, and other manufactured product specified.
1. Reinforcing steel - Certified mill test results or laboratory test results. Indicate bar size, yield strength, ultimate tensile strength, elongation and bend test. Provide chemical composition for rebars that are to be welded.
B. Shop Drawings: Show fabrication and installation details for the following:
1. Reinforcing Steel: Detail bending and placement of unit masonry reinforcing bars. Comply with ACI 315, “Details and Detailing of Concrete Reinforcement.”
C. Samples for Initial Selection: For the following:
1. Colored mortar samples showing the full range of colors available.
D. List of Materials Used in Constructing Sample Panels: List generic product names together with manufacturers, manufacturers’ product names, model numbers, lot numbers, batch numbers, source of supply, and other information as required to identify materials used. Include mix proportions for mortar and grout and source of aggregates.
E. Qualification Data: For firms and persons specified in “Quality Assurance” Article.
F. Material Certificates: Signed by manufacturers certifying that each of the following items complies with requirements:
1. Each masonry unit weight classification required: List aggregate source. [A11]
2 1. Each cement product required for mortar and grout, including name of manufacturer, brand, type, and weight slips at time of delivery.
3 2. Grout mixes. Include description of type and proportions of ingredients to assure compliance with the compressive strength in UBC Table 21-D.
3. Each material and grade indicated for reinforcing bars.
4. Each type and size of joint reinforcement.
5. Each type and size of anchor, tie, and metal accessory.
G. Test Reports:
1. Compressive Strength and Absorption: For each bearing masonry units.
a. From an independent testing agency, if specifically requested by DAGS.[A12]
b. Manufacturer’s tests shall be in accordance with UBC Standard 21-4 (ASTM C140) for conformance with the requirements of ASTM C90.
c. Frequency: Test per UBC Standard 21-4 requirements or at a minimum of [A13]one test per 1000 blocks delivered to Project.
2. Block salt content: If specifically requested by DAGS.[A14]
a. From plant quality control division.
b. Test: Content analysis showing percentage of chloride.
c. Frequency: One test for Project if project block is cast from aggregates from a single quarry. Perform additional tests if block made from aggregate from additional sources.
H. Quality Control Inspection Documents: Provide one copy of the following industry documents for use by DAGS Representative Contracting Officer.
1. NCMA TEK 8-2A (1972) (1998): Removal of Stains from Concrete Masonry Walls
1.04 QUALITY ASSURANCE
A. Testing Agency Qualifications: An independent testing agency, acceptable to authorities having jurisdiction, qualified according to ASTM C 1093 to conduct the testing indicated.[A15]
AB. Source Limitations for Masonry Units: Obtain exposed masonry units of a uniform texture and color, or a uniform blend within the ranges accepted for these characteristics, through one source from a single manufacturer for each product required.
1. Block plant shall maintain a quality control program to monitor and control block salt chloride ion content. Soluble chloride ion content should not exceed 0.30 per cent by volume of the cement material in the block, based on ACI 318-02 Table [A16]4.4.1.
BC. Source Limitations for Mortar Materials: Obtain mortar ingredients of a uniform quality, including color for exposed masonry, from one manufacturer for each cementitious component and from one source or producer for each aggregate.
SPECIFIER’S NOTE: Delete paragraph 1.04. C if fire-rated masonry is not used.
CD. Fire-Resistance Ratings: Where indicated, provide materials and construction identical to those of assemblies with fire-resistance ratings determined per ASTM E 119 by a testing and inspecting agency, by equivalent concrete masonry thickness, or by another means, as acceptable to authorities having jurisdiction.
SPECIFIER’S NOTE: : Retain this paragraph only when decorative concrete masonry units are shown on the drawings and specified. Otherwise delete the entire paragraph 1.04D. If retaining, D delete either subparagraph 1.04. D. or 1.04. D. 7. Paragraph 1.04. D. 7 is applicable if sample panel are erected as part of the building.
DE. Sample Panels: Before installing unit masonry, build sample panels as part of the work or on a separate footing provided by the Contractor, using materials indicated for the completed Work, to verify selections made under sample Submittals and to demonstrate aesthetic effects. Build sample panels for each type of exposed unit masonry assembly in sizes approximately 48 inches1200 mm long by 48 inches 1200 mm high by full thickness.
1. Locate panels in the locations indicated or, if not indicated, as directed by DAGS Representative Contracting Officer.
2. Clean exposed faces of panels with masonry cleaner indicated.
3. Where masonry is to match existing, erect panels adjacent and parallel to existing surface.
4. Protect approved sample panels from the elements with weather-resistant [A17]membrane.
54. Maintain sample panels during construction in an undisturbed condition as a standard for judging the completed Work.
65. Approval of sample panels is for color, texture, and blending of masonry units; relationship of mortar and sealant colors to masonry unit colors; tooling of joints; aesthetic qualities of workmanship; and other material and construction qualities specifically approved by Representative Contracting Officer in writing.
a. Approval of sample panels does not constitute approval of deviations from the Contract Documents contained in sample panels, unless such deviations are specifically approved by DAGS Representative Contracting Officer in writing.
76. Demolish and remove sample panels when directed.
87. Approved sample panels may become part of the completed Work if undisturbed at time of Substantial Completion.
SPECIFIER’S NOTE: Retain this paragraph only when decorative concrete masonry units are shown on the drawings and specified. Otherwise, D delete paragraph 1.04.F E. if work of this Section is not extensive or complex enough to justify a pre-installation conference. If retaining, coordinate with Division 1.[A18]
F E. Preinstallation Conference: Conduct conference at Project site to comply with requirements in Division 1 Section SECTION 01310 “PROJECT MANAGEMENT AND COORDINATION Meetings.”
1.05 DELIVERY, STORAGE, AND HANDLING
A. Store masonry units on elevated platforms in a dry location. Carefully stack and handle masonry units so as to prevent chipping, marring or cracking of corners, edges and faces.
B. Store cementitious materials on elevated platforms, under cover, and in a dry location. Do not use cementitious materials that have become damp.
C. Store aggregates where grading and other required characteristics can be maintained and contamination avoided.
D. Deliver preblended, dry mortar mix in moisture-resistant containers designed for lifting and emptying into dispensing silo. Store preblended, dry mortar mix in delivery containers on elevated platforms, under cover, and in a dry location or in a metal dispensing silo with weatherproof cover.
E. Store masonry accessories, including metal items, to prevent corrosion and accumulation of dirt and oil.
1.06 PROJECT CONDITIONS
A. Protection of Masonry: In rainy locations and conditions, cover tops of walls, projections and sills with waterproof sheeting to repel water.
B. Do not apply uniform floor or roof loads for at least 12 hours and concentrated loads for at least 3 days after building masonry walls or columns.
C. Stain Prevention: Protect to prevent stain damage to mar final finish or finishing techniques. Prevent grout, mortar, and soil from staining the face of masonry to be left exposed, stained or painted
D. Hot-Weather Requirements: Protect unit masonry work when temperature and humidity conditions produce excessive evaporation of water from mortar and grout. Provide artificial shade and wind breaks and use cooled materials as required.
1. When ambient temperature exceeds 90 deg F with a wind velocity greater than 8 mph, do not spread mortar beds more than 48 inches ahead of masonry. Set masonry units within one minute of spreading mortar.
PART 2 - PRODUCTS
2.01 CONCRETE MASONRY UNITS
SPECIFIER’S NOTE: Show details on Drawings of special conditions and special shapes needed. Revise subparagraph 2.01 below to suit Project.
A. General: Provide shapes indicated and as follows:
1. Provide special shapes for lintels, corners, jambs, sash, headers, bonding, and other special conditions.
2. Provide square-edged units for outside corners, unless indicated as bullnose.
3. Provide “H” blocks for below grade foundation walls and scheduled to be fully [A19]grouted.
SPECIFIER’S NOTE: Select the required Specify higher strength if required by the Structural Engineer, but confirm local availability. Also, note that requiring higher strength units may result in an f'm greater than 1,500 psi, and may change the requirements for Quality Assurance and Field Quality Control based on the Building Code. Confirm with the Structural Engineer.
B. Concrete Masonry Units: UBC Standard 21-4, [A20] ASTM C-90 and as follows:
1. Unit Compressive Strength: Provide load bearing units with minimum average net-area compressive strength of <1900><2150> psi.[A21]
2. Provide units, fully cured and reasonably free of cracks and chips on faces intended for exposure.[A22]
3. Composition: Manufacture from salt content controlled washed aggregate from a land source quarry. [A23]
4.2. Size (Width): Manufactured to the following dimensions within variations in dimensions only as permissible per ASTM C-90:
a. 4 inches nominal; 3-5/8 inches actual.
b. 6 inches nominal; 5-5/8 inches actual.
c. 8 inches nominal; 7-5/8 inches actual.
d. 10 inches nominal; 9-5/8 inches actual.
e. 12 inches nominal; 11-5/8 inches actual.
SPECIFIER’S NOTES: Include bricks, special textured units or decorative units when used in the project. Obtain confirmation from Project Coordinator to use other products.
53. Decorative Concrete Masonry Units, Screen Blocks: Shall be standard units manufactured to the same specifications as concrete masonry units. Pattern as shown on the drawings [or specified herein].
SPECIFIER’S NOTE: Coordinate requirements in this Article 2.02 with those in Article 2.11 Mortar and Grout Mixes.
2.02 MORTAR AND GROUT MATERIALS
A. Portland Cement: ASTM C 150, Type I or[A24] II. Provide natural color or white cement as required to produce mortar color indicated.
B. Mortar Cement: UBC Standard 21-14 Type as scheduled in mix designs in Article 2.11.
C. Masonry Cement: UBC Standard 21-11. Type as scheduled in mix designs in Article 2.11.
D. Aggregate for Mortar: ASTM C 144; except for joints less than [1/4 inch] thick, use aggregate graded with 100 percent passing the No. 16 sieve.[A25]
E. Aggregate for Grout: ASTM C 404.
F. Plasticizer Additive:
1. Acceptable for use in UBC Standard 21-14 Mortar Cement as a substitute for hydrated lime in masonry mortar.
a. Powder Type: Proprietary pozzolanic mortar plasticizer.
b. Liquid Type: Proprietary mixture of resins.
G. Mortar Pigments: Natural and synthetic iron oxides and chromium oxides, compounded for use in mortar mixes. Use only pigments with a record of satisfactory performance in masonry mortar.
H. Water for use in mixing Mortar and Grout: Potable and complying with ASTM C 94. Clean and free from injurious amounts of oils, acids alkalis, salts, organic materials or other substances that may be deleterious to both mortar and reinforcement.
SPECIFIER’S NOTES: Select paragraph 2.03.A for uncoated steel or paragraph 2.03.B for epoxy coated steel or both. If retaining both, show locations of each on Drawings or revise paragraph 2.03.B to indicate where epoxy-coated bars are required.
Grade 60 is standard. Confirm grade and show on the Drawings. Select paragraph 2.03.C if hot dipped galvanized reinforcing is necessary for the project.
2.03 REINFORCING STEEL
A. Uncoated Steel Reinforcing Bars: ASTM A 615/A 615M; ASTM A 616/A 616M, including Supplement 1; or ASTM A 617/A 617M, deformed, Grade 60 unless otherwise indicated on the drawings or specified herein.
B. Epoxy-Coated Reinforcing Steel: ASTM A 615/A 615M, Grade 60 unless otherwise indicated on the drawings; epoxy coated to comply with ASTM A 775/A 775M.
SPECIFIER’S NOTE: For paragraph 2.03.C, select type of reinforcement to be galvanized from subparagraph 2.03.C.1 below. Select weight of zinc coating from either subparagraph 2.03.C.2 below. Class I has at least 50 percent more weight of zinc than Class II.
C. Galvanized Reinforcing Bars: ASTM A 767/A 767M, hot-dip galvanized after fabrication and bending, of reinforcement type and zinc coating as follows:
1. Steel Reinforcement: <ASTM A 615/A 615M, Grade 60, deformed><ASTM A 706/A 706M , deformed>.
2. Zinc Coating: <Class I><Class II>
D. Preformed Steel Lintels: Structural steel meeting ASTM A 570 Grade C (Fy = 40 ksi, 276 MPa) minimum formed into various configurations to meet masonry opening requirements. Galvanize to meet ASTM A 525.
SPECIFIER’S NOTE: Retain paragraph 2.04 only when joint reinforcement is required by the masonry notes or details on the Structural Drawings. Otherwise, delete paragraph 2.04 [A26]entirely. If retaining, R retain one or two of the subparagraphs 2.04.A.1 through 2.04.A.3 below. Currently the trades use No. 9 gauge 0.14-inch wire because of lapping and meeting clearances or cover. If need to use the No. 7 gauge 0.1-inch, address lapping, clearance and cover concerns.
2.04 MASONRY JOINT REINFORCEMENT
A. General: UBC Standard 21-10 and ACI 530. 2.4C and as follows:
1. Hot-dip galvanized, carbon-steel wire for both interior and exterior walls.
2. Wire Size for Side Rods: No. 9 [0.14-inch] diameter.
3. Wire Size for Cross Rods: No. 9 [0.14-inch] diameter.
4. Provide in lengths of not less than 10 feet. Provide prefabricated corner and tee units in lengths not less than two feet where indicated.
B. For single-wythe masonry, provide either ladder or truss type with single pair of side rods and cross rods spaced not more than 16 inches o.c.
2.05 TIES AND ANCHORS, GENERAL
A. General: Provide ties and anchors, specified in subsequent articles, made from materials that comply with this Article, unless otherwise indicated.
B. Hot-Dip Galvanized Carbon-Steel Wire: ASTM A 82; with ASTM A 153, Class B-2 coating.
C. Stainless-Steel Wire: ASTM A 580/A 580M, Type 316.
D. Stainless-Steel Sheet: ASTM A 666, Type 316.
SPECIFIER’S NOTE: Edit subparagraphs 2.06.A.1 and 2.06.A.2 to suit project.
2.06 ADJUSTABLE ANCHORS FOR CONNECTING TO STEEL FRAME
A. General: Provide two-piece assemblies that allow vertical or horizontal adjustment but resist tension and compression forces perpendicular to plane of wall.
1. Anchor Section: Crimped [1/4-inch] diameter, <hot-dip galvanized steel> <stainless-steel> wire anchor section for welding to steel. [Mill galvanized wire may be used at interior walls where humidity does not exceed 75 percent.]
2. Tie Section: Triangular-shaped wire tie, sized to extend within [1-inch] of masonry face, made from <0.1875-inch><0.25-inch> diameter, <hot-dip galvanized steel> <stainless-steel> wire. [Mill galvanized wire may be used at interior walls where humidity does not exceed 75 percent.]
SPECIFIER’S NOTE: Edit subparagraphs 2.07.A.1 and 2.07.A.2 to suit project.
2.07 ANCHORS FOR CONNECTING TO CONCRETE
A. General: Provide two-piece assemblies that allow vertical or horizontal adjustment but resist tension and compression forces perpendicular to plane of wall.
1. Anchor Section: Dovetail anchor section formed from <0.0528-inch thick (16 gauge), steel sheet, galvanized after fabrication> <0.0966-inch thick (12 gauge), steel sheet, galvanized after fabrication> <0.0625-inch thick (16 gauge), stainless-steel sheet> <0.1094-inch thick (12 gauge), stainless-steel sheet>. <0.064-inch thick (16 gauge), galvanized sheet may be used at interior walls where humidity does not exceed 75 percent.> <0.108-inch thick (12 gauge), galvanized sheet may be used at interior walls where humidity does not exceed 75 percent.>
2. Tie Section: Triangular-shaped wire tie, sized to extend within [1-inch] of masonry face, made from <0.1875-inch> <0.25-inch> diameter, <hot-dip galvanized steel><stainless-steel> wire. [Mill galvanized wire may be used at interior walls where humidity does not exceed 75 percent.]
2.08 MISCELLANEOUS ANCHORS
A. Unit Type Inserts in Concrete: Cast-iron or malleable-iron inserts of type and size indicated.
B. Dovetail Slots: Furnish dovetail slots with filler strips, of slot size indicated, fabricated from [0.0336-inch] (20 gauge), galvanized steel sheet.
C. Anchor Bolts: Steel bolts complying with ASTM A 307, Grade A (ASTM F 568, Property Class 4.6); with ASTM A 563 (ASTM A 563M) hex nuts and, where indicated, flat washers; hot-dip galvanized to comply with ASTM A 153, Class C; of diameter and length indicated and in the following configurations:
1. Headed bolts.
2. Non-headed bolts, bent in manner indicated.
SPECIFIER’S NOTES: Usually delete paragraph 2.08.D and subparagraphs and include in Sections that covering items anchored.
D. Post-installed Anchors: Anchors as described below, with capability to sustain, without failure, load imposed within factors of safety indicated, as determined by testing per ASTM E 488, conducted by a qualified independent testing agency.
1. Type: Chemical anchors.
2. Type: Expansion anchors.
3. Type: Undercut anchors.
SPECIFIER’S NOTES: Subparagraphs 2.08.D.4 and 2.08.D.5 are examples only. Subparagraph 2.08.D.4 protects against corrosion from an indoor atmosphere; revise to suit other service conditions after verifying availability of thicker coatings. Type 316 Stainless steel is recommended for exterior or humid conditions.
4. Corrosion Protection: Carbon-steel components zinc plated to comply with ASTM B 633, Class Fe/Zn 5 (5 microns) for Class SC 1 service condition (mild).
5. Corrosion Protection: Stainless-steel components complying with ASTM F 593 and ASTM F 594, Alloy Group 1 or 2 (ASTM F 738M and ASTM F 836M, Alloy Group 1 or 4) for bolts and nuts; ASTM A 666 or ASTM A 276, Type 316, for anchors.
SPECIFIER’S NOTES: Subparagraph 2.08.D.6 is an example only; verify safety factors to suit anchorage conditions and types of anchors indicated. Overhead, vibratory, and other critical loads generally require higher safety factors. Insert other kinds of anchors as required.
6. For Post-installed Anchors in Concrete: Capability to sustain, without failure, a load equal to four times the loads imposed.
2.09 MISCELLANEOUS MASONRY ACCESSORIES
A. Compressible Filler: Premolded filler strips complying with ASTM D 1056, Grade 2A1; compressible up to 35 percent; of width and thickness indicated; formulated from <neoprene>, <urethane> <or> <PVC>.
B. Preformed Control-Joint Gaskets: Material as indicated below, designed to fit standard sash block and to maintain lateral stability in masonry wall; size and configuration as indicated.
1. Styrene-Butadiene-Rubber Compound: ASTM D 2000, Designation M2AA-805, or
2. PVC: ASTM D 2287, Type PVC-65406.
C. Bond-Breaker Strips: Asphalt-saturated, organic roofing felt complying with ASTM D 226, Type I (No. 15 asphalt felt).
D. Reinforcing Bar Positioners: Commercial plastic or wire units designed to fit into mortar bed joints spanning masonry unit cells with loops for holding reinforcing bars in center of cells. Units are formed from <0.142-inch> <0.187-inch> steel wire, hot-dip galvanized after fabrication. Commercial plastic units are fabricated for the intended purpose.
1. Provide units with either two loops or four loops as needed for number of bars indicated.
SPECIFIER’S NOTE: The listed products and manufacturer are available through local suppliers and are included for reference. Contractors’ submittals are to be checked for compliance.
Available Products: Subject to compliance with requirements, products that may be incorporated into the Work include, but are not limited to, the following:
1. Reinforcing Bar Positioners
a. D/A 810, 811; Dur-O-Wal, Inc.
b. D/A 815, 816, 817; Dur-O-Wal, Inc.
c. No. 376 Rebar Positioner; Heckman Building Products, Inc.
d. #RB Rebar Positioner; Hohmann & Barnard, Inc.
e. #RB-Twin Rebar Positioner; Hohmann & Barnard, Inc.
f. Double O-Ring Rebar Positioner; Masonry Reinforcing Corporation of America.
g. O-Ring Rebar Positioner; Masonry Reinforcing Corporation of America.
2. Other suitable devices: Other suitable devices may be used, upon proper submittal to and approval by Contracting Officer.
SPECIFIER’S NOTE: Insert other masonry accessories as needed for the Project.
E. Adhesive: Type recommended by insulation board manufacturer for application indicated.
SPECIFIER’S NOTE: Tetrasodium polyphosphate is the cleaning agent in “Spic and Span,” replacing the previous cleaning agent trisodium phosphate. The new agent is less damaging to the environment. Verify acceptability of paragraph 2.10.B for cleaning masonry with pigmented mortar joints.
2.10 MASONRY CLEANERS
A. Job-Mixed Detergent Solution: Solution of [½-cup] dry measure tetrasodium polyphosphate and [½-cup] dry measure laundry detergent dissolved in [1-gallon] of water.
B. Proprietary Acidic Cleaner: Manufacturer’s standard-strength cleaner designed for removing mortar or grout stains, efflorescence, and other new construction stains from new masonry without discoloring or damaging masonry surfaces. Use product expressly approved for intended use by cleaner manufacturer and manufacturer of masonry units being cleaned.
2.11 MORTAR AND GROUT MIXES
A. General: Do not use admixtures, including pigments, air-entraining agents, accelerators, retarders, water-repellent agents, antifreeze compounds, or other admixtures, unless otherwise indicated.
1. Do not use calcium chloride in mortar or grout.
B. Pre-blended, Dry Mortar Mix: Furnish dry mortar ingredients in the form of a pre-blended mix. Measure quantities by weight to ensure accurate proportions, and thoroughly blend ingredients before delivering to Project the job site.
C. Mortar for Unit Masonry:
1. The proportioning of materials for mortar and grout shall be by volume and done in such manner that the specified proportions can be controlled and accurately maintained. Measure fine aggregate in a damp loose condition. Mix materials in a mechanical batch mixer for at least 3 minutes for mortar and 5 minutes for grout, but do not mix more than 10 minutes. Hand mixing is permitted only for small batches of 3 cubic feet or less.
2. Prepare Mortar Mix Design 1 with sufficient water to provide a workable consistency. Use and place mortar within 1-1/2 hours after mixing.
3. Prepare Mortar Mix Designs 2 through 5 strictly in accordance with the admixture manufacturer’s instructions. Place mortar within 2-1/2 hours after mixing. No materials which start to set shall be retempered.
D. Mortar Mix Designs: Mortar shall be freshly prepared and uniformly mixed in one of the following proportions unless directed otherwise by manufacturer of plasticizer additive:
1. Mortar Mix 1;
Type M Mortar
1 part masonry cement
2-1/2 to 3 parts mortar aggregate
2. Mortar Mix 2;
Type M Mortar
2 sacks portland cement
1/2 to 1 bag powdered plasticizer additive (7 pound bag)
6 cu. ft. mortar aggregate
3. Mortar Mix 3;
Type M Mortar:
1 sack portland cement
3 ounces liquid plasticizer additive
2-1/4 to 2-3/4 cu. ft. mortar aggregate
4. Mortar Mix 4;
Type S Mortar:
2 sacks portland cement
1 bag powdered plasticizer additive (7 pound bag)
9 cu. ft. mortar aggregate
5. Mortar Mix 5;
Type S Mortar
1 sack portland cement
3 ounces liquid plasticizer additive
2-1/2 to 3 cu. ft. mortar aggregate