HomeMy WebLinkAbout04 22 00 Concrete Unit MasonaryBEARDSLEY DESIGN ASSOCIATES
CORNELL - NCP CONCRETE UNIT MASONRY
STANDARD SPECIFICATIONS 04 22 00 – PAGE 1 of 8
MARCH 29, 2013
SECTION 042200 - CONCRETE UNIT MASONRY
PART 1 GENERAL
1.1 DEFINITIONS
A. CMU(s): Concrete masonry unit(s).
B. Reinforced Masonry: Masonry containing reinforcing steel in grouted cells.
1.2 SUBMITTALS
A. Product Data: For each type of product indicated.
PART 2 PRODUCTS
2.1 MASONRY UNITS, GENERAL
A. Defective Units: Referenced masonry unit standards may allow a certain
percentage of units to contain chips, cracks, or other defects exceeding limits
stated in the standard. Do not use units where such defects will be exposed
in the completed Work.
B. Fire-Resistance Ratings: Where indicated, provide units that comply with
requirements for fire-resistance ratings indicated as determined by testing
according to ASTM E 119, by equivalent masonry thickness, or by other
means, as acceptable to authorities having jurisdiction.
2.2 CONCRETE MASONRY UNITS
A. CMUs: ASTM C 90.
1. Unit Compressive Strength: Provide units with minimum average net-area
compressive strength of 2150 psi (14.8 MPa).
2. Density Classification: Normal weight.
3. Size (Width): Manufactured to dimensions 3/8 inch less than nominal
dimensions.
2.3 MORTAR AND GROUT MATERIALS
A. Portland Cement: ASTM C 150, Type I or II, except Type III may be used for
cold-weather construction. Provide natural color or white cement as required
to produce mortar color indicated.
B. Hydrated Lime: ASTM C 207, Type S.
C. Portland Cement-Lime Mix: Packaged blend of portland cement and
hydrated lime containing no other ingredients.
D. Aggregate for Mortar: ASTM C 144.
1. For mortar that is exposed to view, use washed aggregate consisting of
natural sand or crushed stone.
BEARDSLEY DESIGN ASSOCIATES
CORNELL - NCP CONCRETE UNIT MASONRY
STANDARD SPECIFICATIONS 04 22 00 – PAGE 2 of 8
MARCH 29, 2013
2. For joints less than 1/4 inch (6 mm) thick, use aggregate graded with 100
percent passing the No. 16 (1.18-mm) sieve.
3. White-Mortar Aggregates: Natural white sand or crushed white stone.
4. Colored-Mortar Aggregates: Natural sand or crushed stone of color
necessary to produce required mortar color.
E. Aggregate for Grout: ASTM C 404.
F. Water: Potable.
2.4 REINFORCEMENT
A. Uncoated Steel Reinforcing Bars: ASTM A 615/A 615M or
ASTM A 996/A 996M, Grade 60 (Grade 420).
B. Masonry Joint Reinforcement, General: ASTM A 951/A 951M.
1. Interior Walls: Hot-dip galvanized, carbon steel.
2. Exterior Walls: Hot-dip galvanized steel.
3. Wire Size for Side Rods: 0.148-inch (3.77-mm) diameter.
4. Wire Size for Cross Rods: 0.148-inch (3.77-mm) diameter.
5. Spacing of Cross Rods, Tabs, and Cross Ties: Not more than 16 inches
(407 mm) o.c.
6. Provide in lengths of not less than 10 feet (3 m).
C. Masonry Joint Reinforcement for Single-Wythe Masonry: Either ladder or
truss type with single pair of side rods.
2.5 TIES AND ANCHORS
A. Materials: Provide ties and anchors specified in this article that are made
from materials that comply with the following unless otherwise indicated.
1. Hot-Dip Galvanized, Carbon-Steel Wire: ASTM A 82/A 82M; with
ASTM A 153/A 153M, Class B-2 coating.
2. Galvanized Steel Sheet: ASTM A 653/A 653M, Commercial Steel, G60
(Z180) zinc coating.
3. Steel Sheet, Galvanized after Fabrication: ASTM A 1008/A 1008M,
Commercial Steel, with ASTM A 153/A 153M, Class B coating.
4. Steel Plates, Shapes, and Bars: ASTM A 36/A 36M.
B. Partition Top anchors: 0.105-inch- (2.66-mm-) thick metal plate with 3/8-inch-
(9.5-mm-) diameter metal rod 6 inches (152 mm) long welded to plate and
with closed-end plastic tube fitted over rod that allows rod to move in and out
of tube. Fabricate from steel, hot-dip galvanized after fabrication].
1. Corrosion Protection: Hot-dip galvanized to comply with
ASTM A 153/A 153M.
2.6 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.
BEARDSLEY DESIGN ASSOCIATES
CORNELL - NCP CONCRETE UNIT MASONRY
STANDARD SPECIFICATIONS 04 22 00 – PAGE 3 of 8
MARCH 29, 2013
1. Do not use calcium chloride in mortar or grout.
2. Use portland cement-lime mortar unless otherwise indicated.
3. For exterior masonry, use portland cement-lime mortar.
4. For reinforced masonry, use portland cement-lime mortar.
B. Preblended, Dry Mortar Mix: Furnish dry mortar ingredients in form of a
preblended mix. Measure quantities by weight to ensure accurate
proportions, and thoroughly blend ingredients before delivering to Project site.
C. Mortar for Unit Masonry: Comply with ASTM C 270, Property Specification.
Provide the following types of mortar for applications stated unless another
type is indicated.
1. For reinforced masonry, use Type S .
2. For interior non-load-bearing partitions, Type O may be used instead of
Type N.
D. Grout for Unit Masonry: Comply with ASTM C 476.
1. Use grout of type indicated or, if not otherwise indicated, of type (fine or
coarse) that will comply with Table 1.15.1 in ACI 530.1/ASCE 6/TMS 602
for dimensions of grout spaces and pour height.
2. Proportion grout in accordance with ASTM C 476, Table 1.
3. Provide grout with a slump of 8 to 11 inches (203 to 279 mm) as
measured according to ASTM C 143/C 143M.
PART 3 EXECUTION
3.1 EXAMINATION
A. Examine conditions, with Installer present, for compliance with requirements
for installation tolerances and other conditions affecting performance of the
Work.
1. For the record, prepare written report, endorsed by Installer, listing
conditions detrimental to performance of work.
2. Verify that foundations are within tolerances specified.
3. Verify that reinforcing dowels are properly placed.
B. Before installation, examine rough-in and built-in construction for piping
systems to verify actual locations of piping connections.
C. Proceed with installation only after unsatisfactory conditions have been
corrected.
3.2 INSTALLATION, GENERAL
A. Build chases and recesses to accommodate items specified in this and other
Sections.
B. Leave openings for equipment to be installed before completing masonry.
After installing equipment, complete masonry to match the construction
immediately adjacent to opening.
BEARDSLEY DESIGN ASSOCIATES
CORNELL - NCP CONCRETE UNIT MASONRY
STANDARD SPECIFICATIONS 04 22 00 – PAGE 4 of 8
MARCH 29, 2013
C. Use full-size units without cutting if possible. If cutting is required to provide a
continuous pattern or to fit adjoining construction, cut units with motor-driven
saws; provide clean, sharp, unchipped edges. Allow units to dry before
laying unless wetting of units is specified. Install cut units with cut surfaces
and, where possible, cut edges concealed.
3.3 TOLERANCES
A. Dimensions and Locations of Elements:
1. For dimensions in cross section or elevation do not vary by more than plus
1/2 inch (12 mm) or minus 1/4 inch (6 mm).
2. For location of elements in plan do not vary from that indicated by more
than plus or minus 1/2 inch (12 mm).
3. For location of elements in elevation do not vary from that indicated by
more than plus or minus 1/4 inch (6 mm) in a story height or 1/2 inch (12
mm) total.
B. Lines and Levels:
1. For bed joints and top surfaces of bearing walls do not vary from level by
more than 1/4 inch in 10 feet (6 mm in 3 m), or 1/2 inch (12 mm)
maximum.
2. For conspicuous horizontal lines, such as lintels, sills, parapets, and
reveals, do not vary from level by more than 1/8 inch in 10 feet (3 mm in 3
m), 1/4 inch in 20 feet (6 mm in 6 m), or 1/2 inch (12 mm) maximum.
3. For vertical lines and surfaces do not vary from plumb by more than 1/4
inch in 10 feet (6 mm in 3 m), 3/8 inch in 20 feet (9 mm in 6 m), or 1/2 inch
(12 mm) maximum.
4. For conspicuous vertical lines, such as external corners, door jambs,
reveals, and expansion and control joints, do not vary from plumb by more
than 1/8 inch in 10 feet (3 mm in 3 m), 1/4 inch in 20 feet (6 mm in 6 m), or
1/2 inch (12 mm) maximum.
5. For lines and surfaces do not vary from straight by more than 1/4 inch in
10 feet (6 mm in 3 m), 3/8 inch in 20 feet (9 mm in 6 m), or 1/2 inch (12
mm) maximum.
6. For vertical alignment of exposed head joints, do not vary from plumb by
more than 1/4 inch in 10 feet (6 mm in 3 m), or 1/2 inch (12 mm)
maximum.
C. Joints:
1. For bed joints, do not vary from thickness indicated by more than plus or
minus 1/8 inch (3 mm), with a maximum thickness limited to 1/2 inch (12
mm).
2. For exposed bed joints, do not vary from bed-joint thickness of adjacent
courses by more than 1/8 inch (3 mm).
3. For head and collar joints, do not vary from thickness indicated by more
than plus 3/8 inch (9 mm) or minus 1/4 inch (6 mm).
4. For exposed head joints, do not vary from thickness indicated by more
than plus or minus 1/8 inch (3 mm).
BEARDSLEY DESIGN ASSOCIATES
CORNELL - NCP CONCRETE UNIT MASONRY
STANDARD SPECIFICATIONS 04 22 00 – PAGE 5 of 8
MARCH 29, 2013
3.4 LAYING MASONRY WALLS
A. Lay out walls in advance for accurate spacing of surface bond patterns with
uniform joint thicknesses and for accurate location of openings, movement-
type joints, returns, and offsets. Avoid using less-than-half-size units,
particularly at corners, jambs, and, where possible, at other locations.
B. Bond Pattern for Exposed Masonry: Unless otherwise indicated, lay exposed
masonry in running bond ; do not use units with less than nominal 4-inch
(100-mm) horizontal face dimensions at corners or jambs.
C. Lay concealed masonry with all units in a wythe in running bond . Bond and
interlock each course of each wythe at corners. Do not use units with less
than nominal 4-inch (100-mm) horizontal face dimensions at corners or
jambs.
D. Stopping and Resuming Work: Stop work by racking back units in each
course from those in course below; do not tooth. When resuming work, clean
masonry surfaces that are to receive mortar before laying fresh masonry.
E. Built-in Work: As construction progresses, build in items specified in this and
other Sections. Fill in solidly with masonry around built-in items.
F. Fill space between steel frames and masonry solidly with mortar unless
otherwise indicated.
G. Where built-in items are to be embedded in cores of hollow masonry units,
place a layer of metal lath, wire mesh, or plastic mesh in the joint below and
rod mortar or grout into core.
H. Fill cores in hollow CMUs with grout 24 inches (600 mm) under bearing
plates, beams, lintels, posts, and similar items unless otherwise indicated.
I. Build non-load-bearing interior partitions full height of story to underside of
solid floor or roof structure above unless otherwise indicated.
1. Install compressible filler in joint between top of partition and underside of
structure above.
2. Fasten partition top anchors to structure above and build into top of
partition. Grout cells of CMUs solidly around plastic tubes of anchors and
push tubes down into grout to provide 1/2-inch (13-mm) clearance
between end of anchor rod and end of tube. Space anchors 48 inches
o.c. unless otherwise indicated.
3. Wedge non-load-bearing partitions against structure above with small
pieces of tile, slate, or metal. Fill joint with mortar after dead-load
deflection of structure above approaches final position.
4. At fire-rated partitions, treat joint between top of partition and underside of
structure above to comply with Division 07 Section "Fire-Resistive Joint
Systems."
BEARDSLEY DESIGN ASSOCIATES
CORNELL - NCP CONCRETE UNIT MASONRY
STANDARD SPECIFICATIONS 04 22 00 – PAGE 6 of 8
MARCH 29, 2013
3.5 MORTAR BEDDING AND JOINTING
A. Lay hollow CMUs as follows:
1. With face shells fully bedded in mortar and with head joints of depth equal
to bed joints.
2. With webs fully bedded in mortar in all courses of piers, columns, and
pilasters.
3. With webs fully bedded in mortar in grouted masonry, including starting
course on footings.
4. With entire units, including areas under cells, fully bedded in mortar at
starting course on footings where cells are not grouted.
B. Lay solid masonry units with completely filled bed and head joints; butter
ends with sufficient mortar to fill head joints and shove into place. Do not
deeply furrow bed joints or slush head joints.
C. Tool exposed joints slightly concave when thumbprint hard, using a jointer
larger than joint thickness unless otherwise indicated.
D. Cut joints flush for masonry walls to receive plaster or other direct-applied
finishes (other than paint) unless otherwise indicated.
3.6 MASONRY JOINT REINFORCEMENT
A. General: Install entire length of longitudinal side rods in mortar with a
minimum cover of 5/8 inch (16 mm) on exterior side of walls, 1/2 inch (13
mm) elsewhere. Lap reinforcement a minimum of 6 inches (150 mm).
1. Space reinforcement not more than 16 inches (406 mm) o.c.
2. Space reinforcement not more than 8 inches (203 mm) o.c. in foundation
walls and parapet walls.
3. Provide reinforcement not more than 8 inches (203 mm) above and below
wall openings and extending 12 inches (305 mm) beyond openings[ in
addition to continuous reinforcement].
B. Interrupt joint reinforcement at control and expansion joints unless otherwise
indicated.
C. Provide continuity at wall intersections by using prefabricated T-shaped units.
D. Provide continuity at corners by using prefabricated L-shaped units.
E. Cut and bend reinforcing units as directed by manufacturer for continuity
at corners, returns, offsets, column fireproofing, pipe enclosures, and other
special conditions.
3.7 LINTELS
A. Provide concrete lintels where shown and where openings of more than 12
inches (305 mm) for brick-size units and 24 inches (610 mm) for block-size
units are shown without structural steel or other supporting lintels.
BEARDSLEY DESIGN ASSOCIATES
CORNELL - NCP CONCRETE UNIT MASONRY
STANDARD SPECIFICATIONS 04 22 00 – PAGE 7 of 8
MARCH 29, 2013
B. Provide minimum bearing of 8 inches (200 mm) at each jamb unless
otherwise indicated.
3.8 REINFORCED UNIT MASONRY INSTALLATION
A. Temporary Formwork and Shores: Construct formwork and shores as
needed to support reinforced masonry elements during construction.
1. Construct formwork to provide shape, line, and dimensions of completed
masonry as indicated. Make forms sufficiently tight to prevent leakage of
mortar and grout. Brace, tie, and support forms to maintain position and
shape during construction and curing of reinforced masonry.
2. Do not remove forms and shores until reinforced masonry members have
hardened sufficiently to carry their own weight and other loads that may be
placed on them during construction.
B. Placing Reinforcement: Comply with requirements in
ACI 530.1/ASCE 6/TMS 602.
C. Grouting: Do not place grout until entire height of masonry to be grouted has
attained enough strength to resist grout pressure.
1. Comply with requirements in ACI 530.1/ASCE 6/TMS 602 for cleanouts
and for grout placement, including minimum grout space and maximum
pour height.
2. Limit height of vertical grout pours to not more than 60 inches (1520 mm).
3.9 REPAIRING, POINTING, AND CLEANING
A. Remove and replace masonry units that are loose, chipped, broken, stained,
or otherwise damaged or that do not match adjoining units. Install new units
to match adjoining units; install in fresh mortar, pointed to eliminate evidence
of replacement.
B. Pointing: During the tooling of joints, enlarge voids and holes, except weep
holes, and completely fill with mortar. Point up joints, including corners,
openings, and adjacent construction, to provide a neat, uniform appearance.
Prepare joints for sealant application, where indicated.
C. In-Progress Cleaning: Clean unit masonry as work progresses by dry
brushing to remove mortar fins and smears before tooling joints.
D. Final Cleaning: After mortar is thoroughly set and cured, clean exposed
masonry as follows:
1. Remove large mortar particles by hand with wooden paddles and
nonmetallic scrape hoes or chisels.
2. Test cleaning methods on sample wall panel; leave one-half of panel
uncleaned for comparison purposes. Obtain Architect's approval of
sample cleaning before proceeding with cleaning of masonry.
3. Protect adjacent stone and nonmasonry surfaces from contact with
cleaner by covering them with liquid strippable masking agent or
polyethylene film and waterproof masking tape.
BEARDSLEY DESIGN ASSOCIATES
CORNELL - NCP CONCRETE UNIT MASONRY
STANDARD SPECIFICATIONS 04 22 00 – PAGE 8 of 8
MARCH 29, 2013
4. Wet wall surfaces with water before applying cleaners; remove cleaners
promptly by rinsing surfaces thoroughly with clear water.
5. Clean concrete masonry by cleaning method indicated in NCMA TEK 8-
2A applicable to type of stain on exposed surfaces.
END OF SECTION 422200