July 22, 1994

Contract #TW0592

SPECIAL SPECIFICATION

SECTION 04220-S

[CONCRETE MASONRY]{.underline}

[Page]{.underline}

[PART 1 - GENERAL]{.underline}

1.01 Summary 2

1.02 References 2

1.03 Submittals 2

1.04 Delivery, Storage, and Handling 3

1.05 Environmental Requirements 3

[PART 2 - PRODUCTS]{.underline}

2.01 Concrete Masonry Units 4

2.02 Mortar 4

2.03 Grout 4

2.04 Reinforcement and Accessory Materials 5

[PART 3 - EXECUTION]{.underline}

3.01 Examination 5

3.02 Reinforcement Installation 5

3.03 Masonry Installation 6

3.04 Tolerances 6

3.05 Field Quality Control 6

3.06 Cleaning and Adjusting 6

3.07 Protection 7

SPECIAL SPECIFICATION

SECTION 04220-S

[CONCRETE MASONRY]{.underline}

# PART 1 - GENERAL

## 1.01 [SUMMARY]{.underline}

A. Section includes: Furnishing and installation of concrete masonry
units, grout, mortar, reinforcement, and masonry accessories.

## 1.02 [REFERENCES]{.underline}

A. ASTM A-82, Rev. A-90, Specification for Steel Wire, Plain, for
Concrete Reinforcement.

B. ASTM A-153-82, Specification for Zinc-Coating (Hot-Dip) on Iron and
Steel Hardware.

C. ASTM A-615M, Rev. A-92, Specification for Deformed and Plain
Billet-Steel Bars for Concrete Reinforcement.

D. ASTM C-90, Rev. B-92, Specifications for Load-Bearing Concrete
Masonry Units.

E. ASTM C-144-E1-91, Specifications for Aggregate for Masonry Mortars.

F. ASTM C-150-92, Specifications for Portland Cement.

G. ASTM C-207-E1-91, Specifications for Hydrated Lime for Masonry
Purposes.

H. ASTM C-270, Rev. A-92, Specifications for Mortar for Unit Masonry.

I. ASTM C-476-91, Specification for Grout for Masonry.

J. UL.

## 1.03 [SUBMITTALS]{.underline}

A. Shop Drawings

1\. Submit shop drawings for reinforcement placement.

B. Catalog Data

1\. Submit data assuring units conform to ASTM C-90 Grade N, Type 1,
normal weight.

2\. Submit data assuring mortar conforms to ASTM C-270 Type S.

3\. Submit data assuring grout conforms to ASTM C-476.

4\. Submit data assuring reinforcement conforms to ASTM A-615 and ASTM
A-82 and galvanizing conforms to ASTM A-153, Class B2, 1.5 ounce zinc.

5\. Submit data assuring control joints are preformed neoprene, Shore A
durometer hardness of 60 to 80 with corner and tee items, fused joints.

C. Installation Instructions

1\. Submit manufacturer's installation instructions for control joint
materials.

D. Special

1\. Submit letter of certification from the manufacturer assuring the
units have a minimum compressive strength of 2800 psi.

2\. Submit letter of certification from a testing agency assuring the
grout has a minimum compressive strength of 2800 psi.

3\. Submit letter of certification from the manufacturer of the units
assuring compliance with the fire rating requirements.

## 1.04 [DELIVERY, STORAGE, AND HANDLING]{.underline}

A. Deliver and store masonry and material on pallets and protect from
rain, snow, and soilage.

B. Store materials to avoid overloading any structure or portion
thereof.

## 1.05 [ENVIRONMENTAL REQUIREMENTS]{.underline}

A. Cold Weather Protection

1\. Do not construct masonry when temperature is below 32 degrees F at
times of predicted rising temperature or below 40 degrees F at time of
falling temperature.

2\. Use materials that are free of frost and ice and above 36 degrees F
at time of use.

3\. Maintain installed masonry above 36 degrees F for a period of 48
hours after laying.

B. Hot Weather Protection

1\. Protect masonry construction from direct exposure to wind and sun
when erected in an ambient air temperature of 90 degrees F (32 degrees
C) or greater in the shade, with relative humidity less than 50 percent,
or when the relative humidity is less than 40 percent at any
temperature, for at least 24 hours. Dampen, but do not saturate, all
concrete masonry units immediately before installation.

# PART 2 - PRODUCTS

2.01 [CONCRETE MASONRY UNITS: ASTM C-90;]{.underline} Grade N, Type 1,
normal weight.

A. Manufacturer: Obtain masonry units from one manufacturer; of uniform
texture and color for each kind required for each continuous area and
visually related area.

B. Manufacturer\'s standard units with nominal face dimensions of 16
inches long by 8 inches high (15-5/8\" x 7-5/8\"), with a minimum
compressive strength of 2800 psi.

C. Special Shapes: Provide where required for lintels, corners, jambs,
sash, control joints, headers, bonding and other special conditions.

## 2.02 [MORTAR: ASTM C-270; Specification for Mortar for Unit Masonry]{.underline}

A. General: Under no conditions shall air entrainment be used in mortar.
Under no conditions shall masonry cement be used for mortar.

B. Portland Cement: ASTM C-150, Type I, except Type III may be used for
cold weather construction.

C. Hydrated Lime: ASTM C-207, Type S.

D. Water: Clean and potable.

E. Sand: ASTM C-144.

F. Type: Mortar mix proportions per ASTM C-270, Type S.

1\. 1/4 to 1/2 lime to 1 Portland cement. Sand ratio measured in damp,
loose conditions not less than 2-1/4 and not more than 3 times the sum
of separate volumes of cementitious materials.

## 2.03 [GROUT: ASTM C-476; Specification for Grout for Masonry]{.underline}

A. Portland cement: ASTM C-150, Type I.

B. Hydrated Lime: ASTM C-207, Type S

C. Water: Clean and portable

D. Aggregate: ASTM C-404, coarse aggregate size No. 8 and fine aggregate
size No. 1

E. Proportions: 2800 psi compressive strength

## 2.04 [REINFORCEMENT AND ACCESSORY MATERIALS]{.underline}

A. Continuous Wire Reinforcing

1\. Single Wythe Joint Reinforcement: ASTM A-82, truss-type, 9-gage
cold-drawn steel wire, deformed continuous side rods and plain cross
rods, and a 1-1/2-inch to 2-inch width less than the thickness of wall.

2\. Corner and Wall Intersections: ASTM A-82, prefabricated tees and
corner sections.

3\. Coating: ASTM A-153, Class B2, hot-dip galvanized, 1.5-ounce zinc.

B. Accessories

1\. Control Joints: Preformed neoprene, Shore A durometer hardness of 60
to 80, with corner and tee items, fused joints.

2\. Nonmetallic Expansion Joint Strips: Provide premolded, compressible,
elastic fillers of foam rubber, neoprene, or extruded plastic.

3\. Cleaning Solutions: Nonacidic and not harmful to masonry work or
adjacent materials.

# PART 3 - EXECUTION

## 3.01 [EXAMINATION]{.underline}

A. Examine areas to receive masonry for cleanliness, accuracy in
dimension and grade, structural capacity of the work, and scaffolds to
receive the masonry load and ensure that imbedded and adjacent features
are in place.

B. Inspect masonry units for cleanliness, proper temperature, and
moisture content as suitable for installation.

C. In exposed work, discard masonry with chips, cracks, voids, or
unusual discolorization.

## 3.02 [REINFORCEMENT INSTALLAION]{.underline}

A. Space horizontal joint reinforcement at 16 inches on center
vertically. Lap ends of sections 6 inches minimum.

B. Reinforce masonry openings greater than 1 foot in width with
horizontal reinforcement spaced above the lintel, below the sill, and a
second section of reinforcement spaced 8 inches above and below each of
those. Extend ends of reinforcement a minimum of 30 inches beyond the
edges of the opening.

C. Install concrete lintels or structural steel shapes with a minimum
bearing of 4 inches for openings 6 feet wide, and 8 inches for wider
openings, on each side of the opening.

## 3.03 [MASONRY INSTALLATION]{.underline}

A. Lay in full bed of mortar with ends thoroughly buttered. Compress
unit firmly into mortar and cut extruded excess mortar. As mortar
achieves its initial set, carefully compress and tool the face joints to
form a tight smooth concave joint. Rub firm joints with clean burlap or
other suitable material to remove fins and protrusions.

B. Lay in running bond pattern unless otherwise indicated.

C. Point and fill line nail holes after removal.

D. Space courses accurately with uniform mortar joints 3/8-inch thick.

E. Use flush wall joints for interior walls unless otherwise indicated.

F. Install whole, full-size masonry units wherever possible. Where part
units are required, cut accurately with a motor-driven masonry saw.

G. Provide vertical expansion, control, and isolation joints in masonry
where shown. Build in related masonry accessory items as the masonry
work progresses. Rake out mortar in preparation for application of
sealants.

## 3.04 [TOLERANCES]{.underline}

A. Variations in plumbness for vertical surface lines of columns and
walls: 1/4 inch in 10 feet maximum, or 3/8 inch in a story height, not
exceeding 20 feet.

B. Variations in levelness for lines of exposed lintels, sills,
horizontal grooves, and other conspicuous lines: 1/4 inch maximum in a
bay or 20-foot space; and 3/4 inch maximum in a wall regardless of wall
length.

## 3.05 [FIELD QUALITY CONTROL]{.underline}

A. Check completed walls that are to receive covering to ascertain units
are accurately placed and not damamged and that masonry joints are full
and accurately finished.

B. Repair or replace defects prior to application of covering.

## 3.06 [CLEANING AND ADJUSTING]{.underline}

A. Clean mortar joints of fins, gaps, runs, and excessive mortar.
Correct defects prior to the hard set of the mortar by rubbing,
troweling, or tooling.

B. Brush or scrape exposed masonry surfaces free of dirt, excess mortar,
and other foreign materials.

C. Remove mortar stains on exposed wall surfaces by cleaning with a 5
percent solution of muriatic acid followed by a thorough rinsing with
clean water. Alternate methods of cleaning may be submitted for
approval.

D. Scrub exterior and exposed interior masonry with clean water, using a
stiff brush followed by a bath of clean water.

E. Start final cleaning at the top of walls and proceed downward.

## 3.07 [PROTECTION]{.underline}

A. Cover installed masonry construction with heavy waterproof sheeting
extending 24 inches down both sides and secure at the end of each day
and during periods or precipitation to prevent intrusion of water into
the cells and cavities.

B. Provide temporary bracing for walls and partitions subject to wind or
other lateral loads higher than ten times its thickness.

C. Do not apply uniform floor or roof loading for at least 12 hours or
concentrated loads for at least 3 days after building masonry walls or
columns.

D. Prevent grout or mortar from staining the face of masonry to be left
exposed.

E. Protect sills, ledges, and projections from mortar droppings.

END OF SECTION