API Audio Accessories 7-22-10 Specifications Page 23

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08/20/10 04220-1
SECTION 04220
CONCRETE UNIT MASONRY
PART 1 GENERAL
1.01 SECTION INCLUDES
A. Concrete masonry units.
B. Mortar.
C. Grout.
D. Reinforcement.
E. Lintels.
1.02 REFERENCES
A. ASTM A82-88 - Steel Wire, Plain, for Concrete Reinforcement.
B. ASTM C90-85 - Hollow Load-Bearing Concrete Masonry Units.
C. ASTM C387-87 - Packaged, Dry, Combined Materials for Mortar and Concrete.
D. ASTM C476-83 - Grout for Masonry.
E. ASTM C1019-89 - Sampling and Testing Grout.
1.03 RELATED SECTIONS
A. Section 03001 - Concrete.
PART 2 PRODUCTS
2.01 MATERIALS
A. Premix Mortar: ASTM C387, Type M or S.
B. Grout: ASTM C476. f'm > 2000 psi Slump between 8 and 11 inches.
C. Hollow Load Bearing Block Units: ASTM C90, Grade N, Type II, normal weight.
D. Joint Reinforcement: ASTM A82, welded construction. Two, nine gage wires running parallel to
each other.
E. Water: Potable. Clean and free of amounts of oils, acids, alkalies, salts, organic materials, or
other substances that may be deleterious to mortar or any metal in the wall.
2.02 LINTELS
A. Construct with reinforced concrete per Section 03001.
B. Provide minimum 2 - #5 reinforcing bars or equivalent in bottom with 2 inches cover.
C. If lintels are precast, designate top and bottom.
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