04200-2
UNIT MASONRY
2.4 MORTAR AND GROUT MATERIALS
A. Portland cement: ASTM C150, Type I or Type II, gray color.
Masonry Cement: ASTM C91, Type S.
Mortar aggregate: ASTM C144, standard masonry type.
Grout aggregate: ASTM C476, Fine Grout.
Hydrated lime: ASTM C207, Type S.
Water: Clean and potable.
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2.5 MORTAR MIXES
A. Mortar shall be: ASTM C270, Type S with a minimum 28-day compressive strength
of 1800 PSI.
2.6 GROUT MIXES
A. Grout for bond beams, lintels and reinforced CMU cores shall have 2000 PSI
compressive strength at 28 days; mixed in accordance with ASTM C476 fine grout.
PART 3 - EXECUTION
3.1 MORTAR MIXING
A. Thoroughly mix mortar ingredients in quantities needed for immediate use in
accordance with ASTM C270:
1. Proportions by volume for Portland cement-lime-sand mixture:
a. 2 parts Portland cement
b. 1 part hydrated lime
c. 9 parts masonry sand
2. Properties by volume for masonry cement - sand mixture:
a. 2 parts masonry cement
b. 6 parts masonry sand
Do not use anti-freeze compounds to lower the freezing point of mortar.
If water is lost by evaporation, retemper only within two hours of mixing.
Use mortar within two hours after mixing at temperatures of 80 degrees F, or 2%
hours at temperatures under 50 degrees F.
E. Use care when mixing to provide a consistent mixture.
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3.2 GROUT MIXING
A. Thoroughly mix grout ingredients in quantities needed for immediate use in
accordance with ASTM C476:
1. Proportions by volume:
a. 1 part Portland cement
b. 1/10-part hydrated lime
c. 3 parts sand
B. Do not use anti-freeze compounds to lower freezing point of grout.
3.3. COURSING
A. Establish lines, levels, and coursing indicated. Protect from displacement.
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