Mortar correct answers Cushions masonry units, ensuring uniform bearing,
Seals joints between the units, minimizing the flow of air and water, Adheres units, providing
resistance to lateral forces
Portland cement correct answers bonding agent in mortar
Calcium silicates
Calcium from limestone, marble, and other minerals
Silica from clay, sand, shale, marl
Very fine particle size: 0.0004 to 0.0006 inches diameter
Aggregate correct answers Natural sand
Manufactured sand made from crushed stone, gravel, or furnace slag
A well-graded mix with particles ranging in size from 0.003 - 0.187 inches in diameter
Hydrated Lime correct answers Made by burning limestone or seashells
Added to improve smoothness and workability of mortar
calcium oxide correct answers quicklime
production of lime correct answers ASTM C207
Sand correct answers _____________ provides the basic structural body of the hardened mortar
Portland cement correct answers _____________ ___________ is the "glue" that binds the sand
particles together
Lime correct answers ___________ improves the workability of mortar in its plastic state
minimum correct answers A ______________ amount of water is necessary for the chemical
hydration of the cement
Water correct answers Additional _____________ is added to produce a good working
consistency to the wet mortar
retempered correct answers Stiff mortar may be _________________ if less than 90 minutes old
2 1/2 correct answers Stiff mortar more than _______ hours old must be discarded
, Bond Enhancers correct answers Improve flexural strength, freeze-thaw resistance
Set accelerators and retarders correct answers Adjust setting time in cold or hot weather
water repellants correct answers Improve water resistance
workability enhancers correct answers Ease placement of wet mortar
Type N mortar correct answers -General purpose mortar with good bonding capabilities and
workability
-Exterior masonry not subject to severe lateral loads
Type S Mortar correct answers -Higher flexural strength than type N (recommended for walls
with high wind or seismic loads)
-Reinforced loadbearing masonry
-Exterior veneer subjected to high wind forces or seismic forces
Type O Mortar correct answers -Low strength mortar recommended for interior non-loadbearing
walls
-Interior nonloadbearing masonry
-Historic masonry restoration
Type M Mortar correct answers -High strength mortar with less workability.
-Recommended for walls subject to high lateral or compressive loads
-Very high-strength masonry
-Masonry subject to severe freeze-thaw
-Masonry in contact with the earth
Type K mortar correct answers -Very low strength mortar used in historic preservation work
-Lowest strength
M,S,N,O,K correct answers MASON WORK
S and N correct answers Two most commonly specified mortars
proportioning ingredients or property specification correct answers Mortar types are defined
either by _______________ ____________ or _____________ ______________
proportion specification correct answers the simpler and more common method of defining
mortar requirements.
property specification correct answers most suitable to large projects, where the added cost and
complexity of laboratory testing can be offset by more flexibility in selecting ingredients and
proportions in the mix
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