COSC Exam 3 with all Correct & 100% Verified Answers |
Latest Version |Already Graded A+
MasterFormat for Masonry ✔Correct Answer-Division 04
Portland cement-lime mortar ✔Correct Answer-Portland cement
aggregate (sand)
hydrated lime
water
is the "glue" that binds the sand particles together
aggregate ✔Correct Answer-can be:
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
provides the basic structural body of the hardened mortar
Hydrated lime ✔Correct Answer-made by burning limestone or seashells
added to improve smoothness and workability of the mortar in its plastic state
admixtures ✔Correct Answer-Added ingredients to improve performance or adjust properties
such as pigments, bond enhancers, accelerators and retarders
Type M mortar ✔Correct Answer-high strength, low workability mortar
recommended for walls subject to high lateral or compressive loads
Type S mortar ✔Correct Answer-higher flexural strength than type n
recommended for walls with high wind or seismic loads
Type O Mortar ✔Correct Answer-Low-strength mortar suitable for use in interior non-load
bearing walls
Type N mortar ✔Correct Answer-general purpose mortar with a good balance of capabilities
and good workability
Type K mortar ✔Correct Answer-A very low strength mortar used in historic preservation
work
Mortar Types ✔Correct Answer-ASTM C270
Soft mud process ✔Correct Answer-Relatively moist clay is pressed into individual molds by
hand or machine
, Water struck: molds are pre-wetted
Sand-struck: molds are pre-dusted with sand
dry-press process ✔Correct Answer-Clays are kept relatively dry and stiff and machine-
pressed into steel molds at high pressure
stiff mud process ✔Correct Answer-Moderately moist clay is extruded through dies and then
sliced into individual units
Accounts for approximately 90% of US-made bricks
The extrusion process naturally produces brick units with a smooth face and high dimensional
uniformity
Various post-extrusion distressing steps can be used to create bricks with greater variation in
shape and surface texture
Brick Firing ✔Correct Answer-Formed bricks are dried and then kiln-fired, where they pass
through stages of drying and chemical transformation. firing: 10 to 40 hours
laying brick ✔Correct Answer-Corner leads are constructed ahead of the rest of the wall
Leads establish the wall planes and course heights
Bricks between the leads are laid
Level and string lines are used to keep the wall straight and true
joint tooling ✔Correct Answer--Tooling compacts joint surface, making it durable and water-
resistant and neatening its appearance
concave and vee joints ✔Correct Answer-shed water most effectively and are the most
resistant freeze-thaw cycles
span openings ✔Correct Answer-Lintels
Steel angle
Reinforced concrete
Reinforced brick
steel reinforcing ✔Correct Answer-added to the masonry wall, to increase its strength,
especially in bending and shear
Low-lift grouting ✔Correct Answer-Wall is constructed no more than four feet in height
Vertical reinforcing is installed and left extended 30 bar diameters above the wall
Cavity is filled with grout
High-lift grouting ✔Correct Answer-Wall is a grouted a story at a time
Some bricks on lowest course are temporarily omitted to create cleanout holes
Cavity is flushed periodically to remove debris
Latest Version |Already Graded A+
MasterFormat for Masonry ✔Correct Answer-Division 04
Portland cement-lime mortar ✔Correct Answer-Portland cement
aggregate (sand)
hydrated lime
water
is the "glue" that binds the sand particles together
aggregate ✔Correct Answer-can be:
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
provides the basic structural body of the hardened mortar
Hydrated lime ✔Correct Answer-made by burning limestone or seashells
added to improve smoothness and workability of the mortar in its plastic state
admixtures ✔Correct Answer-Added ingredients to improve performance or adjust properties
such as pigments, bond enhancers, accelerators and retarders
Type M mortar ✔Correct Answer-high strength, low workability mortar
recommended for walls subject to high lateral or compressive loads
Type S mortar ✔Correct Answer-higher flexural strength than type n
recommended for walls with high wind or seismic loads
Type O Mortar ✔Correct Answer-Low-strength mortar suitable for use in interior non-load
bearing walls
Type N mortar ✔Correct Answer-general purpose mortar with a good balance of capabilities
and good workability
Type K mortar ✔Correct Answer-A very low strength mortar used in historic preservation
work
Mortar Types ✔Correct Answer-ASTM C270
Soft mud process ✔Correct Answer-Relatively moist clay is pressed into individual molds by
hand or machine
, Water struck: molds are pre-wetted
Sand-struck: molds are pre-dusted with sand
dry-press process ✔Correct Answer-Clays are kept relatively dry and stiff and machine-
pressed into steel molds at high pressure
stiff mud process ✔Correct Answer-Moderately moist clay is extruded through dies and then
sliced into individual units
Accounts for approximately 90% of US-made bricks
The extrusion process naturally produces brick units with a smooth face and high dimensional
uniformity
Various post-extrusion distressing steps can be used to create bricks with greater variation in
shape and surface texture
Brick Firing ✔Correct Answer-Formed bricks are dried and then kiln-fired, where they pass
through stages of drying and chemical transformation. firing: 10 to 40 hours
laying brick ✔Correct Answer-Corner leads are constructed ahead of the rest of the wall
Leads establish the wall planes and course heights
Bricks between the leads are laid
Level and string lines are used to keep the wall straight and true
joint tooling ✔Correct Answer--Tooling compacts joint surface, making it durable and water-
resistant and neatening its appearance
concave and vee joints ✔Correct Answer-shed water most effectively and are the most
resistant freeze-thaw cycles
span openings ✔Correct Answer-Lintels
Steel angle
Reinforced concrete
Reinforced brick
steel reinforcing ✔Correct Answer-added to the masonry wall, to increase its strength,
especially in bending and shear
Low-lift grouting ✔Correct Answer-Wall is constructed no more than four feet in height
Vertical reinforcing is installed and left extended 30 bar diameters above the wall
Cavity is filled with grout
High-lift grouting ✔Correct Answer-Wall is a grouted a story at a time
Some bricks on lowest course are temporarily omitted to create cleanout holes
Cavity is flushed periodically to remove debris
