Modern Masonry Flashcards
In masonry work, what tool is used to make long horizontal joints?
Sled runner jointer
Five strecher courses of brick with one header course describes which of the following types of bonds?
Common
What type of brick is used in areas exposed to freezing, but not wet conditions?
MW
With masonry, what unit of measure is used in a modular grid system?
4” inches
What is the nominal size of a modular brick?
4” X 2 2/3” X 8”
Whan laying brick and all the vertical joints align, this is a:
Stacked bond
The nominal size of an 8 inch stretcher block is:
8 X 8 X 16
Which of the following is not a masonry mortar?
P
What is the white powder that forms in a masonry wall after exposure to moisture?
Efflorescence
What type of mortar joint is recommended in areas exposed to heavy rain and high winds?
V-shaped or Concave
Which CMU has the least pounds per cubic foot of concrete?
Pumice
What is the highest strength aggregate in an 8 X 8 X 16 CMU?
Sand and gravel
When figuring nominal dimensions, what is the intended size of the mortar joint for concrete masonry units?
3/8”
What is the advantage of a two core block CMU versus a three core block design?
Lighter, reduced heat conductor and more space for conduit
To prevent moisture from entering the top of a masonry wall, you should use:
Copings
What is the best stone to protect against moisture on sills?
Limestone
Wall ties in a brick masonry cavity wall should be placed what distance from either edge of the masonry unit?
5/8”
What type of lime is used in mortar?
Type S hydrated
What type of mortar is best suited for use below grade?
Type M
To avoid hardening due to hydration, mortar should be used within what time span after mixing?
2 1/2 hours
What type of mortar is used for interior non-load bearing partitions where high strength is not needed?
Type K
What is added to mortar for compressive strength?
Cement
Welded wire mesh for masonry should be lapped to what minimum distance?
One full wire grid spacing plus 2 inches
Typically, what is the most significant property of hardened mortar?
Bond strength
Where wind speeds can reach speeds of 80 mph, what type of mortar is used in a cavity wall?
Type S
With masonry, what gauge wire is ordinarily used for continuous horizontal joint reinforcement?
8, #9, #10, & #11
What is the closest an adjustable truss type brick tie should be from the edge of the brick?
5/8”
What tool is used to cut brick when the cut edge will be hidden by the mortar?
Brick hammer
Which masonry joint provides the best moisture protection?
Tooled (Concave or V Joint)
When laying brick, the leads are:
The corners
What is the recommended air pressure setting when sandblasting brick with a 1/4” nozzle?
60 - 120 lbs
What is the best cleaning agent for brick?
Hydrochloric or muriatic acid
What is a two-wythe wall allowing each wythe to react independently to stress known as?
A cavity wall
What is the most common cavity size of a two-wythe wall?
2”
Foundation walls that are being damp-proofed should be parged how many inches above the finish grade?
6”
What is used to anchor masonry brick veneer to the structure?
Corrugated metal ties
Blocks are positioned in a wall:
Wide flange up
What are masonry exterior non-load bearing walls that are not wholly supported at each story?
Curtain walls
The maximum height of grout lifts is usually:
5’
Concrete pours of how high can be consolidated by rodding or vibration?
12”
What diameter bar is used to make a 3/8” concave mortar joint?
5/8”
Per 100 sq ft, using a 3/8’ mortar joint, you will need how many brick and how many cubic feet of mortar?
655 brick and 5.8 cubic feet of mortar
How long must the outer wythe of a cavity wall be on each side of an external corner before expansion joints are recommended?
50’ or more in length
Brick that will come into contact with ground water and freezing conditions should be type:
SW
What percentage of a brick must be solid for it to be considered solid?
75%
What type of facing tile is used when a high degree of mechanical perfection is required?
FTX unglazed
What is the weight of an 8 x 8 x 16 Concrete Masonry Unit (CMU) made of sand and gravel?
40 lbs
A standard glass block mortar joint is how thick?
1/4”
What is mortar mainly composed of?
Portland cement
What is the primary aggregate used in mortar?
Sand
How many cubic feet of mortar are required for a single wythe brick wall that measures 200 sq feet, has 3/8” mortar joints and has 655 non-modular brick units per 100 square feet?
11.6 cubic feet
Masonry walls that intersect may be connected by what means?
Strap anchor
When sandblasting, what size nozzle should be used?
1/4”
When using 9 gage ties in a composite wall, what is the proper separation of ties?
One for every 2 2/3 square feet
When laying block, what distance should be maintained from the mason’s line?
1/16”
When laying an 8”concrete block wall, a trowel is used to:
Spread and furrow a full mortar bed
The lead corner is usually laid up how many courses high?
Four or five
A masonry veneer will not:
Support loads
What masonry structural member is placed over an opening in a wall used to support the loads above that opening?
Lintel
How thick are terrazzo toppings typically?
1/2”
What type of footings are used for free standing columns or piers?
Isolated
Which brick pattern is considered the weakest bond?
Stacked bond
What type of CMU is commonly used with reinforcement?
Two-core
For Portland cement mixtures, what are the minimum cubic yards of cement required for 6 cubic yards of sand?
One cubic yard
This type of joint is made in masonry by raking out the mortar ¾” and sealing with a caulking compound.
Control joint
If a jack arch is over ___ feet wide, it should be supported by steel.
Two
What is filling voids in masonry with fresh mortar known as?
Tuck Pointing
