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North Carolina General Contractors Exam > Masonry > Flashcards

Masonry Flashcards

1
Q

The type of brick used in areas exposed to freezing but not wet conditions

A

MW

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2
Q

Unit of measure in a modular grid system is

A

4” x 2 2/3” x 8”

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3
Q

A stacked bond is

A

Vertical joints align

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4
Q

Considered the weakest bond

A

Stacked

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5
Q

White powder that appears after exposure to moisture in a masonry wall

A

Efflorescence

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6
Q

Recommended mortar joints in areas that are exposed to heavy rains and high winds

A

Concave

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7
Q

CMU with the least pounds per cubic foot of concrete

A

Expanded shale or pumice

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8
Q

Highest compressive strength aggregate in an 8x8x16 CMU

A

sand and gravel

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9
Q

When figuring nominal dimensions, what is the intended size of the mortar joint for concrete masonry units?

A

3/8”

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10
Q

An advantage of a two-core block design versus a three-core block design

A

Lighter, reduced heat conductor, and more space for conduit

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11
Q

To prevent moisture from entering the top of the masonry wall, use stone

A

Copings

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12
Q

Best stone to protect against moisture on sills

A

Limestone

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13
Q

Types of lime used in mortar

A

Type S hydrated

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14
Q

Type of mortar best suited for use below grade

A

M

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15
Q

To avoid hardening due to hydration, mortar should be used within what time span after mixing?

A

2 1/2 hours

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16
Q

Add to mortar for strength

A

cement

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17
Q

Most typically the significant property of hardened mortar

A

Bond strength

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18
Q

Type K mortar is used

A

Interior non-load-bearing partitions where high-strength is NOT necessary

19
Q

Type of mortar to be used for cavity walls when the wind speeds reach 80 MPH

A

Type S

20
Q

CF of mortar REQUIRED for a single wythe brick wall that is 200 square feet, has 3/8” joints and 655 non modular brick units per 100 square feet

A

11.6

21
Q

Gauge wire ordinarily used for continuous horizontal joint reinforcement

A

8, 9, 10, or 11

22
Q

Closest an adjustable truss type brick tie should be from the edge of the brick

A

5/8”

23
Q

Masonry walls that intersect may be connected by

A

Strap anchors

24
Q

Method of cutting brick most frequently used when the cut edge will be hidden by the mortar

A

brick hammer

25
Q

When laying a brick wall, the leads are

A

Corners

26
Q

Recommended sandblast pressure to use with 1/4” nozzle when sandblasting brick

A

60 - 120 lbs

27
Q

Best cleaning agent for brick

A

Hydrochloric or muriatic acid

28
Q

A ___ is a two-wythe wall allowing each wythe to react independently to stress

A

cavity wall

29
Q

Most common cavity size of a two wythe wall

A

2”

30
Q

When ties are used in composite walls, the requirement for #9 gauge ties is

A

one tie for every 2 2/3 SF

31
Q

Used to anchor masonry brick veneer to the structure

A

corrugated metal ties

32
Q

Type of concrete block most common for use with reinforcement

A

Two core blocks

33
Q

Of the following masonry ties, ____ is used to anchor masonry veneer to the structure

A

corrugated metal ties

34
Q

Blocks are positioned in a wall

A

Flange side up

35
Q

Distance from the string line to be maintained when laying block

A

1/16”

36
Q

Minimum cubic yards of cement for 6 cubic yards of sand

A

1 or 2

37
Q

Veneer wall approved for all except

A

Support loads

38
Q

According to Modern Masonry, a ____ is a structural member placed over an opening in a wall used to support the loads above that opening

A

lintel

39
Q

Welded wire fabric should be lapped

A

One full story + 2”

40
Q

What are the three types of mud:

A

Mortar, Grout, and Concrete

41
Q

Mortar has ____ hours

A

2.5 hours

42
Q

Grout has ___ hours

A

1.5 hours

43
Q

Concrete has ___ hours

A

1.5 hours or 300 revolutions

44
Q

Strongest to weakest mortar types

A

M A S O N W O R K
M = Strongest
S = Above grade
N
O
K = Weakest

North Carolina General Contractors Exam (15 decks)

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