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SOC > SOC Masonry > Flashcards

SOC Masonry Flashcards

1
Q
  1. How should you take care of your tool while doing masonry work?
A

Wet tools before use
Rinse all tools with water frequently
Do not immerse dirty tools in water. The cement will cure underwater

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2
Q
  1. What are the dimension (nominal and actual) of a CMU/Cinder block?
A

Nominal 8 x 8 x 16 inches
Actual 7 5/8 x 7 5/8 x 15 5/8 inches
• 3/8 inch for mortar joint

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3
Q
  1. What are the size of a masonry joints?
A

3/8

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4
Q
  1. What is the weight range of a CMU block?
A

35-45 LBS

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5
Q
  1. What is the weight range of a cinder block?
A

25-35 LBS

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6
Q
  1. What is the difference between a cinder block and a CMU block?
A

CMU blocks are used for load bearing walls while cinder block are used for non-load bearing walls

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7
Q
  1. What are the two concrete block used in class?
A

Stretcher and corner

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8
Q
  1. What are the different factors affecting bond strength to take into account in the choice of a mortar?
A 
TYPE (M,S,N, AND O)
Quality
Workability
Water retention
Surface texture
Quality of laying the blocks
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9
Q
  1. What are the desirable properties of a mortar?
A

Plasticity
Water retention
Strength and Durability

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10
Q
  1. Mortar is produced using what?
A

Masonry cement
Portland cement
* when Portland cement is used, masonry lime must use

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11
Q
  1. What are the different types of mortar?
A

M - 2500 psi, Below grade; load bearing, chimneys/manholes
S - 1800 psi, below grade, foundation walls sewers
N - 750 psi, general purpose above grade; interior or exterior, load bearing (normal)
O - 350 psi, used for non-load-bearing (pointing)

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12
Q
  1. What are the two types of mixing?
A

Machine mixing

Hand mixing

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13
Q
  1. What is the procedure for machine mixing?
A 
First, add most of the water and half the
sand
Next, add the masonry cement and the
rest of the sand
Mix continuously for one minute
Slowly add the rest of the water until
proper consistency is achieved

Should be used whenever possible
Mixing time 3 mins (may be extended to 5)

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14
Q
  1. How do we want the sand to be?
A

Damp and loose

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15
Q
  1. What are the two categories of sand?
A

Manufactured and Natural

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16
Q
  1. What is special requirement for water?
A

Same as concrete; Must be free of large amount of dissolved salt

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17
Q
  1. What is used for Accelerators?
A

Calcium Chloride (not more than 2 percent by weight, do not use for steel reinforced masonry)

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18
Q
  1. What is Re-termpering mortar?
A

Workability of mortar can be restored by adding water to stiffened mortar

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19
Q
  1. How should mortar material be stored?
A

All mortar material except sand and line in a dry place. Sand and lime should be covered to prevent moisture loss.

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20
Q
  1. What is wall consist of?
A 
Corner/end
Field
Control / expansion joints
Wall intersections
Rough opening (door and windows)
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21
Q
  1. What is first course?
A
  1. Locate the corners
  2. Lay mortar bed
  3. Lay block on all corners first
  4. Insure all blocks are leveled and plumb
  5. Insure all mortar joints are filled and tooled

Laying block between corners (Line block+mason twine)
Closure block
Reinforce
Control joints

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22
Q
  1. What size of a gap should you leave for the closure block?
A

Minimum 16 1/2 inch space (butter both ends)

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23
Q
  1. What type of wood should you use when in contact with masonry?
A

Pressure treated Isolate with moisture barrier to prevent moisture loss

24
Q
  1. Should you interlock course between load bearing and non-bearing walls?
A

No

25
Q
  1. What are the two types of lintel?
A

Constructed

Precast

26
Q
  1. What are two type of finishing action?
A

Tooling/Striking

Patching

27
Q
  1. How should you be striking?
A

Vertical then horizontal

28
Q
  1. What are Load bearing walls
A

Load bearing walls are crucial to hold up building, where non-load bearing wall is secondary support joint.

29
Q
  1. What is the rule of thumb for the placement of control joints?
A

No more than 25 feet between the joints

No thicker than 1/2 inch

30
Q
  1. What are the two types of finishing joints?
A

Concave joint

V-joint

31
Q
  1. How many bricks make a pallet?
A

525 Bricks

32
Q
  1. How many CMU blocks make a pallet?
A

94 CMU Block

33
Q
  1. Can you use calcium chloride when working with steel reinforced masonry?
A

No

34
Q
  1. When tying walls together what is the vertical distance between metal ties?
A

4 ft

35
Q
  1. Formula for estimating masonry block
A

Linear Feet x Height x 1.125 x Number of Structures =Total # of blocks

LF = 2 (L + W)

36
Q
  1. Formula estimating bags of masonry cement
A

(Number of Blocks) x 3 / 100 = Bags of Cement

37
Q
  1. Formula estimating for tons of masonry sand and water
A

1 ton of sand per 8 bags of masonry cement
-or-
Bags of cement ÷ 8 = tons of sand

8 x bags = gallons of water

38
Q
  1. How to find CMU for non-American standard concrete Block?
A

144 / ( H+3/8) X (L+3/8)

3/8 is width of masonry joint

39
Q

What does CMU stand for?

A

Concrete Masonry Unit

40
Q

What are the types of Masonry Units

A

Hollow - Load-bearing and Non-load bearing

Solid - Brick and Block

41
Q

Recipe for Mortar

A

Masonry Cement (or Portland with Lime)
Masonry Sand
Water

42
Q

Steps to hand mix mortar

A

Used to mix small amounts or when
machine is not available.
Use a leak proof mortar box or other
suitable container.
Place sand in first, and then place all other
materials on top.
Mix all dry material first before adding water.

43
Q

Laying the corners

A

Build up the corners 4 or 5 courses high.
Step each course back one-half block.
Mortar for horizontal joints is applied to the
top of the course previously laid.
Apply mortar for the vertical joints to either
the block being laid or to the block
previously laid.

44
Q

Laying blocks between corners

A

Stretch a mason’s line between corners on the
exterior edge of the wall.
Lay the outside top edge of each block to this
line.
Align each block to mason’s line by tapping with
a trowel handle.
Check level, Plumb, square, rack and make all adjustments to blocks while mortar is still soft and plastic.

45
Q

Types of reinforcement

A

Rebar

Latter (Wire)

46
Q

Anchor Bolts

A

Used to fasten timber or metal framing to
masonry foundation
Place metal lath in the second horizontal
mortar joint from the top of the wall under
the cores that will contain the bolts.
Place 1/2” x 18” bolts in cores, and space
them not more than 4 feet apart.
Fill cores containing bolts with concrete or
mortar.

47
Q

How far should anchor bolts be spaced?

A

Less than 4 feet apart

48
Q

Control Joint

A 
Sometimes called expansion joints
Breaks up the masonry work into panels
Joint is a continuous space where
masonry does not touch
Used to prevent extensive cracking from
one panel to another

Placement rule of thumb= No greater than
25’ between joints; No thicker than ½”

49
Q

What are the two ways to tie in load-bearing and non-load-bearing walls?

A

Metal ties

1/4 inch galvanized mesh

50
Q

Modular Coordination

A

When the design of a building, its components, and the building material units all conform to a dimensional
standard based on a modular system.

51
Q

Modular Measure

A

The system of dimensional standards for buildings and building components that permit field assembly without cutting.

52
Q

What does planning save?

A

Considerable:
Time
Labor
Materials

53
Q

Lintels

A

Lintels are used to support masonry block over modular openings such as doors and windows in walls.

54
Q

Sills

A

Sills are used to create a finished look for the bottoms of openings in walls. They are usually precast and installed following wall construction.

55
Q

When can you begin tooling/striking?

A

When mortar is “thumbprint hard”

56
Q

Formula estimating for water

A

8 gallons per 1 bag of masonry cement
-or-
Bags of cement x 8 = gallons of water

SOC (13 decks)

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