Masonry

Question 1

How should you take care of your tool while doing masonry work?

Answer 1

1. Wet tools before use

2. Rinse all tools with water frequently

Question 2

What are the dimension (nominal and actual) of a CMU/Cinder block?

Answer 2

8816 (7 5/87 5/815 5/8)

Question 3

What are the size of a masonry joints?

Answer 3

3/8

Question 4

What is the weight range of a CMU block?

Answer 4

35-45 LBS

Question 5

What is the weight range of a cinder block?

Answer 5

25-35 LBS

Question 6

What is the difference between a cinder block and a CMU block?

Answer 6

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

Question 7

What are the different factors affecting bond strength to take into account in the choice of a mortar?

Answer 7

Type
Quality
Workability
Water retention

Question 8

What are the desirable properties of a mortar?

Answer 8

Plasticity
Water retention
Strength
Duarbility

Question 9

What are the two different kind of cement used?

Answer 9

Masonry

Portland

Question 10

What are the different types of mortar?

Answer 10

M Below grade; contact with Earth 2500 psi
S High resistance to lateral forces 1800 psi
O Above grade non-load bearing 350 psi
N Above grade; high or lateral strength not required 750 psi
K Solely for historic preservation 75 psi

Question 11

What are the two types of mixing?

Answer 11

Machine

Hand

Question 12

What is the mixing time for a machine?

Answer 12

3 MIN; 1ST MIN dry

Question 13

How do we want the sand to be and what are the two categories of sand?

Answer 13

Damp and loose

Manufactured and Natural

Question 14

What are the steps of first course?

Answer 14

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
6. Laying block between corners (Line block+mason twine)
7. Closure block
8. Reinforce
9. Control joints

Question 15

What size of a gap should you leave for the closure block?

Answer 15

Leave a 16 1/2 space

Question 16

What type of wood should you use when in contact with masonry?

Answer 16

Pressure treated

Isolate with moisture barrier to prevent moisture loss

Question 17

Should you interlock course between load bearing and non-bearing walls?

Answer 17

No

Question 18

What are the two types of lintel?

Answer 18

Constructed

Precast

Question 19

What are two type of finishing action?

Answer 19

Tooling/Striking

Patching

Question 20

How should you be striking?

Answer 20

Vertical then horizontal

Question 21

What is the rule of thumb for the placement of control joints?

Answer 21

No more than 25 feet between the joints

No thicker than 1/2 inch

Question 22

What are the two types of finishing joints?

Answer 22

Concave joint

V-joint

Question 23

How many bricks make a pallet?

Answer 23

525 Bricks

Question 24

How many CMU blocks make a pallet?

Answer 24

94 CMU Block

Question 25

What is the difference between hydrated lime and lime putty?

Answer 25

Lime putty is wet hydrate lime (you add some water to it and stir it up)

Question 26

What are the two types of lime hydrate?

Answer 26

Type S (Special) - Dolomitic limestone 33-50% Mg carbonate
Type N (Normal) - High calcium limestone less than 5% Mg carbonate

Question 27

What type of lime hydrate is the one normally used?

Answer 27

Type S lime hydrate

Question 28

What are the typical hollow block size?

Answer 28

4’’, 6’’, 8’’, 10’’ and 12’’

Question 29

Can you use calcium chloride when working with steel reinforced masonry?

Answer 29

No

Question 30

What should be the distance between anchor bolt?

Answer 30

4 ft

Question 31

When tie walls together what is thew distance between metal ties?

Answer 31

4 ft vertically

Question 32

What is the purpose of tooling?

Answer 32

Watertight and looks good