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Flashcards in Masonry Deck (53)
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1

formula for estimating masonry block

linear feet x height x 1.125 =Total # of blocks

2

formula estimating masonry cement...

(number of blocks ÷ 100) x 3 = bags of cement

3

formula estimating for masonry sand

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

4

formula estimating for water

8 gallons of water per bag of cement
-or-
bags of cement x8 =gallons of water

5

how many CMU blocks come on a pallet?

94

6

formula for concrete Project Volume

PV= L ×W ×H × #of pads

7

formula calculating concrete Loss Factor

LF = PV x 1.1 (if under 5400 cubic ft/200cu yd)

LF = PV x1.05 (if over 5400cu ft/200cu yd

8

formula calculating concrete Loss Volume?

LV= LF x1.5

9

what are the most common types of mortar mixes?

N M S O

10

formula calculating cement, sand, and gravel for concrete

1/6 x LV =bags of cement
2/6 x LV = cubic feet of sand
3/6 x LV = cubic feet of gravel

11

How much concrete can delivery trucks hold?

10 cubic yards

12

formula converting cubic feet into cubic yards

(length x width x height) ÷ 27 = cubic yards

13

how much time do you have to pour concrete, once water is mixed in?

3 hours

14

What are the benefits of a lower psi mortar?

better adhesive and sealing powers

15

What is the most common cement used by the military?

Portland Cement

16

what type of mortar is general purpose?

Type N

17

What is Type N mortar used for?

above grade work, interior and exterior load bearing

18

What type of mortar has the highest compressive strength and is used for below grade load bearing?

Type M

19

What is Type S mortar used for?

below grade, sewers, brick patio/driveway

20

What type of mortar is used for above grade, non-load bearing situations?

Type O

21

What type of mortar is used for historic preservation?

Type K

22

Formula for Volume of a cylinder

V= pi x Radius squared x height

23

When hand mixing what order should you mix?

dry goods mixed, then add water

24

What components go into concrete?

Portland cement, water, aggregates

25

what affect does water have in mixing concrete?

less water makes a stronger mix

26

Concrete should be mixed with 60-80% of what?

Aggregates

27

What is used primarily to gain economy, in concrete mixtures?

Aggregates

28

what are the types of Aggregates in a concrete mix?

Course- gravel, rock
Fine- sand

29

What are the types of Portland Cement?

Type 1 Normal,
Type 2 modified,
Type 3 high early,
Type 4 low heat
Type 5 sulfate resistant

30

what types of Portland Cement are "air entrained"?

Types 1,2,3

31

What are the types of concrete?

Reinforced, pre-stressed, Precast, lightweight

32

Which type of concrete is easier to ship and fire resistant?

lightweight

33

Describe pre-stressed concrete

reinforced rebar or welded wires are stretched with tension before concrete is poured over it

34

what type of concrete has steel rods running through it?

Reinforced

35

What are the disadvantages of concrete?

Weak tinsel strength, expansion and contraction, shrinks while drying, weight

36

what advantages does concrete have over other materials?

durability, castable, economical, compressive strength

37

What type of joint controls cracking?

control joint

38

where would an expansion joint be located? What would it consist of?

between two slabs of concrete, such as sidewalk and building, or driveway and sidewalk.

a resilient material, rubber, wood etc no more than 1/4in thick

39

what must concrete forms be?

tight rigid strong

40

what must be <4ft per hour, vertically?

rate of filling concrete

41

When should you never pour concrete?

freezing Temps

42

when should you use accelerators?

When pouring in Temps over 90 degrees

43

when should you not use accelerators? why?

in reinforced concrete. they are oxidize and will weaken the metal

44

What is it called when you add more water to concrete mix?

retempering

45

what is Modular Construction?

when the dimensions of the construction are made around the size of block being used

46

Name the parts of a wall

corner/end, field, expansion/control Joint, intersection

47

what do you put in a block wall, every 4ft?

rebar reinforcement

48

What are the 3 essential things the foundation must be?

plumb, level, square

49

what does plumb mean?

perpendicular, straight up and down, on 2 axis'

50

what does it mean to be even on a horizontal plane?

level

51

what does square mean?

equal distances and angles

52

what are some considerations of a job site?

drainage, slope, soil stability, tactical employment, commanders desire

53

what size should footing be?

2x wall thickness