Concrete

Question 1

Weight of bag of Portland cement

Answer 1

94lbs

Question 2

Types of concrete

Answer 2

Reinforced
Prestressed
Precast
Lightweight

Question 3

Disadvantages of concrete

Answer 3

Low tensile strength
Expands and contracts
Shrinks when dry
Heavy

Question 4

How many cubic feet in a cubic yard

Answer 4

27

Question 5

1-2-3 mix formula

1) project volume

Answer 5

PV=L x W x thickness. Divide by 12 for each measurement in inches

Question 6

1-2-3 mix formula

2) loss factor

Answer 6

New total=PV x (LF)

LF= 1.1 if PV is less than 5400
= 1.05 if PV is more than 5400 or delivered by truck

Question 7

1-2-3 mix formula

3) loose volume

Answer 7

LV=LF x 1.5

Round up to whole number

Question 8

1-2-3 mix formula

4) cement, sand, gravel and water

Answer 8

Bags of Cement = LV/6
Cu ft sand = (LV x 2)/6
Cu ft gravel = (LV x 3)/6
Water = 8 x bags of cement

Question 9

Truck delivery tips

Answer 9

Always use 1.05 for LF

convert to cu yards

Question 10

How much concrete can one person mix per hour

Answer 10

1 cu yard

Question 11

Forms must be

Answer 11

Tight, rigid and strong