Concrete

Question 1

How many types of concrete are there?

Answer 1

5 types, 1-3 are for freeze/thaw resistance

Question 2

How much does a bag of Portland cement weigh?

Answer 2

94lbs, 1 barrel is 376lbs (or 4 bags)

Question 3

What is warehouse pack, and how should concrete bags be stored?

Answer 3

Warehouse pqck is when concrete at the bottom of a heavy stack has become stiff due to the weight

Concrete should be stored on elevated platforms, and protected from the elements

Question 4

What are the disadvantages of concrete?

Answer 4

• low tensile strength
• expands and contracts
• shrinks when dry
• heavy

Question 5

What is the 1-2-3 mix equation?

Answer 5

Pv= L’ xW’ xThickness” x # of structures/12
LF =PVx (>5400cuft= 1.05) (>5400 cuft=1.1)
LV= LF x 1.5
(LV x 1)/6= bags cement
(LV x 2)/6= cu ft sand
(LV x 3)/6= cu ft gravel
Water= 8 x # bags cements= gals Water

Question 6

For hand mixing concrete, how many cu yards can 1 person mix in 1 hour?

Answer 6

1 cu yrd

Question 7

Concrete forms must have these properties

Answer 7

Tight, ridged, and strong