ASTM C 138 - DENSITY (UNIT WEIGHT) OF CONCRETE - CALCULATIONS

Question 1

Wfull/Wmeasure/Wconcrete/Vmeasure/lbs/ft^3

What is the formula for Density (Unit Weight) calculations?

Answer 1

UW = Wfull - Wmeasure

Vmeasure

=

Wconcrete

Vmeasure

=

__ lbs/ft³

Question 2

What do you need the weight of to get the yield calculations (yd³)

Answer 2

Weight of the batched materials

Question 3

__ ticket from the __ mix supplier?

Where can you find the weight of the batched materials?

Answer 3

Batch ticket from the ready mix supplier

Question 4

Yield(yd³) – How many ft³ = 1 yd³?

Answer 4

27.00 ft³

Question 5

What is the formula for Yield(yd³)?

Answer 5

Wbatch

UW x 27

=

yd³

Question 6

What is the definition of Relative Yield?

Answer 6

Ratio of the volume of concrete ACTUALLY PRODUCED vs. what was designed.

Question 7

What is the formula for Relative Yield?

Answer 7

R =

—————got————–

should have got

Question 8

Where is the information obtained for Theoretical Density calculation?

Answer 8

Batch weight for 1 yd³ of material

Question 9

What is the formula for theoretical density?

Answer 9

T =

Wmaterial

Vmaterial

Question 10

What is the formula for Air Content (Air%)?

Answer 10

Air%=

Theo. Density - Density

Theo. Density

x

100