CT 105 - Calcs

Question 1

CT 105 describes the procedures and calculations to illustrate methods of correcting for differences in dry density.

Answer 1

False, specific gravity

Question 2

It is necessary to waste the oversized portion of “as received” material in order to _______________.

Answer 2

Bring the grading into specification

Question 3

It is not permissible to increase a portion of the “as received” material in order to bring the grading into specification.

Answer 3

False

Question 4

Crushing oversize aggregate of an “as received” sample and recombining with uncrushed material may be needed to adjust gradings.

Answer 4

True

Question 5

When is grading analysis generally expressed as a percentage “by weight”?

Answer 5

When aggregates are of uniform specific gravity

Question 6

No adjustments to gradings should be made in the labratory that cannon made made in the _____________.

Answer 6

Field

Question 7

What ratio is used on the sieve to be scalped and all other sieves for adjusting?
Ex. 1” sieve has 90% passing but is scalped and removed.

Answer 7

100/% passing the sieve scalping is the ratio used and multiplied to that sieve and all the others to get the new adjustment. Ex. 100/90 * 90 = 100