Question

what is pigment? *
a. a chemical that speeds up concrete curing
b. a material added to concrete to change its color
c. a type of aggregate
d. a tool used for finishing concrete

what is the purpose of the silt test? *
a. to measure concrete strength
b. to check the soil that will be mixed with concrete
c. to dry out concrete
d. to color the concrete

how many cubic feet are in one cubic yard of concrete? *
a. 9 cubic feet
b. 12 cubic feet
c. 27 cubic feet
d. 100 cubic feet

Explanation:

1. For the pigment question: Pigments are colorants, so they are added to concrete to alter its color.
2. For the silt test question: The silt test assesses the quality of soil (fines content) that may be part of concrete aggregates.
3. For the volume conversion question: 1 yard = 3 feet, so cubic yard is $3 \times 3 \times 3$ cubic feet.

Answer:

1. B. A material added to concrete to change its color
2. B. To check the soil that will be mixed with concrete
3. C. 27 cubic feet