Unit 6: Concrete (True-False)

True

Concrete containing rebar is known as reinforced concrete.

True

Concrete gardens because of chemical reaction called hydration that occurs between the water and cement in a concrete mixture.

True

Concrete has more compressive strength than lateral strength.

True

Concrete should normally be discharged from a concrete truck within 1 1/2 hr after water has been added to the mixture.

True

Fiber-reinforced concrete (FRC) is concrete reinforced with plastic or steel fibers, which minimize cracking and increase tensile strength.

True

Floor slabs are more difficult to cure than walls.

True

Forms for concrete walls should remain in place for three to seven days to allow sufficient time for curing.

True

Print specifications may give the types of admixtures for concrete.

False

Proportions of cement, aggregate, and water for concrete are consistent, regardless of the mix required.

True

Rebar is a deformed steel bar with ridges on the surface to allow the bars to interlock with concrete.

True

Rebar size and placement are shown on the plot plan.

True

Sand is the fine aggregate used in concrete mixtures.

False

The printreading abbreviation for face brick is FCB.

False

The process of manufacturing cement was developed by Joseph Portland.

False

Water with a pH of 6 to 8 is suitable for a concrete mixture. It's got to be close to 11.

True

When pouring foundation walls, concrete should be poured in lifts of 12" to 20".