Water used to mix concrete should be free of impurities.

Skin protection is necessary to prevent irritation.

To calculate volume, use length times width divided by depth.

Slump tests determine the uniformity of the concrete.

Water is used to produce cement.

Aggregate should be clean before mixing.

Concrete is harmless, so safety is not an issue.

Fuller's Rule is used to estimate the total raw materials needed.

A six-gallon mix means six gallons of water for every sack of cement.

Constructing a form requires specially treated lumber.

Scaling is identified by spider web type cracks in the concrete surface.

Concrete allowed to cure for seven days is only two-thirds as strong as concrete allowed to cure for 28 days.

Concrete is strongest if it is allowed to dry and cure fast.

Reinforcement increases the tension strength of concrete.

When staking a form using double-headed nails, you should nail from the inside of the form to the outside of the form.

Water tightness is related to the quality of the aggregate used in the concrete.

Concrete has 10 times less compressive strength than tension strength.

Workmanship is important in obtaining a durable concrete.

For complete hydration to occur, one sack of cement requires at least one gallon of water.

The main purpose of a wood trowel is to smooth a surface after pouring.

A mason's trowel is made of magnesium.

A power trowel is powered by hand.

A broom has an extendable handle to reach across large areas of concrete.

An edger provides a rounded profile to a concrete slab.

A jointer should always be used with a straight edge.

When producing an exposed aggregate finish, aggregate should be spread out over the concrete in a two stone layer.

A mason's trowel is used to pound aggregate into concrete.

A steel trowel produces a smoother finish than a magnesium trowel.

When producing a broomed finish, the broom should be dragged across the surface parallel to the direction of travel.

Concrete is strongest when it is allowed ample curing time.

Covering the concrete with aluminum helps the curing process.

Three kinds of ready-mix concrete trucks are transit mixer trucks and central mixer trucks.

According to the production, one advantage of using ready-mix concrete is the mixing is easy.

Air-entraining helps concrete resist freezing and thawing problems.

Water increasing agents reduce the amount of water required to make concrete workable.

Retarding agents speed up curing times.

Accelerating agents speed up curing times.

Pozzuolans minimize expansion and contraction during hot weather.

Buoyancy is determined by multiplying length, width and thickness.