Module 1 Properties of concrete

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How many numbers of cubic feet are there in one cubic yard of concrete?

27

How many days must newly placed conventional concrete be kept moist so that it will cure?

5-7 days

In the United States, portland cement is packaged in bags holding 1 cubic foot and weighing ________________.

94 lbs

Who developed prescriptive-type tables for use in project specifications?

American Concrete Institute

How is the strength of concrete in its hardened state is measured?

Compression test

Where are the dimensions needed to calculate the volume of concrete needed for a job found?

Construction drawings

When testing the concrete from paving mixers, the whole batch should be discharged and samples taken from ___________________.

Five locations

Structures can usually be divided into two or more ___________ to calculate concrete volume.

Geometric shapes

The dimensions of a structure are expressed in _____________ for concrete estimating purposes.

Linear feet

What formula do you use to calculate the volume of a circular column__________.

Pi x radius 2 x height

10 to 15 percent of the volume is ________ in a typical concrete mix.

Portland cement

What is a special type of concrete for use in high-temperature applications?

Refractory concrete

As concrete hardens, the heat of hydration continues, decreasing over a period of up to __________.

Several days

A pozzolanic material used in making very high-strength concrete is called ______________.

Silica Fume

A suitably strong aggregate material for use in high-strength concrete is ___________________.

Slag

The ____________ of concrete depends on the water-cement ratio.

Strength

Who provides information for concrete mix designs?

The engineer

The concrete discharge rate should be regulated by _____________________ for testing samples taken from truck mixers.

The rate of drum rotation

What type of cement is used when concrete forms must be removed as soon as possible?

Type III

The amount of concrete slump is measured to the nearest ___________________.

¼ inch


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