Module 1 Properties of concrete
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
