Check your understanding of Lesson 1 by completing the practice exercise. There is only one correct answer to
each question. Try to answer all of the questions without referring to the lesson materials.
When you have completed all of the questions, turn the page and check your answers against the correct response.
Each correct response is referenced to specific portions of the lesson material so you can review any questions
you have missed or do not understand before continuing to the next lesson.
What percent (in volume) of inert filler material is used in normal concrete?
60 to 70
60 to 75
60 to 80
60 to 85
When air is chemically induced into the mix, what is the air called?
Which one of the following is not a limitation of concrete?
Low tensile strength
Water has two functions in concrete mix, to effect hydration and to improve workability.
When would a slump test not be used?
When portland cement is used
When the concrete contains admixtures
When the concrete contains aggregate much larger than 2 inches in size
When the concrete contains aggregates much smaller than 2 inches in size
After completing the slump test, tap the sides of the specimen gently to check its cohesiveness,
workability, and placability.