Bases and Subbases for Concrete Pavements Quiz
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Question 1 of 10
1. Question
1. In the early 1900’s what was the typical base/subbase thickness?
Hint
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Question 2 of 10
2. Question
2. Which is not a major cause of a non-uniform foundation?
Hint
The three major causes of a non-uniform foundation are:
- Pumping of the fine particles.
- Frost heave.
- Soil expansion.
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Question 3 of 10
3. Question
3. For rigid pavements, which is an example of an unstabilized base?
Hint
Unstabilized bases:
- Dense-graded aggregate base.
- Open-graded aggregate drainage layer.
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Question 4 of 10
4. Question
4. True or False. The use of stabilized bases under a concrete pavement can contribute to achieving a high level of smoothness for concrete pavements.
Hint
True
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Question 5 of 10
5. Question
5. Unstabilized bases, also frequently referred to as:
Hint
Unstabilized bases, also frequently referred to as granular bases, are the most commonly used base types for concrete pavements. Adequately designed and properly constructed, unstabilized bases exhibit excellent field performance at a lower cost than stabilized bases. A wide variety of materials can be used as unstabilized bases, including crushed stone, sand-gravels, sands, and a variety of waste and byproducts. The materials for unstabilized base should meet the requirements of AASHTO M 147.
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Question 6 of 10
6. Question
6. What type of material can be used as unstabilized bases
Hint
All of the above
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Question 7 of 10
7. Question
7. True or False. Recycled concrete material require less compaction than virgin aggregates.
Hint
- Once crushed, recycled concrete material becomes very angular and may require more compaction effort than virgin aggregates.
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Question 8 of 10
8. Question
8. To avoid cracking of the concrete panels, lean concrete bases should have compressive strengths between:
Hint
The strength of lean concrete base should be targeted to be between 750 and 1,200 psi. Lean concrete material meeting this requirement does not need joints. Shrinkage cracks will develop but will not reflect through the PCC slabs.
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Question 9 of 10
9. Question
9. Cement-treated bases typically contain _______ cement.
Hint
The material requirements for cement-stabilized bases do not need to be as strict as those for unstabilized bases. As for cement-treated bases, which typically contain 2 to 5 percent cement, the material requirements may be relaxed to allow up to 35 percent passing the No. 200 sieve and a plasticity index of 10.
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Question 10 of 10
10. Question
10. What is the relative cost for dense-graded asphalt base?
Hint
