Practice Relative Stiffness Of Slab To Sub-grade (29.1.2) - Rigid pavement design

Practice: Relative stiffness of slab to sub-grade

Lesson 29.1.2Rigid pavement design

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8 questions

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Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
What is the radius of relative stiffness?
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Think of it as a measure of how stiff the slab is compared to what lies underneath it.
Question 2.
What role does the modulus of elasticity (E) play?
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Higher values typically indicate stiffer materials.
3Question 3.
What does the radius of relative stiffness help determine in pavement design?
- Thickness only
- Strength of sub-grade
- Performance of the slab
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Think about what helps sustain the slab during load applications.
4Question 4.
True or False: A higher modulus of elasticity indicates a less capable material.
- True
- False
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Consider how elasticity relates to strength.
Question 5.
Given a cement slab with a thickness of 25 cm, calculate the radius of relative stiffness if the modulus of elasticity is 3.5 x 10^5 kg/cm2, K is 3 kg/cm3, and µ is 0.2.
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Be careful with K and the Poisson’s ratio!
Question 6.
Critique the design of a slab with low stiffness and identify three possible design changes to improve its performance.
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Reflect on what changes typically strengthen structures.

4 more questions in this section. Enroll free to practise them all.