29.1.2 - Relative stiffness of slab to sub-grade
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Practice Questions
Test your understanding with targeted questions
What is the radius of relative stiffness?
💡 Hint: Think of it as a measure of how stiff the slab is compared to what lies underneath it.
What role does the modulus of elasticity (E) play?
💡 Hint: Higher values typically indicate stiffer materials.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What does the radius of relative stiffness help determine in pavement design?
💡 Hint: Think about what helps sustain the slab during load applications.
True or False: A higher modulus of elasticity indicates a less capable material.
💡 Hint: Consider how elasticity relates to strength.
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Challenge Problems
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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.
💡 Hint: Be careful with K and the Poisson’s ratio!
Critique the design of a slab with low stiffness and identify three possible design changes to improve its performance.
💡 Hint: Reflect on what changes typically strengthen structures.
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