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8. Rigid pavement design
Rigid pavements are highly rigid structures made mainly of cement concrete, built primarily to provide maximum load carrying capacity through slab action. The design principles revolve around factors such as modulus of sub-grade reaction, critical load positions, and types of stresses including temperature and frictional stresses. Comprehensive joint design considerations for expansion and contraction joints, as well as dowel and tie bars, are necessary to ensure durability and functionality.
Sections
Rigid pavements are concrete slabs with limited flexural capacity under load, utilizing principles of elasticity and sub-grade reactions for design.
Rigid pavements are primarily made of cement concrete, offering high rigidity under loads.
The effective design of rigid pavements incorporates critical load positions and various stress types.
Joint designs, like expansion and contraction joints, are essential for accommodating temperature variations and preventing structural damage.
Modulus of Sub-grade Reaction
A measure of the sub-grade support provided to a slab, defining the relationship between pressure and deflection.
Critical Load Positions
Specific locations (interior, edge, corner) on a pavement slab where stress distributions are critically affected by vehicle loads.
Warping Stress
Stresses caused in the pavement due to temperature gradients resulting in slab deformation.
Frictional Stress
Stresses generated due to friction at the interface between the slab and the sub-grade.
Dowel Bars
Steel bars used to transfer loads between two concrete slabs and maintain their level.
Tie Bars
Bars used to keep two slabs tied together but do not transfer loads.
Practice Exercises
Total Questions
2
Estimated Time
4 min
Passing Score
70%
Instructions
- Read each question carefully
- You can use hints if you need help
- Complete all questions before submitting
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