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Lecture 14 - The Pennsylvania State University Department...

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The Pennsylvania State University Department of Civil and Environmental Engineering Lecture 14 – Rigid Pavement Design CE 321: Highway Engineering Fall 2007
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Design Principles Rigid pavements distribute wheel loads by beam action of PCC slab. Material has high elasticity modulus Beam action distributes wheel loads over large area of pavement. Reduces high stresses to subgrade soil.
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Beam Action of Pavement
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AASHTO Design Procedure Based on AASHO Road Test results. Reduction in serviceability. Applicable to following: Jointed plain (no steel reinforcement). Reinforced (welded wire fabric). Continuously reinforced (steel bars both longitudinal and transverse). PCC slab thickness is measure of pavement strength.
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AASHTO Rigid Pavement Design Equation [ ] { } - - + + + + + + = 25 . 0 75 . 0 75 . 0 d c 10 8.46 7 10 10 o R 18 10 ) / /( 42 . 18 63 . 215 ] 132 . 1 [ C ' S log 0.32TSI) - (4.22 ] 1) /(D 10 X [1.624 1 PSI/(3.0)] [ log 0.06 - 1)] (D 7.35[log S Z W log k E D J D c W 18 = 18k equivalent single axle load Z R = reliability D =
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