Rigid Pavement Design: Stresses and Joint Types
Stresses due to temperature variation can affect concrete slabs, causing warping and friction stresses. Proper joint design, including expansion, contraction, and construction joints, is crucial to minimize stress and prevent warping in concrete pavements. This guide explores different types of joints used to address temperature-related stresses in rigid pavement design.
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Rigid Pavement Design Part 3
Stresses due to variation of temperature Stresses due to variation of temperature Concrete Concrete slabs slabs effected effected by by temperature temperature where where they they expanded expanded or or contraction contraction due due to to rise rise or or low low its its temperature temperature. . Due Due to to this this warping warping occur occur in in slab slab. . There There are are two two types types of of stresses stresses occur occur in in concrete concrete slab slab due due to to variation variation of of temperature temperature: : - - Warping Warping stress stress. . - - Friction Friction stress stress. .
To joints To reduce joints must reduce stress must be stress due be made due to made: : to variation variation of of temperature temperature the the following following Expansion . Contraction Warping : Construction : Longitudinal : Joint Joint Joint Construction Joint Longitudinal Joint Expansion Joint : Joint Joint Contraction Joint : Warping Joint . . . .
1 1.Transverse Joints Divided to expansion joint Warping Joint 2 2. . Longitudinal joints Location of these joint shown in Fig.( .Transverse Joints: Divided to expansion joint - - Contraction Joint Warping Joint - - Construction Joint. Longitudinal joints: Location of these joint shown in Fig.(11 Contraction Joint - - Construction Joint. 11): ): Fig.( Fig.(11 11) Locations of rigid joints. ) Locations of rigid joints.
Transverse Joints Expansion Contraction Transverse Joints Expansion Joints Contraction Joints Joints Joints 1 . 2 .
1. Expansion Joints 21 2 , 30 18 70 40 dowel 2.5 . 50 3 bars ) , 30 dowel bars ( , Fig.(12 Fig.( 12) ) Expansion Joint with dowel bar Expansion Joint with dowel bar
2 2. . Contraction Joints Contraction Joints ( 9 - 7.5 ) , . ( ( 4.5 ) 12 Caulking material h/2 to 2h/3 h a) Dummy Joint 1/4 to 1/3h h/2 6 mm h b) Contraction Joint with Dowel Bar c) Contraction Joint with Dowel Bar Felt and bitumen strip 1/4 to 1/3h h/2 h Smooth dowel bar Fig.( Fig.(13 13) Contraction Joint ) Contraction Joint
Longitudinal Joints 4.5 . Longitudinal Joints
