Failures in rigid pavement

Types of Failures in Rigid Pavements Joint Spalling in Rigid Pavements. Excessive compressive stress causes deterioration in the joints,... Faulting in Rigid Pavements. The difference in elevation between the joints is called as faulting. Polished Aggregate in Rigid Pavements. The repeated traffic ...

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1. FAILURES IN RIGID PAVEMENT PESENTED BY GAYATHRY SATHEESAN TYPES OF FAILURES IN RIGID PAVEMENTS 1

2. FAILURES OF RIGID PAVEMENT Failure in rigid pavement (or cement concrete pavement) can be identified by formation of cracks on the pavement surface. The two prime factors responsible for rigid pavement failure are Use of poor quality material Inadequate stability of the pavement structure 2 TYPES OF FAILURES IN RIGID PAVEMENTS

3. Poor quality of material consist of following items Using soft aggregate Poor quality of sub-grade soil Poor joint filler R sealer materials 2. Inadequate stability of the pavement structure can be due to following reason Inadequate pavement thickness Lack of sub-grade support Improper compaction of sub-grade Improper spacing of joints 3 TYPES OF FAILURES IN RIGID PAVEMENTS

4. TYPES OF FAILURE IN RIGID PAVEMENT Scaling of cement concrete Shrinkage cracks Joint spalling Warping cracks Pumping 4 TYPES OF FAILURES IN RIGID PAVEMENTS

5. 1.  SCALING OF CEMENT CONCRETE It is the peeling off or flaking off of the top layer or skin of the concrete surface. This may be due to the following reasons Improper mix design Excessive vibration during compaction of concrete Laitance of concrete Performing finishing operation while bleed water is on surface 5 TYPES OF FAILURES IN RIGID PAVEMENTS

6. TYPES OF FAILURES IN RIGID PAVEMENTS 6 Fig;scaling of cement concrete Source;https ://i1.wp.com/ civilblog.org / wpcontent /uploads/2016/01/ Scaling.jpg

7. 2. SHRINKAGE CRACKS Formation of hairline shallow cracks on concrete slab is the indication of shrinkage cracks. Shrinkage cracks develop on concrete surface during the setting & curing operation. These cracks may form in longitudinal as well as in transverse direction. 7 TYPES OF FAILURES IN RIGID PAVEMENTS

8. TYPES OF FAILURES IN RIGID PAVEMENTS 8 Img;shrinkage images Source:https :/// civilblog.org / wpcontent / uploadshrinkage-cracking.jpg

9. 3. JOINT SPALLING It is the breakdown of the slab near edge of the joint . Normally it occurs within 0.5 m of the joints. The common reasons for this defect are Faulty alignment of incompressible material below concrete slab. Insufficient strength of concrete slab near joints. Freeze-thaw cycle. Excessive stress at joint due to wheel load. 9 TYPES OF FAILURES IN RIGID PAVEMENTS

10. TYPES OF FAILURES IN RIGID PAVEMENTS 10 Fig.: Joint Spalling in Rigid Pavement Slabs https://theconstructor.org/wpcontent/uploads/2017/03/joint-spalling-rigid-pavementa.jpg

11. TYPES OF FAILURES IN RIGID PAVEMENTS 11 Img ;joint spalling Source: https://theconstructor.org/wp-content/uploads/2017/03/failures-in-rigid-pavements.jpg

12. 4. WARPING CRACKS When joints are not designed properly against hot weather, it prevents expansion of concrete slab and therefore results in development of excessive stress. This stress cause formation of warping cracks of the concrete slab near the joint edge. This type of crack can be prevented by providing proper reinforcement at the longitudinal and transverse joints. Hinge joints are generally used to relieve the stress due to warping 12 TYPES OF FAILURES IN RIGID PAVEMENTS

13. TYPES OF FAILURES IN RIGID PAVEMENTS 13 Img : warping cracks Source: https://theconstructor.org/wp-content/uploads/2017/03/durability-cracking-failure-in-rigid-pavements.jpg

14. 5. PUMPING When material present below the road slab ejects out through the joints or cracks, it is called pumping. When soil slurry comes out it is called mud pumping. The common reasons for this defect are Infiltration of water through the joints, cracks or edge of the pavement forms soil slurry When there is void space between slab and the underlying base of sub-grade layer. Poor joint sealer allowing infiltration of water Repeated wheel loading causing erosion of underlying material 14 TYPES OF FAILURES IN RIGID PAVEMENTS

15. TYPES OF FAILURES IN RIGID PAVEMENTS 15 Img : pumbing failure Source:https :// theconstructor.uploadspumping-effect.jpg Img : pumbing failure Source:https :// civilblog.org / wp -content/ uploadsPumping.jpg

16. THANK YOU  16 TYPES OF FAILURES IN RIGID PAVEMENTS