Civil Engineering (CE) Exam  >  Civil Engineering (CE) Notes  >  Transportation Engineering  >  Failure of Rigid Pavement

Failure of Rigid Pavement | Transportation Engineering - Civil Engineering (CE) PDF Download

Failure 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
Poor quality of material consist of following items
Using soft aggregate
Poor quality of sub-grade soil
Poor joint filler R sealer materials
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.

Types of Failure in Rigid Pavement 
The following 5 form of failures are commonly found in rigid pavement
1.Scaling of cement concrete
2.Shrinkage cracks
3.Joint spalling
4.Warping cracks
5.Pumping

1. Scaling of cement concrete 
Scaling of rigid pavement simply means, 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

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.

3.Joint spalling 
Joint spalling 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

4. Warping cracks 
In hot weather, concrete slab tends to expand. Therefore the joints should be so designed to accommodate this expansion. When joints are not designed properly, 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.

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. Movement of heavy vehicles on pavement forces this soil slurry to come out causing mud pumping.
 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
Pumping can also lead to formation of cracks. This is because; ejection of sub-grade material below the slab causes loss of sub-grade support. When traffic movement occurs at these locations, it fails to resist the wheel load due to reduction of sub-grade support and develops cracks.

This type of defect can be identified when there is presence of base or sub-grade material on the pavement surface close to joints or cracks.
Failure of Rigid Pavement | Transportation Engineering - Civil Engineering (CE) 

The document Failure of Rigid Pavement | Transportation Engineering - Civil Engineering (CE) is a part of the Civil Engineering (CE) Course Transportation Engineering.
All you need of Civil Engineering (CE) at this link: Civil Engineering (CE)
26 videos|91 docs|58 tests

Up next

FAQs on Failure of Rigid Pavement - Transportation Engineering - Civil Engineering (CE)

1. What is a rigid pavement in civil engineering?
Ans. Rigid pavement refers to a type of road surface that is made of concrete or other rigid materials. It is commonly used in civil engineering for highways, airports, and heavy-duty industrial areas due to its durability and load-bearing capacity.
2. What are the common causes of failure in rigid pavement?
Ans. The failure of rigid pavement can be caused by several factors, including: - Insufficient design thickness, leading to structural failure under heavy loads - Poor construction practices, such as inadequate compaction or curing of the concrete - Environmental factors like freeze-thaw cycles, which can cause cracking and deterioration - Lack of proper maintenance, such as timely repairs and sealing of cracks - Overloading of the pavement beyond its design capacity, resulting in excessive stress and damage.
3. How can the failure of rigid pavement be identified?
Ans. The failure of rigid pavement can be identified through various signs and symptoms, including: - Cracking: This can be in the form of transverse, longitudinal, or random cracks on the surface of the pavement. - Spalling: It refers to the breaking of small pieces or chunks of concrete from the pavement surface. - Faulting: It occurs when there is a height difference between adjacent slabs, causing a rough ride and potential damage to vehicles. - Blow-ups: These are sudden upward displacements of the pavement due to the expansion of moisture trapped within the concrete. - Deterioration: This includes signs of erosion, potholes, and general wear and tear on the pavement surface.
4. How can the failure of rigid pavement be prevented?
Ans. To prevent the failure of rigid pavement, several measures can be taken, including: - Proper design: Ensuring that the pavement is designed with adequate thickness and reinforcement to withstand expected loads. - Quality construction: Following best practices during construction, such as proper compaction, curing, and joint sealing. - Regular maintenance: Conducting routine inspections and repairs to address any signs of damage or distress promptly. - Load restrictions: Implementing weight restrictions or enforcing traffic regulations to prevent overloading of the pavement. - Climate considerations: Accounting for local climate conditions and using appropriate materials and construction techniques to minimize the impact of freeze-thaw cycles or extreme temperatures.
5. What are the advantages of using rigid pavement in civil engineering projects?
Ans. Rigid pavement offers several advantages in civil engineering projects, including: - High durability: Concrete is a strong and long-lasting material, capable of withstanding heavy traffic loads and environmental conditions. - Smooth ride quality: Rigid pavement provides a smoother surface for vehicles, resulting in improved ride comfort and reduced wear and tear on vehicles. - Low maintenance: Compared to other types of pavement, rigid pavement generally requires less maintenance and repairs over its lifespan. - Reflective properties: The light-colored surface of concrete provides good visibility for drivers, especially during nighttime. - Resistance to fuel spills: Concrete is less susceptible to damage from fuel or oil spills, making it suitable for areas with high vehicle traffic.
26 videos|91 docs|58 tests
Download as PDF

Up next

Explore Courses for Civil Engineering (CE) exam
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev
Related Searches

practice quizzes

,

mock tests for examination

,

Sample Paper

,

Summary

,

Failure of Rigid Pavement | Transportation Engineering - Civil Engineering (CE)

,

Previous Year Questions with Solutions

,

Failure of Rigid Pavement | Transportation Engineering - Civil Engineering (CE)

,

Semester Notes

,

video lectures

,

study material

,

Exam

,

Objective type Questions

,

past year papers

,

Viva Questions

,

pdf

,

Free

,

Important questions

,

ppt

,

Extra Questions

,

MCQs

,

shortcuts and tricks

,

Failure of Rigid Pavement | Transportation Engineering - Civil Engineering (CE)

;