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Failures of rigid pavement

Short answer

Rigid pavement failures include transverse cracking (late sawing, thin slab), longitudinal cracking (differential settlement), corner breaks (unsupported corner), faulting (pumping), spalling (incompressibles in joints), blow-ups (blocked expansion joints), and scaling (poor curing). Water entry, poor load transfer, and heavy loads are common underlying causes.

What are the causes that result the failure of cement concrete pavement? Explain briefly.

Failures of cement concrete pavement and their causes

Typical types of failure of a cement concrete pavement, with their causes:

FailureDescriptionCause
Transverse crackingCracks across the slabLate sawing of joints, joint spacing too long, thin slab, restrained shrinkage
Longitudinal crackingCracks along the laneDifferential settlement, warping, thin slab, poor subgrade support
Corner break (corner crack)Triangular piece at the corner within 1.5 m of jointLoad at unsupported corner, loss of support (pumping), poor load transfer
Diagonal crackingCrack at about 45 degreesHeavy corner loads, settlement
Punch-out / shattered slabSlab breaks into many piecesHeavy repeated loads, weak sub-base
FaultingStep between slabs at a jointPumping, poor load transfer (dowel failure)
PumpingEjection of water and fines at jointsWater under slab, loose subgrade, heavy traffic
SpallingBreaking of joint edgesIncompressible material in joints, weak concrete, dowel misalignment
Blow-up (buckling)Slab lifts and shatters in hot weatherBlocked expansion joints, insufficient expansion gap
Scaling and crazingFlaking and map cracks on surfaceOver-finishing, poor curing, freeze-thaw
Joint seal failureSealant loss, weedsAged sealant, poor installation
 Faulting at a joint        Corner break
        ______              +-------------+
 ______|  step              |             |
     joint                  |             |
                            |   crack ->  /
                            +-----------/-+

Remedies include full-depth repair, slab replacement, dowel retrofit, grinding of faults, crack and joint resealing, undersealing (grout) to fill voids, and improving drainage.

General causes

  • Design: inadequate slab thickness, joint spacing too long, poor load transfer, insufficient sub-base.
  • Construction: poor compaction, honeycombing, late joint cutting, wrong dowel alignment, inadequate curing, poor quality concrete.
  • Traffic: overloading, repetitions beyond design.
  • Drainage and subgrade: water entering through joints causes pumping; soft subgrade settles.
  • Environment: temperature and moisture cycles (warping, blow-ups).

✓ Answer checked by Claude Opus 5.5 (high effort)

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