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Maintenance, rehabilitation, reconstruction; evaluation methods

Describe briefly maintenance, rehabilitation and reconstruction. Describe the methods of pavement evaluation.

Maintenance, rehabilitation and reconstruction

TermMeaningExamplesAim
MaintenanceRegular works to keep the road in serviceable condition without improving the original designPatching, crack sealing, drain cleaning, resealing, regravellingPreserve the existing condition and slow deterioration
RehabilitationWorks that restore the structural strength and extend the life of an existing pavement, usually after major distressStructural overlay (by deflection/IRC:81), recycling, partial reconstruction of failed areas, wideningRaise the load capacity to carry the traffic of the next design period
ReconstructionComplete or near-complete removal and rebuilding of the pavement layers (and sometimes the geometry) at the end of its lifeRemoving all pavement layers and rebuilding to a new designProvide a new pavement with a full design life

Methods of pavement evaluation

Pavement evaluation is the systematic collection and analysis of data on the present condition of a pavement (surface and structure), so that the need for maintenance, strengthening or reconstruction can be decided and priorities set.

Functional evaluation (ride quality and safety)

  • Roughness - measured by bump integrator, MERLIN, Roadroid (smartphone) or profilometer, and expressed as the International Roughness Index (IRI, m/km); IRC:SP:16 gives evenness limits, and Nepal DoR uses roughness in its road maintenance management system.
  • Skid resistance - pendulum tester (British Pendulum Number), skid trailer.
  • Surface distress - visual condition survey of cracks, potholes, rutting, ravelling, bleeding and patching (IRC:82 and the Nepal DoR condition survey).

Structural evaluation (load capacity)

  • Deflection tests (non-destructive) - Benkelman beam (IRC:81), Falling Weight Deflectometer (FWD), Lacroix deflectograph.
  • Destructive tests - test pits and cores to find layer thickness, density and subgrade CBR; Dynamic Cone Penetrometer (DCP) for in-situ strength.
  • Other tests - Ground Penetrating Radar (layer thickness, non-destructive), plate load test on exposed layers, and back-calculation of layer moduli from FWD data.

Use: the results give a condition index, which is combined with traffic to select the treatment: routine maintenance, periodic maintenance, overlay (strengthening) or reconstruction.

✓ Answer checked by Claude Opus 5.5 (high effort)

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