Scoring

Pavement Surface Distress Index

Definition

Surface Distress Index (SDI / RT-SDI). A 0-100 score isolating surface-level deterioration — raveling, bleeding, weathering — and complementing structural scores like PCI.

In context

The Surface Distress Index separates 'the surface is wearing' from 'the structure is failing.'

← All glossary terms

Related Terms in Scoring

Browse the full glossary →
Scoring

SDI

Surface Distress Index (RT-SDI). A 0-100 score built on the FHWA Surface Distress Index methodology with weighted catego…
Scoring

PCI

Pavement Condition Index (RT-PCI). A 0-100 composite score built on ASTM D6433. All 19 distress types identified per E17…
Distress

Raveling

The wearing away of the pavement surface caused by dislodging of aggregate particles and loss of asphalt binder. Also ca…
Distress

Bleeding

A film of bituminous material on the pavement surface that creates a shiny, glass-like, reflecting surface. Usually caus…
Distress

Weathering

The wearing away of the pavement surface caused by loss of asphalt binder and dislodging of aggregate particles. Also ca…
Scoring

CCI

Cracking Condition Index (RT-CCI). A 0-100 score built primarily on ASTM E3303, computing aperture-weighted cracking ind…