Lecture 4. PAVEMENT CONDITION SURVEYS. Instructional Objectives. Need for condition surveys Collection methodologies Four basic types of condition surveys Different procedures and equipment available. Need for Condition Surveys. Evaluate current condition of pavement
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PAVEMENT CONDITION SURVEYS
Uses visual inspection techniques
Patches and potholes
Patching and potholes
Longitudinal and transverse cracking
Patching and utility cuts
Blow-ups and Buckling
IRI is calculated from longitudinal profile measured with a road profiler in both wheelpaths. The average IRI of the two wheelpaths is reported as the roughness of the pavement section.
International Roughness Index (IRI) - The IRI is computed from a single longitudinal profile using a quarter-car simulation as described in the report, "On the Calculation of IRI from Longitudinal Road Profile." [Sayers 95]