Abstract
The paper examined the sensitivity of International Roughness Index (IRI) to the local discontinuities (various distresses, joints, joint and surface defects, other road features, etc.) of the cement concrete (CC) pavements. About 5 300 road records of total length 470 km from Long Term Pavement Performance (LTPP) program were processed. The raw profiles were separated into a random part and a distress part using the median filtering method. The median filter order was set to identify distresses of variable maximum width from 20 to 40 cm, and minimal height, 3 mm. About 26 000 distresses were separated and their dimensions were identified. The raw longitudinal road profiles were compared with the separated pure random parts. The mean relative increase in IRI caused by distresses was 3.3 % for maximum distress width 20 cm, 6.6 % (30 cm), and 10.7 % (40 cm).
Highlights
The cement concrete pavements present 0.6 % of the total length of road network in the Slovak Republic [1]
The typical part of CC pavement is a joint between slabs
This study is included in Long Term Pavement Performance (LTPP) Program governed by Federal Highway Administration
Summary
The cement concrete pavements present 0.6 % of the total length of road network in the Slovak Republic [1]. Miller and Bellinger [3] divided the distresses typical for pavements with jointed CC surfaces into four groups: (a) cracking (corner breaks, transverse cracking, etc.), (b) joints deficiencies (joint seal damage, spalling of joints, etc.), (c) surface defects (map cracking, polished aggregate), (d) miscellaneous distresses (faulting of transverse joints and cracks, patch/patch deterioration, water bleeding, etc.). Joint deteriorations such as spalling, breaking, cracking, chipping, or fraying of the slab edges usually occur within 50 mm of joints [4]
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