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Title:

IRI Reduction of HMA Overlay on Concrete Base Slab in Urban Tunnel Expressway

Accession Number:

01550538

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

This research reveals new findings on smoothness improvement characteristics of hot mix asphalt (HMA) overlay on very rough surface that has not been previously investigated. Smoothness measurements were conducted in pavement in urban open-cut tunnel in the Marina Coastal Expressway (MCE) in Singapore. Overlay treatment applied is two HMA lifts of 4 cm-thick each. Two types of smoothness indices were adopted, the International Roughness Index (IRI) and Root Mean Square (RMS) evaluated in individual wavebands in the frequency domain. For concrete slab surface with pre-overlay IRI of about 6.0 to 9.5 m/km, post-overlay IRI of 2 m/km was achieved in all 30 sections, and for about 30% of the sections, 2 m/km was accomplished even in the 1st lift. Post-overlay IRI of less than 1 m/km was obtained in 16 out of the 30 sections. For the wide range of surface conditions, it was concluded that smoother pre-overlay surface produces smoother post-overlay surface. Post-overlay IRI is about 20% of pre-overlay IRI with relatively large variation. IRI reduction magnitude (ΔIRI) is about 80% of pre-overlay IRI, and the relationship is almost linear with high statistical significance. Thus, it was concluded that IRI reduction rate is independent of surface roughness level. In addition, it was concluded that smoothness prediction with respect to IRI reduction is more reliable than IRI value itself. RMS reduction was over 90% of pre-overlay smoothness with very high statistical significance. Smoothness reduction effect between two consecutive 4 cm-thick overlay was found to be diminished towards longer wavebands.

Supplemental Notes:

This paper was sponsored by TRB committee AFD90 Surface Properties - Vehicle Interaction.

Monograph Accession #:

01550057

Report/Paper Numbers:

15-2432

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Bae, Abraham
Lee, David
Tan, Jun Yew

Pagination:

12p

Publication Date:

2015

Conference:

Transportation Research Board 94th Annual Meeting

Location: Washington DC, United States
Date: 2015-1-11 to 2015-1-15
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; Photos; References; Tables

Identifier Terms:

International Roughness Index

Geographic Terms:

Singapore

Subject Areas:

Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces

Source Data:

Transportation Research Board Annual Meeting 2015 Paper #15-2432

Files:

TRIS, TRB, ATRI

Created Date:

Dec 30 2014 12:52PM