Impacts of Milled Aggregate Gradations and Foamed Asphalt Contents of Cold In-Place Recycling Layer on the Performance of Asphalt Overlays

Hosin Lee; Byungkyu Moon; Ashley Buss; Charles T. Jahren

doi:10.3390/infrastructures10020040

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Impacts of Milled Aggregate Gradations and Foamed Asphalt Contents of Cold In-Place Recycling Layer on the Performance of Asphalt Overlays

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Impacts of Milled Aggregate Gradations and Foamed Asphalt Contents of Cold In-Place Recycling Layer on the Performance of Asphalt Overlays

Hosin Lee, Byungkyu Moon, Ashley Buss and Charles T. Jahren

Infrastructures (Basel), Vol.10(2), 40

02/13/2025

DOI: 10.3390/infrastructures10020040

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Abstract

This paper presents gradations of both Hot In-place Recycling (HIR) and Cold In-place Recycling (CIR) and analysis of cores collected from CIR/Hot Mix Asphalt (HMA) overlay sections in Iowa. Milling samples were obtained from an HIR recycling project on IA 22 in Wellman, Iowa. It was concluded that the average gradation of HIR millings was coarser than that of CIR millings by retaining the original aggregate gradations. Cores were then extracted from CIR pavement with foamed asphalt overlaid by HMA at the right wheel path and between wheel paths at eight locations on US 34 in Mills and Wapello Counties. The cores were cut into discs to isolate the pavement layers, and the discs were fabricated into semicircular bending test specimens. Based on the Semicircular Bending (SCB) tests performed on both CIR and HMA specimens, CIR specimens with higher asphalt binder contents exhibited higher flexibility index values. Since CIR pavement layers were found to be more flexible than the HMA overlay layers, it can be speculated that CIR layers may serve as a stress-relieving layer and mitigate reflective cracking.

cold in-place recycling

forensic analysis

performance

cores

foamed asphalt

hot in-place recycling

flexibility index

semicircular bending test

aggregate gradations

Details

Title: Subtitle: Impacts of Milled Aggregate Gradations and Foamed Asphalt Contents of Cold In-Place Recycling Layer on the Performance of Asphalt Overlays
Creators: Hosin Lee - University of Iowa
Byungkyu Moon - Applied Research Associates
Ashley Buss - Iowa Department of Transportation
Charles T. Jahren - Iowa State University
Resource Type: Journal article
Publication Details: Infrastructures (Basel), Vol.10(2), 40
Publisher: MDPI
DOI: 10.3390/infrastructures10020040
ISSN: 2412-3811
eISSN: 2412-3811
Grant note: Iowa Department of Transportation (DOT)Iowa Highway Research Board (IHRB): TR-774
This research was funded by Iowa Department of Transportation (DOT) and the Iowa Highway Research Board (IHRB), grant number IHRB Project TR-774.
Language: English
Date published: 02/13/2025
Academic Unit: Iowa Technology Institute; Civil and Environmental Engineering; International Programs
Record Identifier: 9984792359702771

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