Details:

Creators:
Sabahfar, Nassim ; Hossain, Mustaque
Sabahfar, Nassim ; Hossain, Mustaque Less -
Corporate Creators:
Kansas State University. Transportation Center
Corporate Contributors:
Kansas. Dept. of Transportation. Bureau of Research
Subject/TRT Terms:
[+]
Asphalt Rejuvenating Agent Binder Properties Bituminous Binders Hot In-place Recycling Reclaimed Asphalt Pavements
Publication/ Report Number:
KS-16-12
Resource Type:
Tech Report
Geographical Coverage:
Kansas
Corporate Publisher:
Kansas. Dept. of Transportation. Bureau of Research
Abstract:
Hot in-place recycling (HIR) preserves distressed asphalt pavements while minimizing use of virgin binder

and aggregates. The final quality of an HIR mixture depends on the characteristics of the original binder, aging of the

pavement surface during service, and whether or not new binder or rejuvenator was added to the mixture. An HIR

mixture should maintain desired properties for additional service periods, making asphalt binder modification

inevitable. Asphalt binder modifications in HIR are commonly performed by adding an asphalt rejuvenating agent

(ARA). However, ARA may adversely affect the qualities of new HIR and potentially fail to improve the quality of the

final surface.

The objective of this research was to investigate the effects of rejuvenation on HIR performance characteristics

by assessing critical performance indicators such as stiffness, permanent deformation, moisture susceptibility, and

cracking resistance. A two-step experimental program was designed that included mechanical property measurements

of the HIR mixture and rheological properties of the extracted binder. The level of mixing occurring between new and

aged binder with ARA was also investigated. HIR samples were obtained from three Kansas Department of

Transportation projects, and Hamburg wheel-tracking device, dynamic modulus, flow number, Texas overlay, thermal

stress restrained specimen, and moisture susceptibility tests were conducted on mixtures with and without ARA.

Rheological studies on the extracted binder included dynamic shear rheometer and bending beam rheometer tests. The

miscibility of new and aged binder was investigated using scanning electron microscope (SEM) images, energy

dispersive X-ray spectroscopy (EDXS), and the exudation droplet test (EDT). Study results showed significant

variability in the mechanical performance of HIR mixtures, which was attributed to the variability of binders as

observed in EDT, SEM, and EDXS studies.

Life-cycle cost analysis (LCCA) showed that HIR is an economic maintenance alternative for asphalt projects

in Kansas. LCCA results showed that pavement design strategies with HIR activities will result in alternatives with

lower net present values when compared to alternatives without HIR maintenance activities.


Format:
PDF
Funding:
C1935
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:0bdb9cf815cdbffc6939e5adc8ad63852b98c6e9f72a422826d396739e556880
Download URL:
https://rosap.ntl.bts.gov/view/dot/31613/dot_31613_DS1.pdf
File Type:

Supporting Files

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