Abstract

Oxidative aging stiffens asphalt in the pavement, raising brittleness, cracking potential, and deterioration of pavement serviceability. Mechanical testing of long-term aged asphalt concrete in the laboratory has shown elevated stiffness, higher failure load (peak load), and reduced fatigue cracking resistance. Among the laboratory mechanical tests used to evaluate mix fatigue resistance and flexibility is the semicircular bend (SCB) test. This study was conducted to determine how the properties of the long-term aged asphalt mixes compare with those from short-term aged asphalt mixes tested under SCB test. Such comparison is important as a decision needs to be made by mix designers as to what aging level to apply when testing asphalt concrete to evaluate fatigue resistance. The mix variables included air void, binder content, and binder stiffness. The properties that were measured, i.e., the response parameters, included fracture energy, load at failure (peak load), mix stiffness, and flexibility index. A large number of mixes including various aggregates, gradations, and binder contents were included in the study. Results showed that long-term oven aging significantly changed flexibility index, peak load, and stiffness of tested specimens. Sensitivity of the parameters to aging was also evaluated in the context of an aging index and defined as the ratio of the measured property after long-term aging to that after short-term aging. In this respect, the aging index did not change as the binder content changed. However, the aging index was sensitive to variations in air void and binder stiffness.

References

1.
Kim
Y. R.
,
Castorena
C.
,
Elwarny
M.
,
Rad
F. Y.
,
Underwood
S.
,
Gundla
A.
,
Gudipudi
P.
,
Farrar
M. J.
, and
Glaser
R. R.
,
NCHRP Research Report 871: Long-Term Aging of Asphalt Mixtures for Performance Testing and Prediction
(
Washington, DC
:
Transportation Research Board
,
2018
).
2.
Liang
R. Y.
and
Lee
S.
, “
Short-Term and Long-Term Aging Behavior of Rubber Modified Asphalt Paving Mixture
,”
Transportation Research Record: Journal of the Transportation Research Board
1530
, no. 
1
(January
1996
):
11
17
. https://doi.org/10.1177/0361198196153000102
3.
Harvey
J.
and
Tsai
B.-W.
, “
Long-Term Oven-Aging Effects on Fatigue and Initial Stiffness of Asphalt Concrete
,”
Transportation Research Record: Journal of the Transportation Research Board
1590
, no. 
1
(January
1997
):
89
98
. https://doi.org/10.3141/1590-11
4.
Raad
L.
,
Saboundjian
S.
, and
Minassian
G.
, “
Field Aging Effects on Fatigue of Asphalt Concrete and Asphalt-Rubber Concrete
,”
Transportation Research Record: Journal of the Transportation Research Board
1767
, no. 
1
(January
2001
):
126
134
. https://doi.org/10.3141/1767-16
5.
Braham
A. F.
,
Buttlar
W. G.
,
Clyne
T. R.
,
Marasteanu
M. O.
, and
Turos
M. I.
. “
The Effect of Long-Term Laboratory Aging on Asphalt Concrete Fracture Energy
,”
Journal of the Association of Asphalt Paving Technologists
78
(March
2009
):
417
454
.
6.
Islam
M. R.
and
Tarefder
R. A.
, “
Study of Asphalt Aging through Beam Fatigue Test
,”
Transportation Research Record: Journal of the Transportation Research Board
2505
, no. 
1
(January
2015
):
115
120
. https://doi.org/10.3141/2505-15
7.
Mogawer
W. S.
,
Austerman
A.
,
Roque
R.
,
Underwood
S.
,
Mohammad
L.
, and
Zou
J.
, “
Ageing and Rejuvenators: Evaluating Their Impact on High RAP Mixtures Fatigue Cracking Characteristics Using Advanced Mechanistic Models and Testing Methods
,”
Road Materials and Pavement Design
16
, no. 
sup2
(September
2015
):
1
28
. https://doi.org/10.1080/14680629.2015.1076996
8.
Bonaquist
R.
,
Paye
B.
, and
Johnson
C.
, “
Application of Intermediate Temperature Semi-Circular Bending (SCB) Test Results to Design Mixtures with Improved Load-Associated Cracking Resistance
,”
Journal of the Association of Asphalt Paving Technologists
86
(March
2017
):
1
35
.
9.
Chong
K. P.
and
Kuruppu
M. D.
, “
New Specimen for Fracture Toughness Determination for Rock and Other Materials
,”
International Journal of Fracture
26
, no. 
2
(October
1984
):
59
62
. https://doi.org/10.1007/BF01157555
10.
Molenaar
A. A. A.
,
Scarpas
A.
,
Liu
X.
, and
Erkens
S. M. J. G.
, “
Semi-Circular Bending Test; Simple but Useful?
,”
Journal of the Association of Asphalt Paving Technologists
71
(March
2002
):
794
815
.
11.
Al-Qadi
I. L.
,
Ozer
H.
,
Lambros
J.
,
El Khatib
A.
,
Singhvi
P.
,
Khan
T.
,
Rivera-Perez
J.
, and
Doll
B.
,
Testing Protocols to Ensure Performance of High Asphalt Binder Replacement Mixes Using RAP and RAS
(
Rantoul, IL
:
Illinois Center for Transportation/Illinois Department of Transportation
,
2015
).
12.
Ozer
H.
,
Al-Qadi
I. L.
,
Singhvi
P.
,
Khan
T.
,
Rivera-Perez
J.
, and
El-Khatib
A.
, “
Fracture Characterization of Asphalt Mixtures with High Recycled Content Using Illinois Semicircular Bending Test Method and Flexibility Index
,”
Transportation Research Record: Journal of the Transportation Research Board
2575
, no.
1
(January
2016
):
130
137
. https://doi.org/10.3141/2575-14
13.
Chen
X.
and
Solaimanian
M.
, “
Simple Indexes to Identify Fatigue Performance of Asphalt Concrete
,”
Journal of Testing and Evaluation
(in press). https://doi.org/10.1520/JTE20170722
14.
Chen
X.
,
Solaimanian
M.
, and
Milander
, “
Rejuvenator Content Optimization Using the Semi-Circular Bend Test and Balanced Mix Design
,”
Journal of Association of Asphalt Paving Technologists
(in press).
15.
Chen
X.
and
Solaimanian
M.
, “
Evaluating Fracture Properties of Crumb Rubber Modified Asphalt Mixes
,”
International Journal of Pavement Research and Technology
12
, no. 
4
(July
2019
):
407
415
.
16.
Newcomb
D.
,
Martin
A. E.
,
Yin
F.
,
Arambula
E.
,
Park
E. S.
,
Chowdhury
A.
,
Brown
R.
, et al.,
NCHRP Report 815: Short-term Laboratory Conditioning of Asphalt Mixtures
(
Washington, DC
:
Transportation Research Board, National Research Council
,
2015
).
17.
Chen
X.
and
Solaimanian
M.
, “
The Effect of Test Temperature and Displacement Rate on Semicircular Bend Test
,”
Journal of Materials in Civil Engineering
31
, no. 
7
(July
2019
): 04019104.
18.
El-Basyouny
M.
and
Jeong
M. G.
, “
Effective Temperature for Analysis of Permanent Deformation and Fatigue Distress on Asphalt Mixtures
,”
Transportation Research Record: Journal of the Transportation Research Board
2127
, no. 
1
(January
2009
):
155
163
. https://doi.org/10.3141/2127-18
19.
Wu
S.
,
Al-Qadi
I. L.
,
Lippert
D. L.
,
Ozer
H.
,
Luque
A. F. E.
, and
Safi
F. R.
, “
Early-Age Performance Characterization of Hot-Mix Asphalt Overlay with Varying Amounts of Asphalt Binder Replacement
,”
Construction and Building Materials
153
(October
2017
):
294
306
. https://doi.org/10.1016/j.conbuildmat.2017.07.114
20.
Zhou
F.
,
Im
S.
,
Hu
S.
,
Newcomb
D.
, and
Scullion
T.
, “
Selection and Preliminary Evaluation of Laboratory Cracking Tests for Routine Asphalt Mix Designs
,”
Road Materials and Pavement Design
18
, no. 
sup1
(January
2017
):
62
86
. https://doi.org/10.1080/14680629.2016.1266741
21.
Solaimanian
M.
and
Chen
X.
, “
Effect of Aging and Compaction Magnitude on Swelling Characteristics of Rubber Modified Asphalts
,” in
Proceedings of the Canadian Society for Civil Engineering Annual Conference
(
Montreal
:
Canadian Society for Civil Engineering
,
2018
).
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