TY - GEN
T1 - Evaluation of fatigue resistance of asphalt mixes using Four Point Beam Fatigue and Semi-Circular Bend test methods
AU - Barman, M.
AU - Ghabchi, R.
AU - Singh, D. V.
AU - Zaman, M.
AU - Commuri, S.
AU - Hobson, K.
PY - 2015
Y1 - 2015
N2 - Fatigue cracking is one of the dominant distresses in flexible pavements. Therefore, evaluation of fatigue resistance of asphalt mixes is immensely important during the mix design stage. Many researchers have proposed different test methods for characterizing fatigue resistance of asphalt mixes, namely, Four Point Beam Fatigue (BF), Semi-Circular Bend (SCB), Indirect Tensile Test (IDT), Cyclic Direct Tension (CDT), and Overlay Tester (OT). However, in reality, fatigue tests are commonly not practiced in many Departments of Transportation (DOTs) in the U.S.A. Many DOTs avoid fatigue tests probably because of the absence of a consensus for an appropriate fatigue test method, non-uniformity in the test procedures, tediousness in calculations and shortage of trained personnel. Some DOTs may not be in a position to adopt a particular fatigue test method because of lack of significant studies covering fatigue resistance of different types of asphalt mixes and test methods. This paper evaluates fatigue resistance of two different mixes: one prepared with an unmodified (PG 64-22) binder and the other with a polymer-modified (PG 76-28) binder.Two different test methods (BF and SCB) were used. As expected, the results from both these methods indicated that the PG 76-28 mix has better fatigue resistance properties. The repeatability of the test results were studied for both test methods. It was found that a better repeatability in the results can be obtained from the SCB test.
AB - Fatigue cracking is one of the dominant distresses in flexible pavements. Therefore, evaluation of fatigue resistance of asphalt mixes is immensely important during the mix design stage. Many researchers have proposed different test methods for characterizing fatigue resistance of asphalt mixes, namely, Four Point Beam Fatigue (BF), Semi-Circular Bend (SCB), Indirect Tensile Test (IDT), Cyclic Direct Tension (CDT), and Overlay Tester (OT). However, in reality, fatigue tests are commonly not practiced in many Departments of Transportation (DOTs) in the U.S.A. Many DOTs avoid fatigue tests probably because of the absence of a consensus for an appropriate fatigue test method, non-uniformity in the test procedures, tediousness in calculations and shortage of trained personnel. Some DOTs may not be in a position to adopt a particular fatigue test method because of lack of significant studies covering fatigue resistance of different types of asphalt mixes and test methods. This paper evaluates fatigue resistance of two different mixes: one prepared with an unmodified (PG 64-22) binder and the other with a polymer-modified (PG 76-28) binder.Two different test methods (BF and SCB) were used. As expected, the results from both these methods indicated that the PG 76-28 mix has better fatigue resistance properties. The repeatability of the test results were studied for both test methods. It was found that a better repeatability in the results can be obtained from the SCB test.
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U2 - 10.1201/b17435-77
DO - 10.1201/b17435-77
M3 - Conference contribution
AN - SCOPUS:84907323022
SN - 9781138001480
T3 - Computer Methods and Recent Advances in Geomechanics - Proceedings of the 14th Int. Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014
SP - 459
EP - 464
BT - Computer Methods and Recent Advances in Geomechanics - Proc. of the 14th International Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014
PB - Taylor and Francis - Balkema
T2 - 14th International Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014
Y2 - 22 September 2014 through 25 September 2014
ER -