Investigating the Effects of Temperature and Loading Frequency on the Resilient Modulus of SBS Polymer Modified Asphalt Concrete in Dry and Saturated Conditions

Document Type : Research Paper

Authors

1 Assistant Professor, Department of Civil Engineering, University of Zanjan, Zanjan, Iran

2 Associate Professor, Department of Civil and Environmental Engineering, Amirkabir Industrial University, Tehran, Iran

3 Ph.D. Candidate, Department of Civil Engineering, University of Zanjan, Zanjan, Iran

Abstract

Resilient modulus of pavement materials is a key property required for the pavement thickness design. This paper describes the results of an experimental study on the effects of temperature and loading frequency on the resilient modulus of a SBS polymer modified asphalt concrete under dry and saturated conditions. Dynamic creep tests were conducted on dry and saturated specimens of the mixture over a range of temperatures (-5, 5, 20 and 40˚C) and loading frequencies of 0.5, 1, 5 and 10Hz, and the variation of resilient modulus with the number of loading cycles has been evaluated. The results show that, in dry condition, the resilient modulus increases with increasing loading frequency, while, in saturated condition, a slight increase of resilient modulus with loading frequency was observed only at 40˚C. It is also found that, in both the dry and saturated conditions, the effect of loading frequency on the resilient modulus decreases with decreasing temperature. Therefore, the temperature of 40˚C was recommended for investigating the effect of loading frequency on the resilient modulus. In addition, a three-stage model was used for the resilient modulus. It is found that the logarithmic function is more appropriate for prediction of resilient modulus in stage 1.

Keywords

References

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International Journal of Transportation Engineering
Volume 5, Issue 1
July 2017
Pages 1-16

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