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Materials 2019, 12(8), 1230; https://doi.org/10.3390/ma12081230

Dynamic Modulus of Porous Asphalt and the Effect of Moisture Conditioning

1
Department of Civil and Environmental Engineering, Pusan National University, Busan 46241, Korea
2
Department of Civil Engineering, Chonbuk National University, Jeonju-si 54896, Korea
3
Korea Expressway Corporation Research Institute, Hwaseong-si 18489, Korea
*
Author to whom correspondence should be addressed.
Received: 6 March 2019 / Revised: 18 March 2019 / Accepted: 21 March 2019 / Published: 15 April 2019
(This article belongs to the Section Construction and Building Materials)
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Abstract

Porous asphalt has been used for permeable pavement to improve safety of roadways and the effectiveness of storm water management. As a surface drainage layer with frequent exposure to water, this material is affected by moisture. In this study, dynamic modulus tests were performed on both moisture unconditioned and conditioned specimens to characterize viscoelastic properties of porous asphalt mixture. The dynamic modulus values of porous asphalt materials with air void content of 9.0% and 20.5% were investigated at dry condition and after specified moisture conditioning cycles. One cycle of moisture conditioning procedure included placing specimens in water tank at 60 °C for 24 h, and then in another water tank at 25 °C for additional 2 h. The results showed that porous asphalt mixture with lower air void content resulted in higher values of dynamic modulus, and these values of porous asphalt with air void content of 9.0% was about 1.5 to 3.0 times that of porous asphalt with air void content of 20.5%. Higher value of the first number of performance graded binder (average 7-day maximum pavement design temperature) seems to make the dynamic modulus values at high temperatures larger. After moisture conditioning, the dynamic modulus of porous asphalt mixture increased, overall, especially at low temperatures. The appropriated selection of asphalt binder, a weakening of asphalt due to moisture damage can be reduced. View Full-Text
Keywords: dynamic modulus; porous asphalt; moisture susceptibility; ratio of modulus; freeze-thaw cycle dynamic modulus; porous asphalt; moisture susceptibility; ratio of modulus; freeze-thaw cycle
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Nguyen, T.H.; Ahn, J.; Lee, J.; Kim, J.-H. Dynamic Modulus of Porous Asphalt and the Effect of Moisture Conditioning. Materials 2019, 12, 1230.

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