Dynamic Modulus of Porous Asphalt and the Effect of Moisture Conditioning
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...
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doaj-8be9342f421d4fc9bd0b3d603024f1fc2020-11-25T00:50:35ZengMDPI AGMaterials1996-19442019-04-01128123010.3390/ma12081230ma12081230Dynamic Modulus of Porous Asphalt and the Effect of Moisture ConditioningTan Hung Nguyen0Jaehun Ahn1Jaejun Lee2Jin-Hwan Kim3Department of Civil and Environmental Engineering, Pusan National University, Busan 46241, KoreaDepartment of Civil and Environmental Engineering, Pusan National University, Busan 46241, KoreaDepartment of Civil Engineering, Chonbuk National University, Jeonju-si 54896, KoreaKorea Expressway Corporation Research Institute, Hwaseong-si 18489, KoreaPorous 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.https://www.mdpi.com/1996-1944/12/8/1230dynamic modulusporous asphaltmoisture susceptibilityratio of modulusfreeze-thaw cycle |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Tan Hung Nguyen Jaehun Ahn Jaejun Lee Jin-Hwan Kim |
spellingShingle |
Tan Hung Nguyen Jaehun Ahn Jaejun Lee Jin-Hwan Kim Dynamic Modulus of Porous Asphalt and the Effect of Moisture Conditioning Materials dynamic modulus porous asphalt moisture susceptibility ratio of modulus freeze-thaw cycle |
author_facet |
Tan Hung Nguyen Jaehun Ahn Jaejun Lee Jin-Hwan Kim |
author_sort |
Tan Hung Nguyen |
title |
Dynamic Modulus of Porous Asphalt and the Effect of Moisture Conditioning |
title_short |
Dynamic Modulus of Porous Asphalt and the Effect of Moisture Conditioning |
title_full |
Dynamic Modulus of Porous Asphalt and the Effect of Moisture Conditioning |
title_fullStr |
Dynamic Modulus of Porous Asphalt and the Effect of Moisture Conditioning |
title_full_unstemmed |
Dynamic Modulus of Porous Asphalt and the Effect of Moisture Conditioning |
title_sort |
dynamic modulus of porous asphalt and the effect of moisture conditioning |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2019-04-01 |
description |
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. |
topic |
dynamic modulus porous asphalt moisture susceptibility ratio of modulus freeze-thaw cycle |
url |
https://www.mdpi.com/1996-1944/12/8/1230 |
work_keys_str_mv |
AT tanhungnguyen dynamicmodulusofporousasphaltandtheeffectofmoistureconditioning AT jaehunahn dynamicmodulusofporousasphaltandtheeffectofmoistureconditioning AT jaejunlee dynamicmodulusofporousasphaltandtheeffectofmoistureconditioning AT jinhwankim dynamicmodulusofporousasphaltandtheeffectofmoistureconditioning |
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