Influence of foam condition on foam expansion rate of base asphalt

HAN Yue-jie; DING Zhi-yong; WU You; LI Jun

doi:10.19818/j.cnki.1671-1637.2019.03.003

Volume 19 Issue 3

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HAN Yue-jie, DING Zhi-yong, WU You, LI Jun. Influence of foam condition on foam expansion rate of base asphalt[J]. Journal of Traffic and Transportation Engineering, 2019, 19(3): 19-26. doi: 10.19818/j.cnki.1671-1637.2019.03.003

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HAN Yue-jie, DING Zhi-yong, WU You, LI Jun. Influence of foam condition on foam expansion rate of base asphalt[J]. Journal of Traffic and Transportation Engineering, 2019, 19(3): 19-26. doi: 10.19818/j.cnki.1671-1637.2019.03.003

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Influence of foam condition on foam expansion rate of base asphalt

doi: 10.19818/j.cnki.1671-1637.2019.03.003

1.
Key Laboratory of Special Region Highway Projects of Ministry of Education, Chang'an University, Xi'an 710064, Shaanxi, China
2.
Key Laboratory of Road Construction Technology and Equipment of Ministry of Education, Chang'an University, Xi'an 710064, Shaanxi, China

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Author Bio:
HAN Yue-jie (1978-), PhD, 337931500@qq.com
Corresponding author: DING Zhi-yong(1977-), associate professor, PhD, dzy@chd.edu.cn
Received Date: 2018-12-08
Publish Date: 2019-06-25

Abstract

Abstract

A 3 D modeling of asphalt generator was carried out by the modeling software Solidworks. The finite element simulation software Fluent was used to simulate the base asphalt foaming processes under different parameters, and the results from the experiment and the simulation were compared. The reliability of finite element simulation technology on the study of base asphalt foam expansion rate was analyzed. The finite element simulation was performed on the foaming cavity and fluid materials inside the foaming cavity. The distributed cloud images of temperature, velocity, pressure, and various phases in the foaming cavity were investigated by using the Fluent post-processing function. Simulation result shows that during the whole foaming process, the increase of base asphalt temperature results in the decrease of asphalt viscosity and the increase of water vapor in the foaming cavity. When the base asphalt temperature rises from 120 to 160 ℃, the foam expansion rate of base asphalt increases from 4 to 11, revealing a great impact of base asphalt temperature on the foam expansion rate. The increase of base asphalt flow rate serves to the increase of total amount of base asphalt in the foaming cavity and reduces the contact time and area between the base asphalts. When the entrance flow rate of base asphalt increases from 60 to 120 g·s^-1, the foam expansion rate of base asphalt fluctuates between 7 and 11, indicating that the change of base asphalt flow rate has a great impact on its foam expansion rate. When the water consumption increases from 2.0% to 3.5%, the foam expansion rate of base asphalt remains the same basically, indicating that the water consumption has little effect on the foam expansion rate of base asphalt. The lowest foam expansion rate obtained by the simulation is 3.57. At this time, the base asphalt flow rate is 120 g·s^-1, the base asphalt temperature is 120 ℃, and the water consumption is 3.0%.
- pavement engineering,
- base asphalt,
- foaming cavity,
- distributed cloud image,
- foam expansion rate,
- water consumption

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References(28)

References

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Influence of foam condition on foam expansion rate of base asphalt

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