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Rheological properties of aged asphalt based on Arrhenius equation(PDF)

长安大学学报(自然科学版)[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2017年05期
Page:
1-7
Research Field:
道路工程
Publishing date:

Info

Title:
Rheological properties of aged asphalt based on Arrhenius equation
Author(s):
LI Pei-long MA Li-xia FENG Zhen-gang LI Xin-jun
Key Laboratory of Highway Structure & Materials of Ministry of Transport, Chang’an University, Xi’an 710064, Shaanxi, China
Keywords:
road engineering rheological property asphalt aging visco-flow activation energy low temperature creep
PACS:
U416.217
DOI:
-
Abstract:
To analyze rheological properties of asphalt in the process of aging, a series of aging tests were conducted on five regular asphalt samples for different time by rolling thin film oven test (RTFOT) in the laboratory, and then Brookfield viscosimeter and low temperature bending beam rheometer (BBR) were carried out on asphalt samples with different aging states to measure rational viscosity and low temperature rheological parameters, respectively. The parameter visco-flow activation energy Eη of asphalt was calculated by using Arrhenius equation according to the viscosity values at different temperatures. The changing regularity of Eη during the aging process, the change of low-temperature stiffness modulus, the change rate of stiffness with time m and the RTFOT aging time were analyzed. And the relationship between the visco-flow activation energy Eη and m was discussed. The results show that the parameter visco-flow activation energy Eη for different aging state can be obtained by means of Arrhenius equation, which reflects the rheological properties and temperature sensibility of asphalt. With the deepening of aging, Eη of asphalt increases continuously. There is significant influence of aging on rheological behavior of asphalt. After aging of asphalt, the change of molecular structure leads to the increase of flow energy and the decrease of flexibility. There is no inevitable relationship between Eη and the viscosity value of asphalt although they both increase after aging. The viscosity changes with the actual reflection of rheological properties of asphalt. The increase rate of viscous-flow activation energy of different asphalt at different stages of RTFOT aging, such as 0 to 85, 85 to 180 and 180 to 360 min is different, which reflects the difference of aging resistance and aging mechanism. The resistance to short-term aging capacity is not same to long-term aging capacity, SK and ZHH asphalts have good resistance to short-term aging performance, but ESSO and SK asphalts have the best resistance to long-term aging performance. With the deepening of aging time, it shows a better negative correlation between Eη and the rate of low temperature creep stiffness, that is, the viscous flow characteristics are closely related to the low temperature creep behavior of asphalt.

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Last Update: 2017-10-16