A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Permeability of asphalt mixtures exposed to freeze–thaw cycles
Abstract The objective of this research is to assess the permeability of asphalt mixtures exposed to freeze–thaw cycles in the cold region. Three types of asphalt mixtures were produced in a lab environment. A special constant head permeameter following the UNI EN 12697/19 protocol was adopted to evaluate the permeability of asphalt mixtures exposed to freeze–thaw cycles. The permeability of asphalt mixtures mainly focuses on two aspects: regime of flow in asphalt mixtures and hydraulic conductivity of asphalt mixtures. Results showed that the discharge velocity and hydraulic conductivity of asphalt mixtures are aggravated when samples are subjected to freeze–thaw cycles. Accordingly, the critical Reynolds number and corresponding critical hydraulic gradient for each sample decrease when freeze–thaw cycles increase. Results indicated that water can move through the asphalt mixture more easily because of the freeze–thaw cycles, and the scouring effect of water flow on the internal structure of asphalt mixtures becomes more significant. Linear regression equations were utilized on the collected data to determine the susceptibility of permeability growth rate of asphalt mixtures under freeze–thaw cycles to gradation type. Open graded asphalt mixtures exhibited steeper slopes compared with the other mixtures, which indicated their higher susceptibility to freeze–thaw cycles.
Highlights We study the flow regime in asphalt mixes and reveal the existence of turbulent flow. Illustrate the internal structure under freeze–thaw cycles by X-ray CT images Examine the impact of freeze–thaw cycles on permeability of asphalt mixes Analyze the role of grading on permeability of asphalt mixes under freeze–thaw cycles
Permeability of asphalt mixtures exposed to freeze–thaw cycles
Abstract The objective of this research is to assess the permeability of asphalt mixtures exposed to freeze–thaw cycles in the cold region. Three types of asphalt mixtures were produced in a lab environment. A special constant head permeameter following the UNI EN 12697/19 protocol was adopted to evaluate the permeability of asphalt mixtures exposed to freeze–thaw cycles. The permeability of asphalt mixtures mainly focuses on two aspects: regime of flow in asphalt mixtures and hydraulic conductivity of asphalt mixtures. Results showed that the discharge velocity and hydraulic conductivity of asphalt mixtures are aggravated when samples are subjected to freeze–thaw cycles. Accordingly, the critical Reynolds number and corresponding critical hydraulic gradient for each sample decrease when freeze–thaw cycles increase. Results indicated that water can move through the asphalt mixture more easily because of the freeze–thaw cycles, and the scouring effect of water flow on the internal structure of asphalt mixtures becomes more significant. Linear regression equations were utilized on the collected data to determine the susceptibility of permeability growth rate of asphalt mixtures under freeze–thaw cycles to gradation type. Open graded asphalt mixtures exhibited steeper slopes compared with the other mixtures, which indicated their higher susceptibility to freeze–thaw cycles.
Highlights We study the flow regime in asphalt mixes and reveal the existence of turbulent flow. Illustrate the internal structure under freeze–thaw cycles by X-ray CT images Examine the impact of freeze–thaw cycles on permeability of asphalt mixes Analyze the role of grading on permeability of asphalt mixes under freeze–thaw cycles
Permeability of asphalt mixtures exposed to freeze–thaw cycles
Xu, Huining (author) / Guo, Wei (author) / Tan, Yiqiu (author)
Cold Regions, Science and Technology ; 123 ; 99-106
2015-12-06
8 pages
Article (Journal)
Electronic Resource
English
Resistance to Freeze-Thaw Cycles of Some Asphalt Cold Mixtures
| British Library Conference Proceedings | 1994