Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Evolution of dynamic flow behavior in asphalt mixtures exposed to freeze-thaw cycles
https://orcid.org/0000-0003-3731-5519
https://orcid.org/0000-0002-7797-1134
https://orcid.org/0000-0002-7032-4823
Highlights Perform dynamic tracing of moisture flow with Freeze-Thaw (F-T) cycles by X-ray CT. Observe anisotropy of wetting front migration in asphalt mixes under F-T cycles. Analyze impact of F-T cycles in temporal variation of seepage velocity. Discuss evolution of initial inertia region in asphalt mixes under F-T cycles. Clarify high sensitivity of F-T cycles in vertical velocity with small pore size.
Abstract This study aims to understand the evolution of dynamic moisture flow in asphalt mixtures exposed to freeze-thaw cycles. X-ray CT was utilized to capture the moisture dynamics in unsaturated asphalt mixtures during simulated rainfall events. Three main characteristics of the dynamic flow behaviors within asphalt mixtures were measured and monitored, including wetting front position, directional velocity of wetting front, and inertia influence region. It was found that at a specific infiltration rate, freeze-thaw cycles increased the vertical flow penetration and decreased the horizontal flow penetration for both wetting front position and directional velocity, suggesting that seepage anisotropy was exacerbated in asphalt mixtures. The initial inertia of water droplet was mostly converted towards the vertical direction under freeze-thaw effect. As a result, the shape of water transmission was converted from a hemispherical shape to a slender shape under freeze-thaw cycles. Linear regression analysis between direction velocity growth rate in particular samples and freeze-thaw cycles to pore structure was conducted, and it was found that compared with dense-graded mixtures, open-graded mixtures displayed larger slopes for horizontal flow, and smaller slopes for vertical flow, demonstrating the non-negligible effect of pore structure on dynamic flow evolution under freeze-thaw cycles.
Evolution of dynamic flow behavior in asphalt mixtures exposed to freeze-thaw cycles
https://orcid.org/0000-0003-3731-5519
https://orcid.org/0000-0002-7797-1134
https://orcid.org/0000-0002-7032-4823
Highlights Perform dynamic tracing of moisture flow with Freeze-Thaw (F-T) cycles by X-ray CT. Observe anisotropy of wetting front migration in asphalt mixes under F-T cycles. Analyze impact of F-T cycles in temporal variation of seepage velocity. Discuss evolution of initial inertia region in asphalt mixes under F-T cycles. Clarify high sensitivity of F-T cycles in vertical velocity with small pore size.
Abstract This study aims to understand the evolution of dynamic moisture flow in asphalt mixtures exposed to freeze-thaw cycles. X-ray CT was utilized to capture the moisture dynamics in unsaturated asphalt mixtures during simulated rainfall events. Three main characteristics of the dynamic flow behaviors within asphalt mixtures were measured and monitored, including wetting front position, directional velocity of wetting front, and inertia influence region. It was found that at a specific infiltration rate, freeze-thaw cycles increased the vertical flow penetration and decreased the horizontal flow penetration for both wetting front position and directional velocity, suggesting that seepage anisotropy was exacerbated in asphalt mixtures. The initial inertia of water droplet was mostly converted towards the vertical direction under freeze-thaw effect. As a result, the shape of water transmission was converted from a hemispherical shape to a slender shape under freeze-thaw cycles. Linear regression analysis between direction velocity growth rate in particular samples and freeze-thaw cycles to pore structure was conducted, and it was found that compared with dense-graded mixtures, open-graded mixtures displayed larger slopes for horizontal flow, and smaller slopes for vertical flow, demonstrating the non-negligible effect of pore structure on dynamic flow evolution under freeze-thaw cycles.
Evolution of dynamic flow behavior in asphalt mixtures exposed to freeze-thaw cycles
https://orcid.org/0000-0003-3731-5519
https://orcid.org/0000-0002-7797-1134
https://orcid.org/0000-0002-7032-4823
Highlights Perform dynamic tracing of moisture flow with Freeze-Thaw (F-T) cycles by X-ray CT. Observe anisotropy of wetting front migration in asphalt mixes under F-T cycles. Analyze impact of F-T cycles in temporal variation of seepage velocity. Discuss evolution of initial inertia region in asphalt mixes under F-T cycles. Clarify high sensitivity of F-T cycles in vertical velocity with small pore size.
Abstract This study aims to understand the evolution of dynamic moisture flow in asphalt mixtures exposed to freeze-thaw cycles. X-ray CT was utilized to capture the moisture dynamics in unsaturated asphalt mixtures during simulated rainfall events. Three main characteristics of the dynamic flow behaviors within asphalt mixtures were measured and monitored, including wetting front position, directional velocity of wetting front, and inertia influence region. It was found that at a specific infiltration rate, freeze-thaw cycles increased the vertical flow penetration and decreased the horizontal flow penetration for both wetting front position and directional velocity, suggesting that seepage anisotropy was exacerbated in asphalt mixtures. The initial inertia of water droplet was mostly converted towards the vertical direction under freeze-thaw effect. As a result, the shape of water transmission was converted from a hemispherical shape to a slender shape under freeze-thaw cycles. Linear regression analysis between direction velocity growth rate in particular samples and freeze-thaw cycles to pore structure was conducted, and it was found that compared with dense-graded mixtures, open-graded mixtures displayed larger slopes for horizontal flow, and smaller slopes for vertical flow, demonstrating the non-negligible effect of pore structure on dynamic flow evolution under freeze-thaw cycles.
Evolution of dynamic flow behavior in asphalt mixtures exposed to freeze-thaw cycles
Xu, Huining (Autor:in) / Shi, Hao (Autor:in) / Zhang, Huanyu (Autor:in) / Li, Hengzhen (Autor:in) / Leng, Zhen (Autor:in) / Tan, Yiqiu (Autor:in)
22.04.2020
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Permeability of asphalt mixtures exposed to freeze–thaw cycles
| Elsevier | 2015
Resistance to Freeze-Thaw Cycles of Some Asphalt Cold Mixtures
| British Library Conference Proceedings | 1994