Hydrothermal process of asphalt pavement in high latitudesregions of Inner Mongolia(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2021年6期
- Page:
- 10-18
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Hydrothermal process of asphalt pavement in high latitudesregions of Inner Mongolia
- Author(s):
- ZHANG Hongwei1; 2; WANG Xueying1; 2; ZHAO Xin1; 3; GUO Ying4
- (1. Inner Mongolia Autonomous Region Transportation Research Development Institute; 2. Key Laboratory of Transport Industry of Management, Control and Cycle Repair Technology for Traffic Network Facilities in Ecological Security Barrier Area; 4. Institute of Cold RegionsScience and Engineering, Northeast Forestry University, Harbin 150040, Heilongjiang, China)
- Keywords:
- road engineering; freezingthawing cycle; hydrothermal process; hysteresis; filed observation
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to grasp the influencing factors and changing laws of highway frost heave characteristics in the high latitudes permafrost regions of Inner Mongolia, based on the field measurements in temperature and moisture of subgrade and pavement were carried out on the National Highway G331 from Shiwei to Labudalin, the freezingthawing process, moisture distribution features and hydrothermal interaction within the pavement structure were analyzed. Meanwhile, according to the theory of heat and mass transfer in porous media, the migration behavior of unfrozen water in the pavement structure layer was analyzed. The results show that the pavement structure presents the significant heat absorption and storage effect due to the heat absorption of the asphalt surface layer and the heat storage of the base structure. Under this effect, the roadbed shows a significant bidirectional thawing phenomenon. Besides, the distribution frequency of pavement structure presents a significant two peaks feature. Therefore, the pavement temperature field has a significant bimodal feature, in which extreme temperatures occur more frequently, and the distribution frequencies of high temperature peak and low temperature peak are 20% and 15%, respectively. Under the influence of the thermal effect of the pavement structure, water migration in the pavement is very active, and the liquid water content shows significant seasonal changes. In the warm season, the liquid water content is higher. In the cold season, the liquid water content decreases sharply due to the waterice phase change. In the depth direction, the liquid water content is distributed in a discontinuous state. The subbase layer is the main space where moisture accumulates in the pavement structure layer, and the water content at the base layer is the smallest. With the effect of the external freezingthawing alternations, the liquid water content in the base layer and subbase layer exhibits the hysteresis of the different degrees. This phenomenon mainly occurs at the temperature of above -10 ℃, and the liquid water content in the cooling period is slightly higher than that in the warming period. Additionally, the base layer of asphalt pavement has a unidirectional migration behavior of unfrozen water, while the subbase layer has a bidirectional migration behavior of unfrozen water. 2 tabs, 12 figs, 25 refs.
Last Update: 2021-12-14