Research progress of thermal resistance asphalt mixture
(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2020年1期
- Page:
- 125-134
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Research progress of thermal resistance asphalt mixture
- Author(s):
- GAO Zhiwei1; LIU Luqing2; XIAO Xudang2; WANG Chaohui2; MU Ke3
- 1. School of Information Engineering, Xizang Minzu University, Xianyang 712082, Shaanxi, China； 2. School of
〖JP〗
Highway, Changan University, Xian 710064, Shaanxi, China； 3. CCCC First Highway Consultants
Co., Ltd., Xian 710068, Shaanxi, China
- Keywords:
- road engineering; thermal resistance aggregate; thermal resistance asphalt mixture; ; pavement performance; cooling
- PACS:
- -
- DOI:
- -
- Abstract:
- To further evaluate the pavement performance and heatresistance and cooling effects of thermalresistant asphalt mixture, the current research results on thermalresistant asphalt pavements were sorted out systematically, the common types and key technical indicators of road thermalresistant aggregates were defined, and the basic performance of road thermalresistant aggregates was evaluated. The investigation results were based on the pavement performance of thermalresistant asphalt mixture. Mathematical statistical analysis was used to determine the particle size and application mode of thermalresistant aggregates commonly used in thermalresistant asphalt mixture, and the pavement performance of the thermalresistant asphalt mixture was evaluated. Based on investigation results of the cooling effect of thermal resistance asphalt mixture, the cooling test methods of thermal resistance asphalt mixture were carded, the thermal blocking mechanism of thermal resistance asphalt mixture were analyzed and the cooling efficiency of thermal resistance asphalt mixture were evaluated comparatively. The results show that road thermalresistant aggregates mainly include bauxite, ceramics, expanded vermiculite and porous basalt. The thermal conductivity of road thermalresistant aggregates are low, but their mechanical properties are generally poor. The common application modes of thermalresistant aggregates in thermalresistant asphalt mixture mainly include equal volume replacement of common coarse or fine aggregates, setting the thermalresistant adhesive seal layer between layers, and paving the thermalresistant thin layer on the road surface. Compared with ordinary asphalt mixture, the pavement performance of the thermalresistant asphalt mixture has obvious differences. Among them, the hightemperature stability of ceramics and bauxite thermal resistance asphalt mixture decrease by about 10% to 15% on average. The hightemperature stability of porous basalt and expanded vermiculite in thermalresistant asphalt mixtures tend to increase. However, the lowtemperature performance of thermalresistant asphalt mixture do not change significantly, although its water stability decrease significantly. When thermalresistant aggregates are used in the thermalresistant asphalt mixture instead of ordinary aggregates, the temperature drop of the specimen with thickness of 5 cm ranged from 4 ℃ to 7 ℃. Bauxite has the most significant cooling effect, reaching 6.2 ℃. Ceramics can effectively prevent heat transfer in the asphalt mixture, but will accumulate heat on the surface of the specimen, resulting in increased surface temperature.
4 tabs, 8 figs, 34 refs.
Last Update: 2020-01-17