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Functional Design of Skeleton-Dense Asphalt Mixtures in High Humidity and Heat Regions.

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Title: Functional Design of Skeleton-Dense Asphalt Mixtures in High Humidity and Heat Regions.
Authors: Tian, Shaoqiang1 (AUTHOR) tiansq@crbc.com, Wang, Jixiang2 (AUTHOR) wang381438670@163.com, Li, Gang1 (AUTHOR) 2486268201@qq.com, Gao, Xin1 (AUTHOR) 913265456@qq.com, Zeng, Feng1 (AUTHOR) zeng.f@qq.com, Chen, Bo3,4 (AUTHOR) chenb@fosu.edu.cn
Source: International Journal of Pavement Research & Technology. May2026, Vol. 19 Issue 5, p1050-1062. 13p.
Subjects: Thermal stability, Water damage, Skid resistance, Asphalt modifiers, Tropical climate, Asphalt pavements, Meteorological precipitation analysis
Geographic Terms: Cambodia
Abstract: To reduce the early distresses of highway asphalt pavements in high humidity and heat regions and to extend the service life of roads, an analysis of the temperature and rainfall characteristics of the project area was conducted based on the expressway from Phnom Penh to Sihanoukville in Cambodia. The functional requirements of asphalt pavement structures in humid and hot regions were reviewed, and asphalt mixtures for different layers were designed. Through a comparative analysis of the pavement performance of mixtures for different structural layers, a suitable asphalt mixture design scheme for high humidity and heat climates was recommended. The results show that the primary functional requirements of highway asphalt pavement layers differ under humid and hot climates, with high-temperature stability and water stability being critical performance indicators. The upper layer should also consider skid resistance. A skeleton-dense asphalt mixture was designed based on the CAVF method, and the digital image analysis method not only visually distinguishes the strength of coarse aggregate skeletons in different mixtures but also reveals the uniformity of the distribution of coarse aggregate particles within the mixtures. A test temperature of 70 °C was proposed for evaluating the high-temperature performance of the middle and upper layer asphalt mixtures. The dynamic stability of the AC(M) mixture increased by approximately 20%. Although the strength attenuation of coarse asphalt mixtures after immersion is slightly greater, their structural strength in resisting loads remains higher than that of traditional fine mixtures. The strong skeleton state of the improved mixture helps enhance the durability of the road surface's anti-slip texture. The bottom layer ATB-25 mixture using 50# asphalt has better high-temperature performance, water stability, and engineering economy than the 70# asphalt, making it more suitable for the lower layer structure of asphalt in high humidity and heat regions. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:To reduce the early distresses of highway asphalt pavements in high humidity and heat regions and to extend the service life of roads, an analysis of the temperature and rainfall characteristics of the project area was conducted based on the expressway from Phnom Penh to Sihanoukville in Cambodia. The functional requirements of asphalt pavement structures in humid and hot regions were reviewed, and asphalt mixtures for different layers were designed. Through a comparative analysis of the pavement performance of mixtures for different structural layers, a suitable asphalt mixture design scheme for high humidity and heat climates was recommended. The results show that the primary functional requirements of highway asphalt pavement layers differ under humid and hot climates, with high-temperature stability and water stability being critical performance indicators. The upper layer should also consider skid resistance. A skeleton-dense asphalt mixture was designed based on the CAVF method, and the digital image analysis method not only visually distinguishes the strength of coarse aggregate skeletons in different mixtures but also reveals the uniformity of the distribution of coarse aggregate particles within the mixtures. A test temperature of 70 °C was proposed for evaluating the high-temperature performance of the middle and upper layer asphalt mixtures. The dynamic stability of the AC(M) mixture increased by approximately 20%. Although the strength attenuation of coarse asphalt mixtures after immersion is slightly greater, their structural strength in resisting loads remains higher than that of traditional fine mixtures. The strong skeleton state of the improved mixture helps enhance the durability of the road surface's anti-slip texture. The bottom layer ATB-25 mixture using 50# asphalt has better high-temperature performance, water stability, and engineering economy than the 70# asphalt, making it more suitable for the lower layer structure of asphalt in high humidity and heat regions. [ABSTRACT FROM AUTHOR]
ISSN:19971400
DOI:10.1007/s42947-025-00502-x