Saturation evolution induced by suction effect in asphalt mixtures during air-water two-phase seepage

IF 7.4 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Huining Xu, Xinxing Bian
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Abstract

The unsaturated service state of asphalt pavements caused by air-water two-phase retention and flow is the intrinsic cause of moisture damage and durability deterioration of the asphalt mixture. However, the mechanism by which matric suction, as one of the key driving forces, affects the retention and flow behavior of unsaturated asphalt mixtures has not been understood. Hence, the objectives of this study were to (1) investigate the saturation evolution induced by the suction effect in asphalt mixtures during air-water two-phase seepage and (2) clarify the characteristic relationship between equilibrium saturation and matric suction. Three different types of asphalt mixture were produced in the laboratory. An air-driven water replacement experiment with a controlled suction gradient was conducted to describe the evolution of water saturation induced by different matric suction conditions. The results showed that, at a specific suction level, the evolution of water saturation exhibited two stages: a rapid drainage phase and a dynamic stabilization phase. On this basis, a sensitivity analysis using the Friedman test revealed that the constituent materials (binder and aggregate types) contributed slightly to desaturation, while the void structure characteristic was the main factor influencing desaturation in asphalt mixtures. In a stable unsaturated state, the curve of equilibrium saturation and suction indicated that high matric suction meant low saturation and water retention capacity of the asphalt mixture. For the same matric suction, the densely graded asphalt mixtures exhibited a higher overall water retention capacity than the open-graded friction courses. For the same mixture types, the water retention capacity at high void contents exhibited a more significant sensitivity than that at a low void content. These results contribute to reasonably evaluating the unsaturated hydraulic characteristics in asphalt mixtures, and these characteristics indirectly guide the selection of asphalt pavement materials and structures in areas with frequent dry-wet cycles and freeze-thaw cycles, as well as the measures to prevent moisture damage.
沥青混合料空气-水两相渗流过程中吸力效应引起的饱和演化
空气-水两相滞留与流动导致的沥青路面非饱和服役状态是沥青混合料受潮损伤和耐久性劣化的内在原因。然而,作为关键驱动力之一的基质吸力对非饱和沥青混合料的滞留和流动行为的影响机理尚不清楚。因此,本研究的目的是:(1)研究空气-水两相渗流过程中沥青混合料中吸力效应引起的饱和演化;(2)阐明平衡饱和度与基质吸力之间的特征关系。在实验室中生产了三种不同类型的沥青混合料。通过控制吸力梯度的气驱换水实验,研究了不同基质吸力条件下含水饱和度的变化规律。结果表明:在一定吸力水平下,含水饱和度的演化表现为快速排水阶段和动态稳定阶段;在此基础上,利用Friedman试验进行敏感性分析,发现组成材料(粘结剂和骨料类型)对沥青混合料的减饱和度有轻微影响,而空隙结构特性是影响沥青混合料减饱和度的主要因素。在稳定的非饱和状态下,平衡饱和和吸力曲线表明,高基质吸力意味着沥青混合料的饱和度和保水能力较低。在相同的基质吸力下,密级配沥青混合料的总体保水能力高于开级配摩擦层。对于相同的混合物类型,高孔隙含量时的保水能力比低孔隙含量时表现出更显著的敏感性。这些结果有助于合理评价沥青混合料的非饱和水力特性,并间接指导干湿循环和冻融循环频繁地区沥青路面材料和结构的选择,以及防止水分破坏的措施。
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来源期刊
Construction and Building Materials
Construction and Building Materials 工程技术-材料科学:综合
CiteScore
13.80
自引率
21.60%
发文量
3632
审稿时长
82 days
期刊介绍: Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.
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