Investigation on aging behavior of SBS modified asphalt in water and salt environment: experimental and simulated perspective

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-09-29 DOI:10.1016/j.conbuildmat.2025.143790

Chaojie Li , Yang Zhou , Lei Han , Lele Yang , Wentao Cui , Juntao Shi

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引用次数: 0

Abstract

Although detailed research has been conducted on the aging behavior of asphalt materials in hot and oxygen environments, the aging behavior of asphalt materials, especially SBS modified asphalt, in water salt environments has not been fully studied, which restricts the research on the aging resistance of SBS modified asphalt in high salt and high humidity environments. Therefore, this work conducted the soaking aging and dry-wet cycle aging on SBS modified asphalt, respectively. The physical properties and rheological properties of the SBS modified asphalt was measured. Subsequently, a molecular dynamic (MD) simulation was conducted to reveal the underlying mechanism of this aging behavior. Results indicated that in the early stage of aging, SBS modified asphalt exhibited an abnormal phenomenon of a decrease in softening point and an increase in penetration regardless of the aging types, which was due to the breakdown of the SBS molecular network, and this abnormal phenomenon disappeared in the later stage of aging. Besides, there is a proportional relationship between salt concentration and the aging degree of SBS modified asphalt. Additionally, the calculated results of molecular dynamic (MD) simulation revealed that salt ions can reduce the fractional free volume (FFV) of the SBS modified asphalt and increase the interaction between asphalt molecules, which hinders the movement of asphalt molecules, leading to the increasing stiffness of aged SBS modified asphalt. This study supplied a theoretical basis to extend the service life of SBS modified asphalt pavement in high salt and high humidity areas.

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SBS改性沥青在水盐环境中的老化行为研究：实验与模拟研究

虽然对沥青材料在高温和氧气环境中的老化行为进行了详细的研究，但对沥青材料特别是SBS改性沥青在水盐环境中的老化行为研究还不充分，这制约了SBS改性沥青在高盐、高湿环境中的耐老化性研究。为此，本研究分别对SBS改性沥青进行了浸泡老化和干湿循环老化。测定了SBS改性沥青的物理性能和流变性能。随后，进行了分子动力学（MD）模拟，揭示了这种老化行为的潜在机制。结果表明，SBS改性沥青在老化初期，无论老化类型如何，都表现出软化点降低、渗透增加的异常现象，这是由于SBS分子网络的破坏，这种异常现象在老化后期消失。此外，盐浓度与SBS改性沥青的老化程度成正比关系。此外，分子动力学（MD）模拟计算结果表明，盐离子可以降低SBS改性沥青的分数自由体积（FFV），增加沥青分子之间的相互作用，阻碍沥青分子的运动，导致老化SBS改性沥青的刚度增加。本研究为SBS改性沥青路面在高盐高湿地区延长使用寿命提供了理论依据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

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.