不同预处理橡胶屑改性沥青的老化性能及微观特性

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

Construction and Building Materials Pub Date : 2025-02-07 DOI:10.1016/j.conbuildmat.2025.139955

Jianwei Zhang, Meizhu Chen, Shaopeng Wu, Yuechao Zhao, Yansong Fan, Dongyu Chen

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引用次数: 0

摘要

橡胶屑预处理能显著增强其与沥青的界面相容性，提高橡胶屑改性沥青的和易性。然而，预处理CR的结构和内部成分不可避免地会发生改变，不同预处理CR对CRMA抗老化性能的差异需要系统研究。本研究分别采用微波活化、废食用油（WCO）膨胀和碱溶液浸泡预处理CR，制备了相应的crma活化、crma膨胀和crma浸泡改性沥青。然后，对不同类型的粘结剂进行了实验室薄膜烘箱试验（TFOT）和加压老化容器试验（PAV），系统研究了不同类型的crma在老化前后的流变性能。随后，对所有样品的热稳定性、官能团和微观结构进行了分析，并提出了CRMA可能的抗衰老机理。实验结果表明，与未处理的CRMA相比，CRMA活化和CRMA浸泡后的CRMA在老化后具有更显著的粘性行为。老化前后的亚砜指数和羧基指数增量均低于未处理的CRMA。此外，活化CR和浸泡CR均增强了对沥青轻组分的吸附能力，从而提高了其抗老化能力。但crma膨胀的温度敏感性在时效前后下降幅度最大。在老化过程中，沥青轻组分和游离WCO分子都更容易挥发氧化，导致其耐老化性能和低温性能变差。研究结果对CR预处理方法的优化和CRMA的高效清洁应用具有指导意义。

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Aging behavior and microscopic characteristics of modified asphalt using different pretreated crumb rubber

Pretreatment of crumb rubber (CR) can significantly enhance its interfacial compatibility with asphalt and improve the workability of crumb rubber modified asphalt (CRMA). However, the structure and internal composition of pretreated CR are inevitably altered, the difference in aging resistance of CRMA with different pretreated CR need to be systematically studied. In this research, CR was pretreated by microwave activation, waste cooking oil (WCO) swelling and alkali solution soaking respectively, and corresponding modified asphalt namely CRMA-activated, CRMA-swelled and CRMA-soaked were prepared. Then, laboratory thin-film oven test (TFOT) and pressurized aging vessel (PAV) were carried out on different types of binders, the rheological properties of different CRMAs before and after aging were systematically investigated. Afterwards, the thermal stability, functional group and microstructures of all samples were also analyzed, and possible anti-aging mechanism of CRMA was proposed. The experimental results indicate that CRMA-activated and CRMA-soaked have more significant viscous behavior after aging compared with untreated CRMA. Also, the increments of their sulfoxide index and carboxyl index before and after aging are lower than that of untreated CRMA. Moreover, both activated CR and soaked CR enhance the adsorption capacity to the light components of asphalt, and therefore their anti-aging ability are improved. Unfortunately, the temperature sensitivity of CRMA-swelled shows the largest reduction before and after aging. During aging, both the asphalt light components and free WCO molecules are volatilized and oxidized more easily, which causes the deterioration of its aging resistance and low temperature performance. Overall, The findings are instructive for the optimization of CR pretreatment method and high-performance clean application of CRMA.

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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.