Rate-dependent interfacial adhesive strength and toughness between aggregates and modified asphalt binders in ambient conditions

IF 5.3 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Liquids Pub Date : 2025-04-25 DOI:10.1016/j.molliq.2025.127679

Shuliang Wang , Junjie Zhang , Fan He , Jiehao Feng , Chuanhai Wu , Zhixiang Wang , Fulian Chen , Saleh Alghamdi , Yuanyuan Zheng , Fen Du , Dryver Huston , Mandar Dewoolkar , Ting Tan

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Abstract

Interfacial mechanical behavior was crucial for asphalt mixture performance. This study investigated the rate-dependent interfacial adhesive strength and toughness between aggregates and modified asphalt binders in ambient conditions via combined molecular simulation and experiments. Alumina, silica and calcium carbonate were selected to represent the primary mineral aggregates. Saturate, aromatic, resin and asphaltene were selected to represent the primary components in asphalt binders. Three modifiers, i.e. Styrene-Butadiene-Styrene, Styrene-Butadiene Rubber, and Polyphosphoric Acid, were added into two virgin binders, i.e. PG 64-22 and PG 58-22. Predictions from molecular models were validated by measurements obtained from particle probe scanning force microscopy. It was revealed that adhesion between alumina and binders exceeded the counterparts between silica or calcite and binders of which Van der Waals contributed primarily (>75 %) to aggregate-binder adhesion. Subsequently, aggregate-binder interfaces were probed by molecular electrostatic potentials, diffusion coefficients, radii of gyration, spatial distributions and interfacial morphologies. Furthermore, rate-dependent adhesive strength and toughness were investigated for various aggregate-binder interfaces. The low-speed (<100 m/s), transition (100–300 m/s), and high-speed (>300 m/s) regions were identified from the delamination between aggregates and binders, through which the correlation between interfacial adhesive strength and toughness were established.

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环境条件下集料与改性沥青粘结剂之间速率相关的界面粘结强度和韧性

界面力学性能对沥青混合料的性能至关重要。本研究通过分子模拟和实验相结合的方法研究了环境条件下骨料和改性沥青粘合剂之间的界面粘接强度和韧性的速率依赖性。选择氧化铝、二氧化硅和碳酸钙作为主要矿物团聚体。选择了饱和、芳香、树脂和沥青烯作为沥青结合剂的主要成分。将苯乙烯-丁二烯-苯乙烯、苯乙烯-丁二烯橡胶和聚磷酸三种改性剂分别加入到PG 64-22和PG 58-22两种原生粘结剂中。分子模型的预测被粒子探针扫描力显微镜的测量结果所证实。结果表明，氧化铝与粘结剂之间的附着力超过了二氧化硅或方解石与粘结剂之间的附着力，其中范德华效应主要贡献（> 75%）。随后，通过分子静电势、扩散系数、旋转半径、空间分布和界面形貌来探测聚集体-粘合剂界面。此外，研究了不同集料-粘结剂界面的速率相关的粘接强度和韧性。通过集料与粘结剂之间的分层，确定了低速区（100 m/s）、过渡区（100 - 300 m/s）和高速区（300 m/s），建立了界面粘接强度与韧性之间的相关性。

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来源期刊

Journal of Molecular Liquids 化学-物理：原子、分子和化学物理

CiteScore

10.30

自引率

16.70%

发文量

2597

审稿时长

78 days

期刊介绍： The journal includes papers in the following areas: – Simple organic liquids and mixtures – Ionic liquids – Surfactant solutions (including micelles and vesicles) and liquid interfaces – Colloidal solutions and nanoparticles – Thermotropic and lyotropic liquid crystals – Ferrofluids – Water, aqueous solutions and other hydrogen-bonded liquids – Lubricants, polymer solutions and melts – Molten metals and salts – Phase transitions and critical phenomena in liquids and confined fluids – Self assembly in complex liquids.– Biomolecules in solution The emphasis is on the molecular (or microscopic) understanding of particular liquids or liquid systems, especially concerning structure, dynamics and intermolecular forces. The experimental techniques used may include: – Conventional spectroscopy (mid-IR and far-IR, Raman, NMR, etc.) – Non-linear optics and time resolved spectroscopy (psec, fsec, asec, ISRS, etc.) – Light scattering (Rayleigh, Brillouin, PCS, etc.) – Dielectric relaxation – X-ray and neutron scattering and diffraction. Experimental studies, computer simulations (MD or MC) and analytical theory will be considered for publication; papers just reporting experimental results that do not contribute to the understanding of the fundamentals of molecular and ionic liquids will not be accepted. Only papers of a non-routine nature and advancing the field will be considered for publication.