原文传递 RHEOLOGICAL AND RHEO-OPTICAL CHARACTERIZATION OF ASPHALT CEMENT AND EVALUATION OF RELAXATION PROPERTIES.
题名: RHEOLOGICAL AND RHEO-OPTICAL CHARACTERIZATION OF ASPHALT CEMENT AND EVALUATION OF RELAXATION PROPERTIES.
作者: Little-DN; Letton-A; Prapnnachari-S; Kim-YR
关键词: ASPHALT-CEMENTS; RHEOLOGICAL-PROPERTIES; RHEO-OPTICAL-TECHNIQUE; MOLECULAR-STRUCTURE; FOURIER-TRANSFORMS; INFRARED-SPECTROSCOPY; SHEAR-DEFORMATION; CHEMICAL-COMPOSITION; VISCOELASTIC-PROPERTIES; X-RAY-ANALYSIS; FRACTAL-ANALYSIS
摘要: The rheological properties of asphalt depend on its molecular structure and chemical composition. The widely used Corbett fractions provide the composition of asphalt but lack the detailed structure/property relationships needed to accurately design asphalt systems. Depending on the proportions of the generic fractions, an asphalt is either a dispersed type or a solution type. The dispersed type is also termed micellar or colloidal; the solution type is termed "polymer type". The literature is unclear as to which structure accurately represents the mechanical behavior of an asphalt system. Material science tools are used to elucidate the structure of asphalt. In particular, a rheo-optical technique was developed and used to probe changes in molecular vibrations via Fourier transform infrared spectroscopy (FTIR) during shear deformation. The objective is to identify the important chemical aspects of an asphalt molecule that are related to the deformation properties of the asphalt. To clarify this relationship, detailed viscoelastic characterization of the asphalt was conducted to ensure an understanding of the asphalt's rheological properties. The FTIR results suggest an important link between rheological performance and linear structures in the asphalt cement complex. This concept was further probed through small-angle X ray scattering. Fractal analysis was used to determine the Porod scattering dimension, which is a measure of the dimensionality of the tested structure (i.e., whether it is linear or branched, or three-dimensionally branched.
总页数: Transportation Research Record. 1994. (1436) pp71-82 (2 Phot., 9 Fig., 4 Tab., 26 Ref.)
报告类型: 科技报告
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