Relationship of Asphalt Properties to Chemical Constitution

Abstract

Some OF THE most important rheological properties of asphalt depend on chemical constitution. Systmatically reblending chemical type components shows the influence of composition on penetration, softening point, penetration index, viscosity, viscosity-temperature slope, shear susceptibility, and complex stress-strain modulus.A study of the constitution of asphalt in terms of distributions of molecular sizes and definite chemical classes of compounds led to the development of a group of separation procedures (6). These procedures were applied to a representative group of paving asphalts, and the individual fractions have been characterized with regard to molecular weight, hydrocarbon type composition, elemental composition, viscosity, viscosity-temperature slope, and durability(3), The Venezuelan asphalt referred to in that study is the basis for the work reported here.

Network morphology of straight and polymer modified asphalt cements

“…The arrangement and degree of association between asphaltene particles within the oily phase are important since these will ultimately govern the rheological properties of the asphalt cement binder (Heithaus, 1962;Simpson et al, 1961;Whiteoak, 1990). Previous investigations of asphalts and polymer-modified asphalts have used fluorescence microscopy, infrared (IR) spectroscopy, transmission electron microscopy (TEM), gel permeation chromatography (GCP), and mechanical testing to determine the structure, chemistry, stability, and properties changes which occur during processing and aging (Collins et al, 1991;Kraus, 1982;Whiteoak, 1990).…”

“…However, the exact arrangement of the asphaltene particles within the oily phase will vary depending on the relative amounts of resin, asphaltene, and oils. It is this arrangement and the degree of association between asphaltene particles that govern the rheological properties of the cement [Simpson et al (1961) J. Chem. Eng.…”

Current Research and Challenges in Bitumen Emulsion Manufacturing and Its Properties

“…Bitumen is known as a complex material that results from crude oil distillation. Bitumen is used in various construction sectors, mostly as a binder in asphalt pavement [ 4 , 6 , 7 , 8 , 9 ]. Bitumen can be described as a mixture of four broad chemical groups: resins, asphaltenes, aromatics, and saturates.…”

Current Research and Challenges in Bitumen Emulsion Manufacturing and Its Properties

“…Bitumen is known as a complex material that resulted from crude oil distillation. Bitumen is used in various construction sectors and mostly as a binder in asphalt pavement [6], [7] [4], [8], [9]. Bitumen can be described as a mixture of four broad chemical groups resins, asphaltenes, aromatics and saturates.…”